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Fwd: Seminar Aug 28th, 1:45
by Donna Bystrom 21 Aug '17

21 Aug '17

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CoE Staff Awards of Excellence - Accepting Nominations - by September 22
by Coar, Stacey L 14 Aug '17

14 Aug '17

Good morning MSE Faculy, Staff and students, If you know a member of our staff that you think does an amazing job and want to see them get credit for a job well done, here is your chance to get them recognized. I have included the nomination form and criteria that needs to be met for the any nomination, feel free to contact me with any questions. Stacey... On behalf of the College of Engineering's Staff Awards Committee, nominations for the 16th annual Awards of Excellence for Engineering Staff are now being accepted. Please find the nomination information and criteria here: 2017 CoE Staff Awards of Excellence Nomination Forms & Criteria<https://engineering.purdue.edu/Intranet/Groups/Administration/AA/Awards/Nom…> Faculty and staff may review the nomination categories and selection criteria and nominate deserving A/P and C/S staff members! Nominations are due by 5:00 pm on Friday, September 22, 2017, and should be sent electronically to Will Sondgerath at wsondger(a)purdue.edu<mailto:wsondger@purdue.edu>. Past nominations may be carried over for one year following the initial submission. Nominators will be contacted the second year and will be provided the option of putting the nominee forward a second time, as well as having an opportunity to update their original submission. Recipients will be recognized at the Staff Awards Banquet which will take place at 6:00 p.m. on December 1, 2017, so be sure to mark your calendars. Thank you for taking the time to nominate your colleagues to recognize their achievements. Sincerely, The 2017 Staff Awards Committee<https://engineering.purdue.edu/Engr/People/Committees/ptPeopleListing?group…> William J. Sondgerath Dean's Chief of Staff Director for Administration, College of Engineering Neil Armstrong Hall of Engineering Purdue University West Lafayette, IN 47907 765-494-1871 wsondger(a)purdue.edu<mailto:wsondger@purdue.edu> [Description: W:\PU_signature_white_bg_215x80.png]

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REMINDER TODAY: MSE Seminar Speaker Professor Yashashree Kulkarni, August 9, 2017 ARMS 1109 10:30 am
by Coar, Stacey L 09 Aug '17

09 Aug '17

[cid:image003.png@01D31028.856659D0] 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 Seminar Speaker Professor Yashashree Kulkarni, Agenda and Seminar announcement/ August 9, 2017 ARMS 1109 10:30 am
by Coar, Stacey L 08 Aug '17

08 Aug '17

Good morning, Please see attached seminar announcement and agenda for our guest speaker Professor a Yashashree Kulkarni. If you have any questions please feel free to contact me or Professor Zhang. [cid:image001.png@01D31028.5E82E810] [cid:image002.png@01D31028.5E82E810] [cid:image003.png@01D31028.856659D0] 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 Tom Kanaby's Ph.D. Final, Tuesday, July 18, at 8:00 a.m., in ARMS 1103, "Cyclic Nano-Indentation Investigation of Plasticity in Case Hardened Bearing Steels"
by Son, Rosemary E 17 Jul '17

17 Jul '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Cyclic Nano-Indentation Investigation of Plasticity in Case Hardened Bearing Steels" By Thomas R. Kanaby Purdue MSE Ph.D. Final Exam Advisor: Professor David F. Bahr ABSTRACT Longevity of high performance gears and bearings is often limited by the spall crack initiation from rolling contact fatigue during service. Demands for performance and reliability are shifting some designs from through hardened bearing alloys to case hardened alloys. This shift presents a challenge for understanding ratcheting mechanisms that lead to crack initiation and mechanical predictions of bearing endurance. Advancement of case hardening alloys and process development are hampered by expensive and problematical contact fatigue tests, residual stress and other contributions to endurance, and assumptions used in predictions about properties in the plastically graded case. This effort asserts that the fine differences in structure result in differences in strain accumulation mechanisms that are discernible through micron level plasticity testing. A direct evaluation of microplasticity of case hardened bearing steels through cyclic nano-mechanical indention tests was employed to develop an understanding of the changes in strain energy accumulation during cycling. Cyclic indentation at various depths within graded microstructures from case hardened samples was performed within the typical active plastic zone in bearing alloys. With this technique, differences in microplasticity between samples of similar composition and hardness were discerned, and trends in matrix elastic losses with fatigue cycling were isolated from residual stress and other variables that cloud fatigue performance analysis. This method can be utilized in development and optimization of alloys and processing for high cycle and contact fatigue applications. Date: Tuesday, July 18, 2017 Time: 8:00 A.M. Place: ARMS 1103

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Seminar Reminder for Kiettipong Banlusan's Ph.D. Final, Friday, July 14, at 2:00 p.m., in ARMS 1028. " Relaxation Mechanisms Under Dynamical Loading of Metal-Organic Frameworks"
by Son, Rosemary E 14 Jul '17

