December 2021 - Msepostdoc-list

Preliminary Exam Seminar, December 16, Thursday at 10 AM
by Morgan, Yuan-Yu Karen 02 Dec '21

02 Dec '21

Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Characterizing the Structure and the Mechanism of Constructing the Apis Mellifera Honeycomb" By Rahul Franklin Purdue MSE Preliminary Exam Advisor: Professor Nikhilesh Chawla ABSTRACT The natural honeycomb with its repeating hexagonal lattice cells made out of wax are some of nature's best engineered structures that has both fascinated and inspired human beings for millennia. Even though the honeycomb has inspired several modern engineering structures, an understanding of how the bees build them is lacking. Further, all previous works on studying the structure of the honeycomb have been based on 2D microscopy techniques or by direct visual observations. As a result, several seminal features of the comb which would have otherwise given us a fundamental understanding of how it is built have been overlooked and ignored. Looking at the honeycomb from a materials science and engineering perspective would help us in elucidating this problem and could have several widespread implications in fields such as additive manufacturing, composite materials, synthetic materials, and entomology. Date: December 16, Thursday, 2021 Time: 10:00 AM Place: Webex- 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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REMINDER: Preliminary Exam Seminar December 3, Friday, 8:30 AM by Webex
by Morgan, Yuan-Yu Karen 02 Dec '21

02 Dec '21

From: Msegradstudent-list <msegradstudent-list-bounces(a)ecn.purdue.edu> On Behalf Of Morgan, Yuan-Yu Karen Sent: Friday, November 19, 2021 9:29 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] Preliminary Exam Seminar December 3, Friday, 8:30 AM by Webex Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Magnetic Field-assisted Anisotropic Polymer-based Piezoresistive Composite with Tunable Electrical and Mechanical Properties" By Nagarpita Moka Vidyanag Purdue MSE Preliminary Exam Advisor: Professor Mukerrem Cakmak ABSTRACT Polymer composites that exhibit piezoresistive behavior have been actively sought in the emerging field of flexible electronics as a replacement for traditional metallic or semiconductor-based devices. A particularly attractive area of application for these flexible piezoresistors is their use as pressure sensors due to their ability to endure large mechanical strains (stretchability) while retaining their electrical conductivity. Magnetic field manipulation of metallic particles with high magnetic susceptibilities (Fe, Co, Ni) is an effective technique to fabricate anisotropic composites by forming pearl-chain columns that drastically reduce the concentration of fillers required to produce enhanced piezoresistive performance. The alignment of particles in the through-thickness direction creates induced percolation thereby resulting in a lightweight, optically transparent, and conformable composite. This review aims to provide an insight into the research advances in the development of flexible piezoresistive composites via a mechanistic understanding of the structural evolution of column structures during the alignment process. Various strategies employed to improve column morphology by tuning processing conditions are explored with the foresight of implementing it on roll-to-roll manufacturing technology. Finally, the influence of the mechanical modulus of the viscoelastic polymer matrix on the final composite property is also addressed to highlight the importance of careful design procedures that need to be adopted to maximize the sensitivity and stability of these pressure sensing elements. Date: December 3, 2021 Time: 8:30 AM Place: Webex---https://purdue.webex.com/meet/cakmak 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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REMINDER: Preliminary Exam Seminar Tomorrow Friday, Dec 3, 9:30 AM
by Morgan, Yuan-Yu Karen 02 Dec '21

02 Dec '21

From: Msegradstudent-list <msegradstudent-list-bounces(a)ecn.purdue.edu> On Behalf Of Morgan, Yuan-Yu Karen Sent: Friday, November 19, 2021 1:30 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] Preliminary Exam Seminar Friday, Dec 3, 9:30 AM Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Modeling of the Growth of Self-assembled Thin Film with Pillar-in-matrix Configuration" By Ahmad Ahmad Purdue MSE Preliminary Exam Advisor: Professor Anter El-Azab ABSTRACT The interesting physical and chemical properties of self-assembled oxide-metal thin films with pillar-in-matrix configurations, known as vertically aligned nanocomposite (VAN), have received a great deal of attention lately. The growth and morphology evolution processes of such films are so complicated that our current understanding of them is still limited. Current research has suggested that, on a thermodynamic basis, the ordering and evolution of the embedded phase configuration in the matrix can be described by in terms of the lattice-mismatch elastic strain and the interfacial energy. From a self-assembly point of view, however, adatom diffusion on the surface, binding energies, and elastic strain influence the clustering, nucleation, and growth of phases. The Kinetic Monte Carlo (KMC) method and the phase field framework capture these events at the atomic and mesoscopic (continuum) sales, respectively. From an experimental point of view, the growth of VAN systems can be affected by the physical and chemical parameters in the pulsed laser deposition technique. There are several reports in the literature describing how such parameters may be incorporated as boundary conditions into the KMC and phase field frameworks to predict the morphological evolution of VAN the systems. In this talk, I will review the use of KMC and phase field methods and how they can be utilized in simulating the growth of multiphase self-assembled nanostructure films. Date: Friday, Dec 3, 2021 Time: 9:30 AM WebEx: https://purdue.webex.com/meet/aelazab | 641105180 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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REMINDER: Final Defense Seminar, Tomorrow, Friday, December 3, at 10 AM by Webex
by Morgan, Yuan-Yu Karen 02 Dec '21

