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Seminar Notice for Elizabeth Laskowski's Preliminary Exam. Monday, Dec. 2, at 11:00 a.m., in ARMS 1028 “High Temperature Dissolution Kinetics of Solids in Molten Chloride Salts”
by Son, Rosemary E 26 Nov '19

26 Nov '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR “High Temperature Dissolution Kinetics of Solids in Molten Chloride Salts” By Elizabeth A. Laskowski Purdue MSE Preliminary Exam Advisor: Professor Kenneth H. Sandhage ABSTRACT Chloride based molten salts are of growing interest as heat transfer fluids and thermal energy storage media for concentrated solar power and as solvent baths for spent nuclear fuel processing and precious metal recovery. Sea-derived salts are especially attractive as they offer low cost, abundance, and nontoxic waste in addition to high temperature stability (>650C), low viscosity, and high heat capacity. As new engineering solutions seek to utilize molten chlorides, a significant barrier is finding cost-effective materials that can contain the hot fluids over extended service times due to the corrosive nature of the salts. Sparse literature deeply explores the corrosion kinetics observed for these fluids and generally kinetic assumptions are oversimplified and based purely on static corrosion tests. Literature exploring the kinetics of dissolution in molten oxides lends established models to describe the dissolution behavior observed in molten chloride studies. Understanding the kinetics of material dissolution in these salts will serve new material development to meet the demands of applications. Date: Monday, December 2, 2019 Time: 11:00 A.M. Place: ARMS 1028

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Seminar Reminder for Ziyun Huang's Preliminary Exam, Wednesday, Nov. 27, at 1:00, in ARMS 1021 " Thermodynamically-driven Massive Spalling in Solder Joints"
by Son, Rosemary E 26 Nov '19

26 Nov '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Thermodynamically-driven Massive Spalling in Solder Joints" By Ziyun Huang Purdue MSE Preliminary Exam Advisors: Professor Carol A. Handwerker and Professor John E. Blendell ABSTRACT Solder joint plays an important role in present packaging industry and has a great impact on overall reliability property of chips. This review will mainly focus on massive spalling phenomenon in solders and its thermodynamic driving force. The necessary condition for spalling to happen is that at least one of the active components has limited amount, and local equilibrium changes as the reactive constituent is consumed. Specifically, massive spalling results from two mechanism (1) grain boundary penetration and (2) microvoids aggregation. Both high-lead and lead-free solders will be considered due to environmental concern of lead. For each case, industrial methods to inhibit massive spalling have been discussed. However, increased interfacial energy as a consequence of spalling has never been directly proved, and more experiments are needed to further understand this problem. Date: Wednesday, November 27, 2019 Time: 1:00 P.M. Place: ARMS 1021

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MSE Safety & Equipment Newsletter for November/December 2019
by Erk, Kendra A 25 Nov '19

