- Msepostdoc-list - ecn.purdue.edu

FW: EVENT: Finish Line Fuel
by Morgan, Yuan-Yu Karen 29 Nov '21

29 Nov '21

Dear Graduate students and Postdocs, Pick up some healthy goodies in the following 2 locations! December 8, 2021 from 9 am - 12 pm in the Birck Lobby December 10, 2021 from 9am - 12 pm in the Forney Atrium Boiler Up, Dr. Morgan [cid:image002.png@01D7E519.12249750]

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REMINDER: Final Exam Seminar, Tuesday, November 30, at 11:30 AM
by Morgan, Yuan-Yu Karen 29 Nov '21

29 Nov '21

From: Msegradstudent-list <msegradstudent-list-bounces(a)ecn.purdue.edu> On Behalf Of Morgan, Yuan-Yu Karen Sent: Tuesday, November 16, 2021 12:53 PM To: msegradstudent-list(a)ecn.purdue.edu; msefaculty-list(a)ecn.purdue.edu; msepostdoc-list(a)ecn.purdue.edu Cc: Ku Blanco, Aury Y <akublanc(a)purdue.edu> Subject: [msegradstudent-list] Final Exam Seminar, Tuesday, November 30, at 11:30 AM Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "The Influence of Print Layer Orientation on the Mechanical Properties of SiC and Cf/SiC CMCs Formed via Direct Ink Writing" By Kyle Cox Purdue MSE M.S. Final Exam Advisors: Professor Rodney Trice and Professor Jeff Youngblood ABSTRACT Silicon carbide is a useful monolithic and matrix ceramic due to its excellent mechanical properties and corrosion/oxidation resistance at high temperature. This makes it an attractive material for use in advanced applications, such as aircraft engines and high-speed flight. In this study, additively manufactured monolithic SiC and Cf/SiC CMCs, processed via direct ink writing (DIW) of a 53 vol% colloidal suspension, achieved >96% theoretical density through pressureless sintering. When present, fibers are aligned in the direction of the print path. Five different print paths were studied, including a 0o path, 90o path, 0/90o path, 0/15/30/45/60/75/90o path, and 0/30/60/90/60/30/0o path. Four-point bend testing was performed to determine flexural strength and Weibull analysis was performed. Strengths were highest for the 0o print path. The characteristic strength, σo, of this print path was 375 MPa with a Weibull modulus of 7.4 for monolithic SiC and a σo of 361 MPa with a Weibull modulus of 10.7 for Cf/SiC. Weibull modulus was greater for Cf/SiC samples compared to identically printed monolithic SiC samples. SEM and optical microscopy were used to analyze printed parts which showed a high degree of fiber alignment in the direction of the print. Fiber pullout was observed on the fracture surface, as well as intragranular fracture. Date: Tuesday, November 30, 2021 Time: 11:30 A.M. Place: by Webex https://purdue.webex.com/meet/rtrice Yuan-Yu Karen Morgan,Ph.D. Academic Advisor-Graduate Program School of Materials Engineering Neil Armstrong Hall of Engineering, Room 2217 765-494-4103 ymorgan(a)purdue.edu<mailto:ymorgan@purdue.edu>

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Final Defense Seminar Thursday, Dec 2, 2 PM
by Morgan, Yuan-Yu Karen 29 Nov '21

