May 2019 - Msepostdoc-list

Seminar Notice for Sabrina Huang's Ph.D. Final Exam Tuesday, June 4, at 9:00 a.m., in ARMS 1028. Exam same day at 10:00, in ARMS 2326 "Investigation of Biodegradable Iron-Manganese Alloys with Various Porosity"
by Son, Rosemary E 21 May '19

21 May '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Investigation of Biodegradable Iron-Manganese Alloys with Various Porosity" By Sabrina M. Huang Purdue MSE Ph.D. Final Exam Advisor: Professor Lia Stanciu ABSTRACT Bioresorbable iron-manganese (Fe-Mn) alloys are considered as a new class of biomaterials for the development of temporary orthopedic fixation devices due to their promising mechanical properties and the ability to degrade in the physiological environment. These materials release small quantities of metallic ions/particles that are absorbable by the host upon their biodegradation. The greatest challenge for developing an ideal resorbable Fe-Mn alloy is to increase the degradation rate of the alloy while maintaining biocompatibility, i.e. causing zero or minimal local and systemic toxicity to the tissue. Another challenge is to improve osteo-integration through inducing a cascade of events leading to tissue ingrowth. The focus of this presentation is on balancing all of these requirements by introducing porosity for increased biodegradation and collagen type I coatings for osteo-integration. The microstructure and mechanical properties of the alloys, as well as the influence of the degree of porosity on the corrosion rates in relation to the concentrations of released metal ions were investigated. We also present on the effect of Type I Collagen coating on cellular compatibility and corrosion rates. With the incorporation of porosity and surface coating with Type I collagen, Fe-30Mn alloys could become the next generation transient fracture fixation medical devices. Date: Tuesday, June 4, 2019 Time: 9:00 A.M. Place: ARMS 1028

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Seminar Notice for Han Wang's Ph.D. Final. Monday, at 1:00, in ARMS 1028. Exam same day, at 2:00, in ARMS 2237. "Strain-Engineered Bismuth-Based Oxide Thin Films for Multifunctionalities"
by Son, Rosemary E 21 May '19

21 May '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Strain-Engineered Bismuth-Based Oxide Thin Films for Multifunctionalities" By Han Wang Purdue MSE Ph.D. Final Exam Advisor: Professor Haiyan Wang ABSTRACT Multifunctional characteristics of Bismuth-based oxides offer great opportunities to design a variety of devices exploiting either a single functionality or the synergistic multifunctionalities. In the past decades, strain engineering of thin films arose as a solution for fabrication of novel structures with highly desired properties. In this thesis, strain engineering has been applied to Bismuth-based oxides to explore the strain effect on thin film structures and functionalities. BiFeO3 (BFO) servers as the first study platform, because of its strain-induced phase transition and the corresponding diverse polarization properties. The strain effect of SrRuO3 (SRO)-buffered substrates on ferroelectric and optical properties of BFO thin films has been investigated. A wide range of strain states have been achieved in BFO films. The ferroelectricity and bandgap have been effectively tuned even with partial strain relaxation. However, pure BFO suffers from high leakage current and large coercive field. To overcome these limitations, Sm-doped BFO (BSFO) systems emerged and has been used in controlling the microstructure and properties of BFO. Our detailed structure analysis proves the Sm doping amount in BSFO thin films can be tuned effectively via deposition temperature. Consequently, the Sm dopant influences phase formation of BSFO and the macroscopic ferroelectric properties. Another member in Bismuth-based oxide family, Bi2WO6 (BWO), has been selected as the base material for the design of the two-phase nanocomposites, because of its unique layered structure and ferroelectric property. To introduce ferromagnetic component into BWO, two methods have been explored. The first method incorporates Mn cations into the BWO matrix (BWMO), and the second method couples CoFe2O4 (CFO) as secondary phase with BWO to form a vertically aligned nanocomposite (VAN) system. Both systems exhibit robust ferromagnetic and ferroelectric response at room temperature and demonstrate their promise as room temperature multiferroics for future spintronics and memory applications. Date: Monday, June 3, 2019 Time: 1:000 P.M. Place: ARMS 1028

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Seminar Notice for Oiang Li's Ph.D. Final Exam. Seminar, Monday, June 3, at 9:00 a.m., in ARMS 1028. " Fabrication, Plasticity, and Thermal Stability of Nanotwinned Al Alloys"
by Son, Rosemary E 20 May '19