25 Nov '19

PDF of newsletter available here: https://engineering.purdue.edu/Intranet/Groups/Schools/MSE/Facilities/Safet… MSE Safety & Equipment Newsletter for November/December 2019 **** Important Upcoming Dates **** · Purdue Winter Recess, Dec. 23 through Jan. 1. Exercise caution when working in the lab during the recess as few (if any) personnel will be on campus to provide assistance. **** MSE Lab Safety Blackboard Course Updates **** · Guidance and links for Accident & Near-Miss reporting Reminder: To self-enroll in this Blackboard course, click here<https://mycourses.purdue.edu/webapps/blackboard/execute/viewCatalog?id=&typ…> . **** Annual Safety Training Reminder **** As described in the MSE safety training policy (posted here<https://engineering.purdue.edu/Intranet/Groups/Schools/MSE/Facilities/Safet…>), each academic year, all undergraduate students, graduate students, and postdoctoral researchers are required to complete the MSE-specific safety training (slides & quiz) administered through Blackboard. A list of researchers who have/have not completed the training will be provided to Prof. Bahr and MSE faculty members at the end of the semester. **** PPE Reminder **** Physical and health hazards and the required PPE for each MSE lab space are posted on the lab’s main door. Required PPE typically includes impact-resistant safety glasses, long pants, closed-toed shoes, and, for CHP labs, a lab coat. To encourage PPE use, a “three-strike” infraction policy has been adopted, described below. For example, an infraction could be not wearing safety glasses in a lab space where safety glasses are required. · First infraction: warning email with supervisor copied · Second infraction: lab access temporarily suspended · Third infraction: lab access permanently suspended **** XRD Lab Clean-Up **** Prof. Blendell and the Equipment Committee will be removing two old XRDs and other related equipment in the XRD lab (ARMS 2093). During this process, Prof. Blendell will label equipment, components, and other things as “to-go” by Monday, Dec 2nd. These items will then be sent to surplus or thrown away. Contact Prof. Blendell<mailto:blendell@purdue.edu> to inquire about specific items. **** Mechanical Testing Equipment Update**** If you wish to use any of the following equipment, please make sure you receive training from Jenni Fifer<mailto:fiferj@purdue.edu> if you are not already trained; and please schedule your time with the equipment using the following Google Calendars: · Charpy Impact Test<https://calendar.google.com/calendar?cid=NzJ2YW9nMHJlNGljamtsdWo4bGNpN3U2cj…> (ARMS 2191) · ADMET Load Frame 1<https://calendar.google.com/calendar?cid=NDAya2ZzbHVsbW5qa3VjbmpsZWk0OHIzZ3…> (ARMS 2191) and ADMET Load Frame 2<https://calendar.google.com/calendar?cid=cnBmZWRjaTBlM2dzY2E2cGY0MmtzNGQzb2…> (ARMS 2191) · Sintech Load Frame<https://calendar.google.com/calendar/b/1?cid=djBuN3Q3cjd2djhtbHI4NXJsbmFnbj…> (ARMS B146) · Vickers Microhardness<https://calendar.google.com/calendar/b/1?cid=cGFpZ2VzMTQ5OUBnbWFpbC5jb20> (ARMS 2130) · MTS Load Frame<https://calendar.google.com/calendar/r/settings/calendar/aGNzY21lZGRxNHAwdD…> (ARMS B146) - must be trained before accessing this calendar. **** Equipment Reporting Reminder **** If you encounter a piece of broken equipment, or have any questions about a specific piece of equipment, you should contact a member of the MSE Technical Staff: · For general equipment (and associated checklists): Tim VanMeter<mailto:tcvanmet@purdue.edu>, Darren Pauly<mailto:dpauly@purdue.edu> · For mechanical testing equipment: Jenni Fifer<mailto:fiferj@purdue.edu> · For analytical (iLab) equipment: Talukder Alam<mailto:alam18@purdue.edu> **** Important Links and Contact Information **** · For general safety questions, concerns, and lab access issues: mse-safety(a)purdue.edu<mailto:mse-safety@purdue.edu> or speak directly to MSE Safety Officer Jenni Fifer<mailto:fiferj@purdue.edu> (ARMS 2207) · For iLab equipment training and issues: Talukder Alam<mailto:alam18@purdue.edu> (ARMS 2207) · Equipment/Safety/Consumables Reporting Form<https://purdue.ca1.qualtrics.com/jfe/form/SV_7QcGyO9IVMwWRPD?_ga=2.24554381…> · Purdue REM Researcher’s Guide<https://www.purdue.edu/ehps/rem/laboratory/researchers.html#cs2> (all new researchers should check this out...) · ARMS general safety information<https://engineering.purdue.edu/Intranet/Groups/Facilities/ArmstrongHall> Thanks for reading everyone and have a GREAT holiday season!   Prof. Erk and the MSE Safety Committee 

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Seminar Reminder for Lorena Alzate Vargas's Ph.D. Final Exam. Monday, Nov. 25, 2019, at 11:00 a.m., in HAMP 2117. "Structural Properties and Local Chain Dynamics of Polymeric Materials Using Molecular Dynamics"
by Son, Rosemary E 22 Nov '19

22 Nov '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Structural Properties and Local Chain Dynamics of Polymeric Materials Using Molecular Dynamics" By L. Lorena Alzate Vargas Purdue MSE Ph.D. Final Exam Advisor: Professor Alejandro Strachan ABSTRACT The use of atomistic level simulations like molecular dynamics are becoming a key part in the process of materials discovery, optimization and development since they can provide complete description of a material and contribute to understand the response of materials under certain conditions or to elucidate the mechanisms involved in the materials behavior. We will discuss to cases in which molecular dynamics simulations are used to characterize and understand the behavior of materials: i) prediction of properties of small organic crystals in order to be implemented in a multiscale modeling framework which objective is to predict mechanically induced amorphization without experimental input other than the molecular structure and ii) characterization of temperature dependent spatio-temporal domains of high mobility torsions in several bulk polymers, thin slab and isolated chains; strikingly we observe universality in the percolation of these domains across the glass transition. However, as in any model, validation of the predicted results against appropriate experiments is a critical stage, especially if the predicted results are to be used in decision making. Various sources of uncertainties alter both modeling and experimental results and therefore the validation process. We will present molecular dynamics simulations to assess uncertainties associated with the prediction of several important properties of thermoplastic polymers; in which we independently quantify how the predictions are affected by several sources. Interestingly, we find that all sources of uncertainties studied influence predictions, but their relative importance depends on the specific quantity of interest. Date: Monday, November 25, 2019 Time: 11:00 A.M. Place: HAMP 2117