14 Jul '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Relaxation Mechanisms under Dynamical Loading of Metal-Organic Frameworks" By Kiettipong Banlusan Purdue MSE Ph.D. Final Exam Advisor: Professor Alejandro Strachan ABSTRACT Metal-organic frameworks (MOFs) are a class of nano-porous crystalline solids consisting of inorganic units coordinated to the organic linkers. The unique molecular structures with ultra-high porosity, outstanding properties, and tunable chemical functionality by various choices of metal clusters and organic ligands make this class of materials attractive for many applications. The possible collapse of the large free volume fraction makes MOFs appealing for the applications that require dissipating mechanical energy, e.g. shock-wave energy dissipation. However, the deformation mechanisms beyond elastic regime and the dynamical effects of MOFs have not been well understood yet. Under shock compression materials can undergo various deformation processes including elastic deformation, plastic deformation, phase transition, and structural decomposition. Thus, understanding of mechanical properties is the key first step towards the shock wave investigation. We use density functional theory (DFT) to calculate the elastic stiffness coefficients of various types of MOFs to establish relationships between the structure and their elastic properties including anisotropy and temperature dependences. The mechanical properties of MOFs beyond elastic regime have been investigated using large-scale molecular dynamics (MD) simulations in order to capture the nucleation and propagation of plastic deformation under quasi-static compression. We use MD simulations with reactive ReaxFF force field that enables us to capture the chemical processes to study the dynamical effects of MOFs under shock loading. We find that MOFs exhibit two-wave structure with elastic precursor followed by the second wave corresponding to structural transition. A combined experimental and computational study shows that shock-wave energy flux generated from the impact of a flyer plate is attenuated via large volume collapse of MOFs structure, and the lower energy (~50%) is transmitted to the object in front of the wave. Finally, the simulations with reactive ReaxFF force field show that MOF undergoes chemical decomposition into small molecules with higher energy. This is an indication of possible endothermic chemical reaction, which could also absorb the shock-wave energy. Date: Friday, July 14, 2017 Time: 2:00 P.M. Place: ARMS 1028

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Seminar Reminder for Ben Helfrecht, Friday, July 14, at 10:00 a.m., in ARMS 1028, "Evaluation of Transition Metal Dichalcogenide Encapsulation to Improve Copper Interconnects: An ab Initio Study"
by Son, Rosemary E 14 Jul '17

14 Jul '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Evaluation of Transition Metal Dichalcogenide Encapsulation to Improve Copper Interconnects: An ab initio Study" By Benjamin A. Helfrecht Purdue MSE M.S. Exam Advisor: Professor Alejandro H. Strachan ABSTRACT Two-dimensional materials, such as graphene, hexagonal boron nitride, and transition metal dichalcogenides (TMDs), have gained much interest for their applications in nanoscale devices, especially nanoelectronics. In this regard, TMDs are particularly interesting, as this class of materials contains several stable compounds with a wide variety of properties, existing as semiconductors with tunable band gaps, metals, superconductors, and/or ferromagnets. However, in order to incorporate TMDs into devices, a fundamental understanding of the interfaces TMDs form with other materials, including metals, is required. This is especially true for Group IV and V dichalcogenides, which have received less attention than the Group VI dichalcogenides to date. The goal of this work is to identify trends in properties most relevant to TMD-encapsulated copper nanowires, which are envisioned as a candidate for ultra-scaled interconnect technology. In the spirit of this goal, the stability, adhesion, and electronic properties of interfaces between Cu(111) surfaces and TMDs of the form MX2, where M is a transition metal and X a chalcogen, are examined with ab initio computational methods. Select Group IV and V TMDs that are metals or small bandgap semiconductors (M = Ti, V, Nb) are studied alongside the Group VI semiconductors (M = Mo, W); all three chalcogenides (X = S, Se, Te) are studied for each transition metal. In addition, the ability of these TMDs to serve as diffusion barriers to copper and oxygen is also evaluated. Ground-state TMDs forming an interface with a Cu(111) surface are predicted to be stable, with binding energies per unit area three to five times greater than h-BN or graphene. The interactions between the Cu and TMD are dominated by van der Waals forces, but also have some covalent or ionic character. As a TMD becomes adsorbed on the Cu surface, charge rearrangement occurs at the interface resulting in a net dipole and a modulation of the work function that depends strongly on the chemistry of the TMD: increasing by up to 1 eV by encapsulating with a Group IV or V TMD and decreasing by up to 1 eV by encapsulating with a Group VI TMD. However, the Schottky barrier at the interface does not depend strongly on chemistry. All semiconductor TMDs studied form a Schottky barrier of roughly 0.5 eV with the Cu surface. No Schottky barrier is formed for the metallic TMDs. All Group IV, V, and VI dichalcogenides are also predicted to serve as adequate Cu and O diffusion barriers, with energy barriers of 3-5 eV, slightly less than those of h-BN and graphene (5-7 eV). Of the TMDs, the sulfides provide the highest energy barriers to both Cu and O diffusion. Date: Friday, July 14, 2017 Time: 10:00 A.M. Place: ARMS 1028