20 May '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Fabrication, Plasticity, and Thermal Stability of Nanotwinned Al Alloys" By Qiang Li Purdue MSE Ph.D. Final Exam Advisor: Professor Xinghang Zhang ABSTRACT Lightweight Al alloys have widespread applications in transportation industry. Applications of Al alloys in harsh environments involving high stress and high temperatures are often hindered because of their inherently low strength and poor performance at high temperatures. The strongest commercial Al alloys have a maximum strength less than 700 MPa. Although ultrafine grained Al alloys prepared by severe plastic deformation have higher strength, they encounter grain growth at moderate temperatures (less than 200 °C). This thesis focuses on adopting transition metal solutes and non-equilibrium approach to fabricate high-strength, thermally stable nanotwinned Al alloys. To understand the underlying deformation mechanisms of nanotwinned Al alloys, in-situ micromechanical tests, high resolution and analytical transmission microscopy and atomistic simulations were used. Our studies show that nanotwinned supersaturated Al-Fe alloys have a maximum hardness and flow stress of ~ 5.5 GPa and 1.6 GPa, respectively. The apparent directionality of the vertical incoherent twin boundaries renders plastic anisotropy and compression-tension asymmetry in the nanotwinned Al-Fe alloys, revealed by systematic in-situ tensile and compressive micromechanical experiments conducted from both in-plane and out-of-plane directions. Moreover, the nanotwinned Al-Fe alloys experience no apparent softening when tested at 200 °C. When selectively incorporating with one additional solute as stabilizer, the ternary nanotwinned Al alloys can preserve an exceptionally high flow stress, exceeding 2 GPa, prior to precipitous softening at an annealing temperature of > 400 °C. The thesis offers a new perspective to the design of future strong, deformable and thermally stable nanostructured Al alloys. Date: Monday, June 3, 2019 Time: 9:00 A.M. Place: ARMS 1028

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Gas Cylinders
by Coar, Stacey L 20 May '19

20 May '19

All, Our building deputy is reporting that the cylinder cage is getting over-filled. Once the cages are full, aside from being extra difficult to get cylinders in the back, ARMS can no longer accept cylinder deliveries. If you have ordered gas tanks in the last couple months, but not picked them up, please do so asap. Thanks, Jameson

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Spring cleaning and taking it to salvage 5/23
by Coar, Stacey L 16 May '19

16 May '19

Good morning, Tim and I have decided to do a little Spring cleaning and will be collecting items to go to salvage. We are putting all items in the Optical Lab and would like to have anything going by next Thursday, May 23rd. If you have computer equipment, lab items, etc. that need to go and need help, please make arrangements with Tim or myself. Thank you, Stacey Stacey Coar Secretary/Development Assistant School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering 701 West Stadium Ave. Room 2300 West Lafayette, IN 47907 765-494-4100 scoar(a)purdue.edu<mailto:scoar@purdue.edu>

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MSE/ARMS Floor Scrubbing/Waxing This week
by Stacey, Lisa A 14 May '19

14 May '19

The floors in specific ARMS/MSE areas will be scrubbed and waxed this week as follows (rooms affected will be closed 4 pm to 11 pm each day): Tue. 5/14: ARMS 2nd Floor Men's Rest Room - main hall, not AAE Wed. 5/15: ARMS 2314 - MSE Kitchen/Break area Thur. 5/16: ARMS 2312 & 2312A - MSE Copier/Supplies/Back Storage areas Thank you for your flexibility. Lisa Stacey Administrative Assistant to Department Head Purdue University School of Materials Engineering Neil Armstrong Hall of Engineering 765/494-4095 staceyl(a)purdue.edu [https://www.purdue.edu/brand/images/Purdue_University-150_Years_of_Giant_Le…]

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Graduation Reception Leftovers in Kitchen
by Stacey, Lisa A 13 May '19

13 May '19

PLEASE HELP YOURSELVES to the leftover refreshments (cake, fruit, veggies, dips, fruit juice, etc) in the ARMS 2300 break area! Thanks, Lisa Stacey Administrative Assistant to Department Head Purdue University School of Materials Engineering Neil Armstrong Hall of Engineering 765/494-4095 staceyl(a)purdue.edu [https://www.purdue.edu/brand/images/Purdue_University-150_Years_of_Giant_Le…]

