November 2012 - Msepostdoc-list

Coffee/Brownies/Cookies
by Stacey, Lisa A 09 Nov '12

09 Nov '12

In case you need a little boost to the end of your week/beginning of your weekend, there are leftover seminar cookies/brownies & coffee in the kitchen. I'll run down at 5 to dump remaining coffee. Thanks, Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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Fwd: PPDA November Social Interest
by Donna Bystrom 09 Nov '12

09 Nov '12

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Fwd: MSE Potluck tomorrow (Nov. 10)
by Donna Bystrom 09 Nov '12

09 Nov '12

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Fwd: MSE in Next Generation Scholars Research Fair
by Donna Bystrom 09 Nov '12

09 Nov '12

-------- Original Message -------- Subject: MSE in Next Generation Scholars Research Fair Date: Fri, 9 Nov 2012 09:58:07 -0500 From: Ozgur Keles <okeles(a)purdue.edu> To: Donna Bystrom <bystrom(a)ecn.purdue.edu> CC: David F Bahr <dfbahr(a)purdue.edu> Hi Donna, I got the e-mail below today indicating that there is not much interest in *Next Generation Scholars Research Fair *from the School of Materials Engineering. I will be glad if you can send the shorter version (see below) of the e-mails we have been getting to grad students and postdocs again. Thanks, Ozgur Keles Ph.D. Candidate School of Materials Engineering Purdue University http://ozgurkeles.com/ Shorther version of the e-mail: There is an exciting opportunity that I want to make you aware of – the *3^rd annual Next Generation Scholars Research Fair* organized by the Purdue Graduate Student Government! All Purdue graduate students are encouraged to participate. Link to PGSG page with additional details and application: _http://web.ics.purdue.edu/~pgsg/next-generation-scholars-research-fair/ <http://web.ics.purdue.edu/%7Epgsg/next-generation-scholars-research-fair/>_ Please contact Stefanie O'Neal einafets83(a)gmail.com <mailto:einafets83@gmail.com> with any questions or concerns. Thank you for your help. The e-mail I got: Good morning Ozgur- I interested in having more materials engineering students present at Next Generation Scholars on November 30th. You signed up to present and I am wondering if you have any friends from your department that may also be interested that you could talk to about presenting. Thank you for your help. -- Stefanie O'Neal

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Fwd: Food Harvest Food Drive
by Donna Bystrom 07 Nov '12

07 Nov '12

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Fwd: NNSA PRISM Fall Seminar Series - Friday, Nov. 9th, 2012
by Donna Bystrom 07 Nov '12

07 Nov '12

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FW: SEMINAR NOTICE - A. Rosenberger, PhD Prelim Exam Pt I, Wed. 11/14/12, 11:30 AM, HAMP 2107
by Stacey, Lisa A 07 Nov '12

07 Nov '12

(PLEASE NOTE SEMINAR LOCATION OUTSIDE OF ARMS) MATERIALS SCIENCE AND ENGINEERING SEMINAR Processing and Mechanical Properties of Silicon Nitride Nanoceramics by Andrew Rosenberger Ph.D. Prelim Exam - Part I Advisor: Prof. L. Stanciu ABSTRACT Silicon nitride is an engineering ceramic in limited use as components for automotive and aerospace applications. Reducing the grain size from the micron scale to the nanocrystalline level offers possibilities of enabling alternate processing techniques and enhancing mechanical properties. Experimental research has overcome the various processing and sintering difficulties necessary to produce silicon nitride nanoceramics and found significant improvements in hardness, wear resistance, and superplasticity. These improvements were attributed mainly to the reduced flaw size and enhancement of grain boundary sliding. Theoretical models have also been developed which describe possible mechanisms for improved toughness, but their applicability to actual materials is uncertain. Further research into microstructure control on the nanometer scale is proposed, as are methods to verify and apply the theoretical models of deformation. Date: Wednesday, November 14, 2012 Time: 11:30 A.M. Place: HAMP 2107 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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FW: SEMINAR NOTICE - L. Syarbaini, Ph.D. Prelim Exam Pt. I, Mon. 11/12/12, 3:30 PM, ARMS 3115
by Stacey, Lisa A 07 Nov '12