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Seminar notice for Matthew Krafcik's Ph.D. Final Exam, July 6, 9:30 a.m., in ARMS 1028, "Informing the Design of Hydrogel-Based Internal Curing Agents for Mortar: Effects of Hydrogel Chemistry on Mortar Microstructure and Mechanics"
by Son, Rosemary E 05 Jul '17

05 Jul '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Informing the Design of Hydrogel-Based Internal Curing Agents for Mortar: Effects of Hydrogel Chemistry on Mortar Microstructure and Mechanics" By Matthew J. Krafcik Purdue MSE Ph.D. Final Exam Advisor: Professor Kendra A. Erk ABSTRACT Despite the widespread usage of concrete and significant increases in concrete technology, including the use of new admixtures, supplementary materials, and improved batch design, two consistent problems for the concrete industry are carbon dioxide emissions and reduced service life due to cracking. High performance concrete with a water-to-cement ratio of below 0.42 is utilized to reduce greenhouse gas emissions and create a concrete with a dense microstructure and high compressive strength. Unfortunately, low water content increases the probability of early-age cracking due to volumetric shrinkage. Such cracking will decrease compressive strength, durability, and thus shorten service life. Internal curing has been shown to be a viable method of reducing or eliminating early-age cracking; however it is only in recent research that structure-property relationships between polymeric internal curing agents and bulk concrete performance are investigated. Superabsorbent polymer hydrogels of poly(sodium acrylate-co-acrylamide) are explored as a solution to early-age cracking in high performance concrete. Different weight fractions of monomers are used to formulate several chemically distinct types of hydrogels. Hydrogels are characterized with swelling tests in pure water, various salt solutions (sodium, calcium), and cement pore solution. Mortar with and without hydrogels is examined with autogenous shrinkage measurements, backscattered electron microscopy, and compression experiments. Model cement-hydrogel systems are also investigated with quasielastic neutron scattering. The chemical structure of the hydrogels is directly linked to swelling performance and is affected by the presence of cations, which were found to severely limit hydrogel swelling and, at times, cause deswelling. Mortar containing hydrogels displayed dramatically reduced shrinkage. Microscopy showed that while void space remained in mortar as the hydrogels deswelled, majority-acrylamide hydrogels allowed for the formation of calcium hydroxide inside the hydrogel void. Thus it is demonstrated that hydrogel composition can be tuned to change the microstructure of mortar depending on the desired application, which has wide-reaching implications for the admixture industry and advancement of cementitious materials. Date: Thursday, July 6, 2017 Time: 9:30 A.M. Place: ARMS 1028

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Seminar Reminder for John Coleman's Prelim, Wednesday, June 28, at 8:30 a.m., in ARMS 1028. "Numerical Modeling of Equiaxed Solidification: Application to Direct Chill Casting"
by Son, Rosemary E 27 Jun '17

27 Jun '17

Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Numerical Modeling of Equiaxed Solidification: Application to Direct Chill Casting" By John S. Coleman Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Matthew J. M. Krane ABSTRACT The relative motion of the solid and liquid phases during alloy solidification produces long range composition heterogeneities (macrosegregation) that lead to unwanted mechanical property variations in the final product. The addition of grain refiners to promote heterogeneous nucleation of equiaxed grains, typical of direct chill (DC) casting, presents further complications since the grains are free to move and grow in the natural convection flow of the bulk liquid until their eventual coalescence into a packed bed. Several numerical models have been proposed to elucidate the interplay between various transport phenomena responsible for the formation of grain structure and macrosegregation during equiaxed solidification. These models are evaluated in terms of their applicability to DC casting and a volume-averaged model is chosen based on its ability to resolve the microscale and macroscale phenomena concurrently. The phenomenological submodels which provide model input are further evaluated and areas of future research are addressed. Date: Wednesday June 28, 2017 Time: 8:30 A.M. Place: ARMS 1028

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Fwd: EEE Research Seminar - Dr. Callie Babbitt - June 30, 2017
by Donna Bystrom 26 Jun '17

26 Jun '17

*DATE: Friday June 30, 2017* *TIME: 10:30 A.M.* *LOCATION: POTR 234 – Fu Room* ** *Dr. Callie Babbitt* *Associate Professor, Sustainability* *Golisano Institute for Sustainability*** *Rochester Institute of Technology* ** *“Sustainable management of end-of-life lithium-ion batteries”* ** *//* Patti Finney Administrative Assistant Graduate Program Purdue University Environmental and Ecological Engineering pfinney(a)purdue.edu <mailto:pfinney@purdue.edu> Potter Engineering Center, Room 364F Phone: 765-496-0545 Fax: 765-494-4482

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