29 Nov '21

Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Improving the Mechanical Properties of Cold Spray Metalized Polymers" By Jung-Ting Tsai Purdue MSE Ph.D. Final Exam Advisors: Professor David Bahr and Professor Martin Jun ABSTRACT Cold sprayed metallic coatings on polymers provide the benefits of a non-traditional manufacturing solution. However, the process steps for formulating the coating layer often require trial and error to secure an optimal coating. Many common testing methods for interface adhesion and the coating's mechanical performances only give semi-quantitative measurements. As a result, it's challenging to build the connection between the process-structural relationships of the coated materials. This work established a process simulation framework and created an experimental material characterization method to quantify the mechanical strength of cold spray coatings onto polymer substrates. Particle velocity, mass flow rate, and powder flowability were measured from a low-pressure cold spray system. Increases in mass flow rate are a consequence of good powder flowability. The developed tools and the measurement devices allow quantifying the powder flowability to deposition efficacy in cold spray coatings. Knowing the experimental parameters, we utilized a three-network polymer model based on high strain-rate impact tests to simulate the nonlinear time-dependent response of polymer deformation during the cold spray impact with both rigid and deformable particles. The particle's material properties, velocity, and size were systematically studied to obtain various responses from the finite element analysis of the polymer deformation. The numerical results were mapped into diagrams and validated with the experimental results of cold spraying Cu and Al2O3 powders. The cold spray process controls the adhesion strength between the coating and the substrate but does create a relatively wide distribution of film thickness and properties. Therefore, a mechanical test fixture was built to track electrical conductivity and coating fragmentation during tensile testing of metalized polymers. A modified Weibull model used the crack density, fragment length, and the measured specimens strength/strain to calculate the coated strength distribution at a fixed crack density and the mean strength as a function of fragment length. The specimens coated between 74 μm - 120 μm show an interfacial shear strength between 25 - 53 MPa, while 23 μm - 37 μm show adhesion energy between 2.3-7.9 J/m2. Cold sprayed dual-layer (Sn/Cu), and electroless plated specimens were built successfully using the information from the process simulation model. Cold spray coating increases the engineering performance of the coated substrate. The studies have demonstrated selecting appropriate process parameters for multiple metal/polymer combinations to achieve a successful coating. . Date: Thursday, December 2, 2021 Time: 2:00 P.M. Webex: https://purdue.webex.com/join/dfbahr Yuan-Yu Karen Morgan,Ph.D. Academic Advisor-Graduate Program School of Materials Engineering Neil Armstrong Hall of Engineering, Room 2217 765-494-4103 ymorgan(a)purdue.edu<mailto:ymorgan@purdue.edu>

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MSE 690 Nov 29 Antonia Statt, ARMS 1010, 3:30 PM
by Ku Blanco, Aury Y 23 Nov '21

23 Nov '21

Good morning, Please mark your calendars for next Mon, November 29th at 3:30 PM for Prof. Antonia Statt's<https://matse.illinois.edu/people/profile/statt> (Research group site<https://statt.matse.illinois.edu/>) visit to campus. [cid:image003.jpg@01D7E05F.E73E3E50] Best, Aury Ku she/her/hers Administrative Assistant Materials Engineering Neil Armstrong Hall of Engineering 701 W Stadium Ave, ARMS 2300 West Lafayette, IN 47906 o: 765-494-4100 f: 765-494-1204

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REMINDER: Final Exam Seminar, Monday, November 29, 10 AM
by Morgan, Yuan-Yu Karen 23 Nov '21