02 Dec '21

From: Morgan, Yuan-Yu Karen Sent: Friday, November 19, 2021 11:35 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: Final Defense Seminar, Friday, December 3, at 10 AM by Webex Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR “Preferential Microstructural Pathways of Strain Localization within Nickel and Titanium Alloys” By John Rotella Purdue MSE Final Defense Exam Advisors: Professor Michael Sangid and Professor Rodney Trice ABSTRACT Modern structural materials utilize tailored microstructures to retain peak performance within the most volatile operating conditions. Features such as grain size, grain boundary (GB) character and morphology and secondary phases are just a few of the tunable parameters. By tailoring these types of microstructural features, the deformation behavior of the material is also altered. The localization of plastic strain is directly correlated to material failure. Thus, a systematic approach was utilized to understand the effect of microstructural features on the localization of plastic deformation utilizing digital image correlation (DIC). First, at the macroscopic scale, strain accumulation is known to form parallel to the plane of maximum shear stress. The local deviations in the deformation pathways at the meso-scale are investigated relative to the plane of maximum shear stress. The deviations in the deformation pathways are observed to be a function of the accumulated local plastic strain magnitude and the grain size. Next, strains characterized via DIC were used to calculate a value of incremental slip on the active slip systems and identify cases of slip transmission. The incremental slip was calculated based on a Taylor-Bishop-Hill algorithm, which determined a qualitative assessment of deformation on a given slip system, by satisfying compatibility and identifying the stress state by the principle of virtual work. Inter-connected slip bands, between neighboring grains, were shown to accumulate more incremental slip (and associated strain) compared with slip bands confined to a single grain, where slip transmission did not occur. These results rationalize the role of grain clusters leading to intense strain accumulation and thus serving as potential sites for fatigue crack initiation. Lastly, at GB interfaces, the effect of GB morphology (planar or serrated) on the cavitation behavior was studied during elevated temperature dwell-fatigue at 700 °C. The resulting γ′ precipitate structures were characterized near GBs and within grains. Along serrated GBs coarsened and elongated γ′ precipitates formed and consequently created adjacent regions that were denuded of γ′ precipitates. Cyclic dwell-fatigue experiments were performed at low and high stress amplitudes to vary the amount of imparted strain on the specimens. Additionally, the regions denuded of the γ′ precipitates were observed to localize strain and to be initial sites of cavitation. These results present a quantitative strain analysis between two GB morphologies, which provides the micromechanical rationale to assess the increased proclivity for serrated GBs to form cavities. PURDUE MSE [cid:image004.png@01D7E75B.299B4200] Date: Friday, December 3, 2021 Time: 10:00 AM WebEx: https://purdue.webex.com/join/msangid

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FW: Analytical Seminar, Tuesday, Dec 7, 2021 Dr. Jonathan Reid, UK
by Son, Rosemary E 01 Dec '21

01 Dec '21

From: Hanna, Thomas J Sent: Wednesday, December 1, 2021 3:52 PM 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: Analytical Seminar, Tuesday, Dec 7, 2021 Dr. Jonathan Reid, UK Please distribute the attached announcement notice in 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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GM is looking for a researcher with knowledge in thermodynamics
by Morgan, Yuan-Yu Karen 01 Dec '21

01 Dec '21

Dear Postdocs and Graduating students, GM in Michigan is looking for recent graduates (or soon to graduate) with "battery experience but more importantly thermodynamics expertise such as thermal degradation and calorimetry". If qualified and interested, please check out this job posting: https://search-careers.gm.com/job/JR-000061420/Researcher-Battery-abuse-cha… Boiler up, Dr. Morgan 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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REMINDER: Preliminary Exam Seminar Tomorrow, Thursday, November 2, 9 AM
by Morgan, Yuan-Yu Karen 01 Dec '21

01 Dec '21

From: Msegradstudent-list <msegradstudent-list-bounces(a)ecn.purdue.edu> On Behalf Of Morgan, Yuan-Yu Karen Sent: Thursday, November 18, 2021 4:51 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] Preliminary Exam Seminar Thursday, November 2, 9 AM Please consider attending this seminar: MATERIALS ENGINEERING SEMINAR "Mechanisms and Approaches to Improve Oxidation Resistance of Transition Metal Nitrides" By Yizhi Zhang Purdue MSE Preliminary Exam Advisor: Professor Haiyan Wang ABSTRACT Transition metal nitrides (TMN) have attracted interest from scientists for many years due to their unique optical, electrical, thermal, and mechanical properties. TiN and ZrN have already been used as commercial hardness coating for cutting tools. However, most transition metal nitrides coating will be oxidized and lose their coating function at high temperatures. (e.g. TiN coating is oxidized at as low as 600ºC) This phenomenon not only increased the difficulty to produce high-quality TMN coating but also limited the further applications of transition metal nitrides. To explore further applications, it is necessary to find a suitable way to improve the oxidation resistance of transition metal nitrides. In this review, the oxidation mechanism and previous approaches to improve the oxidation resistance will be discussed, as well as the existence challenge and promising future work. Date: December 2, 2021 Time: 9:00 AM WebEx: https://purdue.webex.com/purdue/j.php?MTID=m9be27b91e7e1fdc0f58f371a75fc9ffb 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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