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MSE 690 Beth Holloway 11-22, 3:30 PM, ARMS 1010
by Ku Blanco, Aury Y 22 Nov '19

22 Nov '19

Hi all, Forwarding on behalf of Jessica Sargent + MSEGSA, please plan to attend: [cid:image004.jpg@01D59BA9.8D617390] Grad Students, if you are interested in joining Dr. Holloway for lunch next Friday- please reach out to me for more information. Thank you, Aury Ku Administrative Assistant Purdue University School of Materials Engineering Neil Armstrong Hall of Engineering 765/494-4100 akublanc(a)purdue.edu<mailto:staceyl@purdue.edu> [https://www.purdue.edu/brand/images/Purdue_University-150_Years_of_Giant_Le…]

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Seminar Notice for Elizabeth Laskowski's Prelim. Monday, Dec. 2 at 11:00 a.m., in ARMS 1028. Review same day, at 12:00, in ARMS 2237. Exam, at 12:30, in ARMS 2237 " High Temperature Dissolution Kinetics of Solids in Molten Chloride Salts"
by Son, Rosemary E 21 Nov '19

21 Nov '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "High Temperature Dissolution Kinetics of Solids in Molten Chloride Salts" By Elizabeth A. Laskowski Purdue MSE Preliminary Exam Advisor: Professor Kenneth H. Sandhage ABSTRACT Chloride based molten salts are of growing interest as heat transfer fluids and thermal energy storage media for concentrated solar power and as solvent baths for spent nuclear fuel processing and precious metal recovery. Sea-derived salts are especially attractive as they offer low cost, abundance, and nontoxic waste in addition to high temperature stability (>650C), low viscosity, and high heat capacity. As new engineering solutions seek to utilize molten chlorides, a significant barrier is finding cost-effective materials that can contain the hot fluids over extended service times due to the corrosive nature of the salts. Sparse literature deeply explores the corrosion kinetics observed for these fluids and generally kinetic assumptions are oversimplified and based purely on static corrosion tests. Literature exploring the kinetics of dissolution in molten oxides lends established models to describe the dissolution behavior observed in molten chloride studies. Understanding the kinetics of material dissolution in these salts will serve new material development to meet the demands of applications. Date: Monday, December 2, 2019 Time: 11:00 A.M. Place: ARMS 1028 School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering 701 West Stadium Ave. Room 2200 West Lafayette, IN 47907 765-494-4105 [PU150]

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Seminar Reminder for R. G. Sreekar Annadanam's Preliminary Exam. Seminar Thursday, Nov. 21, 8:00 a.m., in ARMS 1103. "Void Formation and Evolution in Irradiated Metals Studied by Phase-Field Approach"
by Son, Rosemary E 20 Nov '19

20 Nov '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Void Formation and Evolution in Irradiated Metals Studied by Phase-Field Approach" By Rayaprolu Goutham Sreekar Annadanam Purdue MSE Preliminary Exam Advisor: Professor Anter El-Azab ABSTRACT The safe and efficient operation of nuclear reactors requires the structural materials to be stable chemically, microstructurally and dimensionally under energetic particle irradiation. An ubiquitous phenomenon that occurs in many structural alloys in nuclear reactors is volumetric swelling. This phenomenon is primarily attributed to the nucleation and growth of voids and bubbles filled with transmutation gases such as helium . Early attempts to model this phenomenon involved the use of the classical nucleation theory and reaction rate theory models to capture the nucleation and growth kinetics, respectively, and correlate the observed effects with the irradiation dose rate and temperature. However, these models suffered certain limitations associated with the requirement of homogeneity of the irradiated material and defect fields, and were thus not adequately reliable in explaining the experimental results and in making predictions. Relatively recently, the phase field approach was introduced with the goal to capture the concurrent nucleation and growth of voids and bubbles under the condition of dynamic point defect production by atomic collision cascades in irradiation environments. Of particular interest in this study are the phase field models for void nucleation and growth. In the literature, these models can be primarily classified into two types, those based upon Cahn-Hilliard type equations and others based upon combined Cahn-Hilliard and Allen-Cahn equations. While these models have been well tested, they are not able to provide quantitative predictions yet due to the yet-to-be completed theoretical underpinning of the phase field model parameters, especially the Allen-Cahn mobility. Such parameters require matching with the so-called sharp interface models, which represent the physics of void growth better. In addition to fixing the phase field model parameters, such a matching is also required to guarantee physical and thermodynamic consistency of the phase field approach. In this paper, I review the existing phase field models and discuss further steps to make the phase field consistent with sharp interface theory. Date: Thursday, November 21, 2019 Time: 8:00 A.M. Place: ARMS 1103