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Seminar Notice for Caitlin H. O'Grady's Preliminary Exam. Seminar, Thursday, May 9, at 1:00 p.m., in Chaffee Auditorium, Review, same day, at 2:00, in Chaffee Conference Room, Exam, same day, at 2:30, in Chaffee Conference Room.
by Son, Rosemary E 09 May '19

09 May '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Investigating Typical Additive Manufacturing Defects and Generation of Hot Spots Under Shock Loading" By Caitlin H. O'Grady Purdue MSE Preliminary Exam Advisors: Professor Steven F. Son and Professor Weinong W. Chen ABSTRACT Additive Manufacturing (AM) techniques are increasingly being utilized for energetic material processes and research. The downside to utilizing current AM techniques is that samples fabricated using these techniques often develop artifacts or defects during the manufacturing process. This work reviews current literature on the topics of hot spot formation and current AM techniques of Robocasting (aka Direct Ink Write). Robocasting is a type of direct ink writing AM technique that consists of extruding cylindrically-shaped beads with high solids loading that are suspended in a paste-like mixture into layers that are used to build 3D structures. The technique has been utilized for different mixtures of high explosives (HE). The technique is currently being developed for different HE materials. Robocasting techniques can result in samples with natural defects like cracking, delamination, conglomerates, and voids. My research will focus on three proposed detonation experiments that consist of testing samples created via robocasting techniques and other samples created via Physical Vapor Deposition (PVD) techniques. Samples created via robocasting techniques will be chosen because they can have artifacts and defects in the material that are a natural result of the Robocasting process. PVD explosive samples will be used as a model system to investigate the effects of these typical AM artifacts or defects on explosive samples. PVD techniques allow for precise control of geometry to simulate typical AM artifacts or defects embedded into explosive samples. These experiments will attempt to explore the mechanisms that govern the formation of hot spots by experimentally testing the interactions of detonation/shock front with typical material artifacts or defects that can result from robocasting techniques. An ultra-high-speed framing camera and streak camera will be used to view the samples under dynamic shock loading. Date: Thursday, May 9, 2019 Time: 1:00 P.M. Place: Chaffee Auditorium

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snacks in staff/faculty kitchen
by Coar, Stacey L 07 May '19

07 May '19

There are cupcakes and candy leftover from my future granddaughters baby shower this weekend. Please help yourself, the snacks are in the staff/faculty kitchen. Stacey Stacey Coar Secretary/Development Assistant School of Materials Engineering Purdue University Neil Armstrong Hall of Engineering 701 West Stadium Ave. Room 2300 West Lafayette, IN 47907 765-494-4100 scoar(a)purdue.edu<mailto:scoar@purdue.edu>

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Seminar Reminder for Walt Williams' Preliminary Exam. Seminar, Friday, May 3, at 9:00 a.m., in ARMS 1028 " Microstructural Evolution of U-Zr Nuclear Fuel Throughout Fabrication and Irradiation"
by Son, Rosemary E 02 May '19

02 May '19

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Microstructural Evolution of U-Zr Nuclear Fuel Throughout Fabrication and Irradiation" By Walter J. Williams Purdue MSE Preliminary Exam Advisor: Professor Maria A. Okuniewski ABSTRACT Advanced modeling and modern material science techniques are being coupled to help explain and predict how the microstructure, and thus the overall behavior, of U-Zr alloys will evolve during irradiation. Historically, the complexity of the operating environment and convolved phenomena have hindered fuel engineers from providing quantitative, mechanistic explanations and computational models desired for fuel design optimization decisions. Deployment of material science instruments and microstructural/performance modeling platforms capable of handling nuclear material has provided a pathway for a more detailed exploration into the fundamental phenomena that impacts bulk fuel behavior. Two microstructural phenomena, fuel swelling and thermally driven constituent redistribution, were identified as areas warranting further investigation. The scoping analysis suggested that the following parameters should be explored as driving forces for the phenomena of interest: temperature, composition, crystallographic texture, temperature gradient, fission density, and fission rate. Separate effects testing was chosen to deconvolve these driving forces and phenomena in order to further the fundamental understanding of fuel performance. In order to isolate these variables while remaining relevant to the regimes observed in pin type fast reactor fuels, a novel fabrication technique was utilized to create thin foils of various U-Zr alloys. The microstructure throughout fabrication was investigated through scanning electron microscopy, electron dispersive spectroscopy, and neutron diffraction in order to create an out-of-pile baseline for microstructural evolution. Date: Friday, May 3, 2019 Time: 9:00 A.M. Place: ARMS 1028

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