07 Nov '12

MATERIALS SCIENCE AND ENGINEERING SEMINAR The Influence of Metal Catalysts on Orientation and Growth of Germanium Nanowires by Luthfia Syarbaini Ph.D. Prelim Exam - Part I Advisor: Prof. C. Handwerker ABSTRACT Germanium (Ge) nanowires for use in transistors and electronic interconnects are being studied due to their one-dimensional growth and low growth temperatures in the presence of metal catalyst particles and appealing properties such as band-gap energy and high carrier mobility. Understanding the orientation effects on growth can potentially lead to the improved control of nanowire geometry and properties. The specific metal catalyst material has been reported to affect the nanowire orientation grown from silicon substrates. Among the various growth methods, such as vapor-liquid-solid (VLS), self-catalytic, and vapor-solid-solid (VSS), VSS growth demonstrates more control of the nanowire growth orientation. In this review, an analysis of the influence of metal catalyst material on orientation for the VSS and VLS methods is performed. Although there have been reports on orientation effects using metal catalysts, there has not been a systematic study of these effects with controlled growth parameters, including substrate, growth temperature and partial pressure. The study proposed here will focus on the influence of gold and copper metal catalyst type on VSS-grown Ge nanowires and their effects on orientation. Of particular interest, the solid Cu metal catalyst transforms into Cu3Ge while the Au metal catalyst does not change phase. The crystal structures of two solid catalysts and their orientation relationships with growing Ge nanowires will be studied to characterize the orientation and the underlying effects on Ge nanowire growth. Date: Monday, November 12, 2012 Time: 3:30 P.M. Place: ARMS 3115 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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ECE Seminar Announcement, Fri. 11/9/12
by Stacey, Lisa A 07 Nov '12

07 Nov '12

Please see attached ECE Seminar Announcement FYI.

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SEMINAR REMINDER: K. Swaminathan, MS Final Exam, Thur. 11/8, 8:30 am ARMS 1028
by Stacey, Lisa A 07 Nov '12

07 Nov '12

MATERIALS SCIENCE AND ENGINEERING SEMINAR Effect of Crystallographic Orientation on Sub-critical Grain Boundary Cracking in a Nickel Based Superalloy by Kameshwaran Swaminathan Master of Science Final Examination Co-Advisors: Prof. J. Blendell and Prof. K. Trumble ABSTRACT Sub-critical intergranular crack growth is an important creep fracture mechanism in polycrystalline superalloys. The root cause of this fracture is not well understood. The role of grain orientation on the formation of sub-critical grain boundary cracks during creep of a conventionally cast nickel-based superalloy has been analyzed in this study. The crystallographic orientations of grain pairs adjacent to grain boundaries normal to the tensile axis were measured using Electron Back-Scattered Diffraction (EBSD). The difference in the Schmid factor for the {111} <112> slip system between the grains was compared to the occurrence of sub-critical grain boundary cracking. In addition, the difference in the amount of potential primary creep strain between the grains (for unconstrained state) was analyzed. The cracked grain boundaries were found to have significantly larger Schmid factor mismatch, as well as larger potential primary creep strain mismatch, than those of the uncracked grain boundaries. These larger mismatches in Schmid factor and potential primary creep strain indicate possible development of large enough stress concentration at the grain boundary sufficient to initiate sub-critical cracks. The experimental results suggest possible correlation between crystallographic orientation of the grains and sub-critical cracking at the grain boundary with a critical value for Schmid factor mismatch and potential primary creep strain mismatch in the creep tested alloy. Assumptions and limitations are considered in proposing future experiments for further refinement of the analysis. Date: Thursday, November 8, 2012 Time: 8:30 A.M. Place: ARMS 1028 PURDUE MSE [cid:image003.png@01CDB83C.F28ABEA0] Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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