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Seminar Reminder for Yash Pachaury's Preliminary Exam. Tuesday, Nov. 19, at 8:00 a.m., in ARMS 1021. "A Survey on Microstructure Analysis and Synthesis using Statistical Techniques
by Son, Rosemary E 18 Nov '19

18 Nov '19

Please consider attending the following tomorrow morning at 8:00 a.m. MATERIALS ENGINEERING SEMINAR "A Survey on Microstructure Analysis and Synthesis using Statistical Techniques" By Yash Pachaury Purdue MSE Preliminary Exam Advisor: Professor Anter El-Azab ABSTRACT Microstructure analysis and synthesis forms an essential part of establishing structure-property relationships of materials. Correlations between the different microstructural features, such as grain boundaries, inclusions and other defects, and the physical behavior of materials can reveal insights into the underlying mechanisms responsible for their observed behavior. For developing high fidelity computational tools, it becomes essential to extract different microstructural characteristics for studying the behavior of materials at different length and time scales. These microstructure characteristics can be utilized to reconstruct virtual microstructures to be used as an input to develop accurate microstructure dependent numerical models. This paper provides a review of different statistical techniques of microstructure analysis and synthesis to determine effective properties of multiphase materials and resolve microstructure dependent fields by explicitly introducing these features from experimental measurements into predictive models. This review provides an understanding of the microstructure correlation functions and the different paradigms such as phase recovery, simulated annealing and Markov random field-based approaches, which use these microstructural descriptors to reconstruct virtual microstructures to model the physical behavior of materials, including their effective structural response. Some areas of future research have been determined based on a critical assessment of different techniques. Date: Tuesday, November 19, 2019 Time: 8:00 A.M. Place: ARMS 1021

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Seminar Notice for Ziyun Huang's Preliminary Exam, Wednesday, Nov. 27, at 1:00, in ARMS 1021 " Thermodynamically-driven Massive Spalling in Solder Joints"
by Son, Rosemary E 18 Nov '19

18 Nov '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Thermodynamically-driven Massive Spalling in Solder Joints" By Ziyun Huang Purdue MSE Preliminary Exam Advisors: Professor Carol A. Handwerker and Professor John E. Blendell ABSTRACT Solder joint plays an important role in present packaging industry and has a great impact on overall reliability property of chips. This review will mainly focus on massive spalling phenomenon in solders and its thermodynamic driving force. The necessary condition for spalling to happen is that at least one of the active components has limited amount, and local equilibrium changes as the reactive constituent is consumed. Specifically, massive spalling results from two mechanism (1) grain boundary penetration and (2) microvoids aggregation. Both high-lead and lead-free solders will be considered due to environmental concern of lead. For each case, industrial methods to inhibit massive spalling have been discussed. However, increased interfacial energy as a consequence of spalling has never been directly proved, and more experiments are needed to further understand this problem. Date: Wednesday, November 27, 2019 Time: 1:00 P.M. Place: ARMS 1021

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Seminar Notice for Lorena Alzate Vargas's Ph.D. Final Exam. Monday, Nov. 25, 2019, at 11:00 a.m., in HAMP 2117. "Structural Properties and Local Chain Dynamics of Polymeric Materials Using Molecular Dynamics"
by Son, Rosemary E 18 Nov '19

18 Nov '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Structural Properties and Local Chain Dynamics of Polymeric Materials Using Molecular Dynamics" By L. Lorena Alzate Vargas Purdue MSE Ph.D. Final Exam Advisor: Professor Alejandro Strachan ABSTRACT The use of atomistic level simulations like molecular dynamics are becoming a key part in the process of materials discovery, optimization and development since they can provide complete description of a material and contribute to understand the response of materials under certain conditions or to elucidate the mechanisms involved in the materials behavior. We will discuss to cases in which molecular dynamics simulations are used to characterize and understand the behavior of materials: i) prediction of properties of small organic crystals in order to be implemented in a multiscale modeling framework which objective is to predict mechanically induced amorphization without experimental input other than the molecular structure and ii) characterization of temperature dependent spatio-temporal domains of high mobility torsions in several bulk polymers, thin slab and isolated chains; strikingly we observe universality in the percolation of these domains across the glass transition. However, as in any model, validation of the predicted results against appropriate experiments is a critical stage, especially if the predicted results are to be used in decision making. Various sources of uncertainties alter both modeling and experimental results and therefore the validation process. We will present molecular dynamics simulations to assess uncertainties associated with the prediction of several important properties of thermoplastic polymers; in which we independently quantify how the predictions are affected by several sources. Interestingly, we find that all sources of uncertainties studied influence predictions, but their relative importance depends on the specific quantity of interest. Date: Monday, November 25, 2019 Time: 11:00 A.M. Place: HAMP 2117

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