23 Nov '21

From: Msegradstudent-list <msegradstudent-list-bounces(a)ecn.purdue.edu> On Behalf Of Morgan, Yuan-Yu Karen Sent: Monday, November 15, 2021 9:26 AM To: msegradstudent-list(a)ecn.purdue.edu; msefaculty-list(a)ecn.purdue.edu; msepostdoc-list(a)ecn.purdue.edu Cc: Ku Blanco, Aury Y <akublanc(a)purdue.edu> Subject: [msegradstudent-list] Final Exam Seminar, Monday, November 29, 10 AM Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Impact of Dynamic Ageing on The Formation and Stability of Model Bilge Water Oil-in-Water Emulsions" By Rina Sabatello Purdue MSE M.S. Final Exam Advisors: Professor Carlos Martinez and Professor John Howarter ABSTRACT Ships, including those in the US Navy, collect oily wastewater in their bilge due to onboard cleaning and mechanical operations. Oil-in-water emulsions (O/W) are present in bilgewater, and their filtration is difficult due to surfactants provided by cleaning products. Despite cleaning efforts, over 457,000 tons of oil are discharged into the ocean every year. An often overlooked aspect of bilgewater emulsions is their evolution, as the ship's movement at sea provides extra energy that can further emulsify the collected oil. This work aims to understand the effects of motion on model bilgewater emulsions by tracking their evolution in dynamic (rocking motion) and static conditions. The model bilgewater emulsion comprises mineral oil, deionized water with 0.42 M NaCl to mimic the salinity of seawater and sodium lauryl ether sulfate and Triton X-100, as commonly found anionic and nonionic surfactants, respectively. A rocker is used to simulate a ship motion; 15 mL of emulsion were placed in 50 mL centrifuge tubes to mimic partially filled bilgewater tanks. Emulsions were characterized via laser diffraction and optical microscopy. Model bilgewater emulsions with either SLES or Triton X-100 at concentrations above 100 ppm and 500 ppm, respectively, show long-term stability in static (no-rocking) conditions up to 20 days of observation. These concentrations represent the minimum surfactant concentration needed to obtain stable emulsions under static conditions. Under dynamic conditions, the minimum surfactant concentration to obtain stable emulsions increases to 500 ppm and 1000 ppm for SLES and Triton X-100, respectively. These results mean that the ship motion can induce drop coalescence in unstable emulsions with lower surfactant concentrations. However, the drop size distributions for stable emulsions under dynamic conditions show further emulsification as the average drop size decreases. The ship motion can help further reduce the size of the emulsion drops to diameters < 2.8 µm, which are significantly harder to filter out using current methods. A bilgewater tank partially filled will likely show a higher amount of sloshing than a filled one. To understand the effects of bilgewater storage volume on emulsification, a series of dynamic experiments were carried out with samples that contained up to 100% of the centrifuge tube volume occupied by the model bilge water emulsion. Even when 100% of the centrifuge volume is occupied and sloshing is eliminated, the oil moves due to density differences, and the shear stress between fluids can induce the generation of drops < 2.8 µm. In summary, this work shows that the ship motion provides enough energy for emulsification once a minimum surfactant concentration is reached regardless of the volume of emulsion stored in the tanks. The data suggests that the best way to mitigate stable bilgewater emulsion formation is by reducing surfactant concentration Date: Monday, Nov 29, 2021 Time: 10:00 A.M. Place:https://purdueedu.zoom.us/j/97465163370?pwd=cW1JdFBCdE9maTRmN3ZJMUZHWmxsQT09 Yuan-Yu Karen Morgan,Ph.D. Academic Advisor-Graduate Program School of Materials Engineering Neil Armstrong Hall of Engineering, Room 2217 765-494-4103 ymorgan(a)purdue.edu<mailto:ymorgan@purdue.edu>

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Preliminary Exam Seminar, Wednesday, December 8, 11 AM
by Morgan, Yuan-Yu Karen 23 Nov '21

23 Nov '21

Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Surface Precipitation and Growth of Bismuth Particles in Sn-Ag-Cu Solder Joints" By John Wu Purdue MSE Preliminary Exam Advisor: Professor Nikhilesh Chawla ABSTRACT Since the widespread use of Pb-free solders, many different types of elements have been added into solders to form alloys of ideal mechanical behavior. Alloying Bismuth (Bi) to the commonly seen Tin-Silver-Copper (SAC) solder systems have been especially of interest, as the addition of Bi is able to improve the overall mechanical properties and lower the melting point for more flexible assembly processes. It has been previously reported that low amounts of bismuth added to SAC305 solders would result in a precipitation effect on the polished surface. However, the growth rate and mechanisms of these precipitates at the early stages of surface exposure have not been carefully observed. The approach in attempt to explain early stage bismuth precipitation was achieved by re-polishing already precipitated surfaces. The act of re-exposure and resetting the precipitation cycle allowed calculation of precipitate growth. The results of precipitate size relation to time indicated that precipitation was strongly driven by surface diffusion. A parametric correlation between growth rate and growth mechanism is presented. Date: Wednesday, December 8, 2021 Time: 11:00 AM Place: https://purdue.webex.com/meet/nikc Yuan-Yu Karen Morgan,Ph.D. Academic Advisor-Graduate Program School of Materials Engineering Neil Armstrong Hall of Engineering, Room 2217 765-494-4103 ymorgan(a)purdue.edu<mailto:ymorgan@purdue.edu>

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Preliminary Exam Seminar, Thursday, December 9, 9 AM
by Morgan, Yuan-Yu Karen 23 Nov '21

23 Nov '21

Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Reliability of Recycled Carbon Fiber Reinforced Polymers (rCFRPs) for Sustainable High-Volume Composites" By Morgan Chamberlain Purdue MSE Preliminary Exam Advisor: Professor Jan-Anders Mansson ABSTRACT The high performance and lightweighting advantages of carbon fiber reinforced polymer composites (CFRPs) have become integral within industries such as aerospace, automotive, and sporting goods. However, the growing demand for CFRPs is met with an equally pressing need for sustainable alternatives to the harsh environmental impact that virgin carbon fiber (vCF) manufacturing entails. Additionally, the upcoming end of service life for thousands of aircraft that were manufactured at the forefront of CFRP technology will provide an additional 196,000 tons of carbon fiber waste by 2025, compared to the average 94,000 tons that is already landfilled annually. Hence there is a considerable need to bring recycled carbon fiber reinforced polymers (rCFRPs) into high-volume composites manufacturing as a sustainable alternative to landfill disposal of CFRP waste. This review analyzes the development of carbon fiber recycling technologies, as well as the more recent progress in manufacturing with the recycled material. Challenges are presented that currently hinder the scalability of rCFRPs at high volumes, including fiber surface defects and variability in length retention. Despite the difficulties that these complexities introduce, recycled carbon fiber (rCF) has shown to have excellent retention of mechanical properties, conditional on the optimization of the recycling process. Hence additional research is needed to improve rCFRP processing and assess the reliability of rCFRP structures. The final portion of this work analyzes how the Weibull distribution function can address these gaps by providing a statistical analysis of the mechanical reliability of recycled materials. In this context, understanding the complexity of the current state of recycled carbon fiber, and the difficulties in manufacturability that come with its many forms, is paramount in advancing processing technologies and broadening applications of rCFRPs. Date: Thursday, December 9, 2021 Time: 9:00 AM Place: Webex--https://purdue.webex.com/meet/jmansson Yuan-Yu Karen Morgan,Ph.D. Academic Advisor-Graduate Program School of Materials Engineering Neil Armstrong Hall of Engineering, Room 2217 765-494-4103 ymorgan(a)purdue.edu<mailto:ymorgan@purdue.edu>

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Preliminary Exam Seminar, December 6, Monday, 9:30 AM
by Morgan, Yuan-Yu Karen 22 Nov '21

22 Nov '21

Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Polymer Infiltration and Pyrolysis Processing of Carbon/Carbon Composites" By Edwin Romero Purdue MSE Preliminary Exam Advisor: Professor Rodney Trice ABSTRACT The low density and high thermostability of bulk carbon make carbon fiber-reinforced carbon matrix composites a good candidate for hypersonic applications. To obtain a pure carbon matrix, a polymer matrix composite is thermally decomposed in an oxygen-free atmosphere, resulting in weight loss and a porous matrix structure. The thermomechanical properties of the porous composite can be improved using polymer infiltration and pyrolysis (PIP) processing, where infiltration and conversion of a secondary polymer causes a carbon build-up on pore walls. This simultaneously decreases the total pore volume and increases the carbon matrix density, but since a portion of the secondary polymer is gasified, some residual porosity is left behind. As a result, several cycles of PIP are needed to obtain bulk densities >90%. This review focuses on some aspects of infiltration for carbon/carbon composites that have been used to reduce densification cycles. Date: December 6, 2021 Time: 9:30 AM Place: https://purdue.webex.com/meet/rtrice Yuan-Yu Karen Morgan,Ph.D. Academic Advisor-Graduate Program School of Materials Engineering Neil Armstrong Hall of Engineering, Room 2217 765-494-4103 ymorgan(a)purdue.edu<mailto:ymorgan@purdue.edu>

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Fw: Freiser Lecture, Tuesday, Nov 30, 2021
by Son, Rosemary E 22 Nov '21

22 Nov '21

________________________________ From: Hanna, Thomas J <hanna9(a)purdue.edu> Sent: Monday, November 22, 2021 10:15 AM To: Mechanical Engineering Graduate Office <megradoffice(a)purdue.edu>; Elwell, Cathy L <celwell(a)purdue.edu>; Golden, Matt <goldenm(a)purdue.edu>; Ricksy, Jennifer R <jricksy(a)purdue.edu>; Zimmerman, Nicole K <nzimmerm(a)purdue.edu>; Son, Rosemary E <son39(a)purdue.edu>; Johnson, Beverly J <bevjohnson(a)purdue.edu>; Delaney, Morgan J <mdelane(a)purdue.edu> Subject: Freiser Lecture, Tuesday, Nov 30, 2021 Please distribute the attached Brochure for the Chemistry Virtual Freiser Lecture, Nov 30, 2021 to your respective areas. Thank you, Tom Hanna Administrative Assistant to: Analytical Division of Chemistry Professors Claridge, Kenttämaa, A. Laskin, J. Laskin, McLuckey, Simpson, Wirth, C. Zhang Organic Division of Chemistry Professors Axelrod, Chmielewski, Lipton, Mao, Mei, Sintim Department of Chemistry BRWN 5171A Purdue University 560 Oval Drive West Lafayette, IN 47907-2084 hanna9(a)purdue.edu<mailto:hanna9@purdue.edu> 765-494-5267

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Reminder: Final Exam Seminar of John Obamedo, Nov. 22, Monday at 2 pm
by Morgan, Yuan-Yu Karen 22 Nov '21

22 Nov '21

Reminder: MATERIALS ENGINEERING SEMINAR "Compositional Effect on Low-Temperature Transient Liquid Phase Sintering of Tin Indium Solder Paste" By John Obamedo Purdue MSE M.S. Final Exam Advisors: Professor Carol Handwerker and Professor John Blendell ABSTRACT Transient liquid phase sintering (TLPS) technologies are potential low-temperature solders for sustainable replacements of lead-based solders and high-temperature lead-free solders. Compared to solid-state sintering and lead-free solders, TLPS uses lower temperatures and is, thus, suitable for assembling temperature-sensitive components. TLPS is a non-equilibrium process and determining the kinetics is critical to the estimation of processing times needed for good joining. The tin-indium (Sn-In) system with a eutectic temperature of 119°C is being considered as the basis for a TLPS system when combined with tin. Most models of TLPS include interdiffusion, dissolution, isothermal solidification, and homogenization and are based on simple binary alloys without intermediate phases. The Sn-In system has two intermediate phases and thus the reaction kinetics require additional terms in the modeling. Differential Scanning Calorimetry (DSC) has been used to measure the response of Sn-In alloys during the transient liquid phase reaction. Preparation of tin indium alloys for microstructural analysis is challenging due to their very low hardness. This study uses freeze-fracturing of the tin indium alloys to obtain sections for microstructural analysis. The combination of DSC and microstructure analysis provides information on the reaction kinetics. It was observed that the solid/liquid reaction does not proceed as quickly as desired, that is, substantial liquid remains after annealing even though the overall composition is in the single-phase region in the phase diagram. Date: Monday, Nov 22, 2021 Time: 2:00 P.M. Place: HAMP 2101

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