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MSE SEMINAR NOTICE - M. Cherukara, PhD Prelim Exam Part I, Wed. 3/20/13, 1:00 pm
by Stacey, Lisa A 13 Mar '13

13 Mar '13

Please see seminar notice below: MATERIALS SCIENCE AND ENGINEERING SEMINAR Thermal Conductivity of Silicon and Silicon/Germanium Core/Shell Nanowires By: Matthew Cherukara Ph.D. Prelim Examination Part I Advisor: Prof. A. Strachan ABSTRACT Thermoelectricity, the conversion of temperature differences to differences in electrical potential and vice versa, has been known since the early 19th century from work done by Seebeck, Peltier and Thomson. Their widespread use is still limited, however, by the low efficiencies of the best thermoelectric materials available today. The thermoelectric efficiency, described by a figure of merit (ZT), is a function of both the thermal and electronic properties of the material. Recent attempts to improve the ZT of materials have focused on the reduction of thermal conductivity without adversely affecting the electronic conductivity of the material. Si/Ge core/shell nanowires show promise, with the reduction in thermal conductivity coming from the increased phonon scattering at the interfaces and at the free surface. The proposed use of an amorphous Ge coating on crystalline Si and the use of core/shelled nanotubes could further lower the thermal conductivity, possibly improving the efficiency enough for this class of materials to compete with traditional systems of cooling and power generation. Date: Wednesday, March 20, 2013 Time: 1:00 P.M. Place: ARMS 1028 Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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Winchell Seminar Series Notice
by Stacey, Lisa A 08 Mar '13

08 Mar '13

Please see attached notice for our next Peter G. Winchell Lecture Series seminar on Friday, March 22nd. Please plan to attend. Thank you, Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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Fwd: [ARMS-all-list] FW: Scheduled Power Outage for Armstrong Hall: Monday, March 11, 2013 *REMINDER*
by Donna Bystrom 08 Mar '13

08 Mar '13

All, This is a reminder of the scheduled power outage taking place within Armstrong Hall at 5:00am on Monday. Please be sure to turn off all electrical equipment, including computer workstations, before leaving campus for the weekend/Spring Break. Please distribute the information within your unit in order to be certain that everyone is alerted to this upcoming outage. Thanks, Donna *From:*Ahlen, Donna J *Sent:* Friday, March 01, 2013 8:52 AM *To:* ARMS-all-list(a)ecn.purdue.edu *Cc:* Beever, James E; sydelko(a)ecn.purdue.edu; Schwartz, Jay A; Crowe, Kimberly A; Enos, Mary K.; Goodwin, Andrew B; Taylor, Edward A; Horan, Carol J.; Hutson, Susan B.; Fix, Scott A; doesite(a)ecn.purdue.edu; Lindley, Dennis E *Subject:* Scheduled Power Outage for Armstrong Hall: Monday, March 11, 2013 All, There will be a 15-minute scheduled power outage taking place within Armstrong Hall at 5:00am on Monday, March 11, 2013. This outage is part of a campus-wide metering project. This outage has been scheduled to take place during Spring Break in an effort to reduce the impact on faculty, staff, and students working in ARMS. Please be certain to completely shut down all electrical devices, including computer workstations, before leaving campus for Spring Break. If you will be in work status during Spring Break, please be sure to completely shut down all electrical devices prior to 5:00am Monday morning, March 11. This notice is being distributed via the Armstrong Hall email list, but we ask that it also be distributed within your unit in order to ensure that everyone is alerted to this upcoming outage. Thank you, and please feel free to contact either Phil or me if you have any questions, Donna Donna J. Ahlen College of Engineering Facilities Manager Email: ahlendj(a)purdue.edu <mailto:ahlendj@purdue.edu> (765) 496-9501

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FW: SEMINAR REMINDER: J. Yanke PhD Final Exam, Friday, 3/8/13, 10 am, ARMS 1028
by Stacey, Lisa A 07 Mar '13

07 Mar '13

Please see Jeff's seminar notice for this Friday to follow: MATERIALS SCIENCE AND ENGINEERING SEMINAR Numerical Modeling of Materials Processes With Fluid-Fluid Interfaces By: Jeffrey Yanke Ph.D. Final Examination Co-Advisors: Prof. M. Krane and Prof. R. Trice ABSTRACT This presentation will focus on the simulation of two very different materials processes: Electroslag remelting (ESR) of meter long, 4500 kg ingots of superalloy and the deposition of micron scale diameter ceramic powders on a substrate via plasma spray deposition. While these two processes occur on vastly different size scales, the common feature in both processes is that the numerical methods that describe the impact and deformation of a liquid ceramic droplet also apply to the interaction between metal and slag in ESR. ESR is a secondary melting technique that passes an AC current through an electrically resistive slag to provide the heat necessary to melt the alloy being cast. The simulation tracks the interface between the slag and metal. The model was validated against industrial scale ESR ingots and was able to predict trends in melt rate, sump depth, macrosegregation, and liquid sump depth correctly. In order to make more qualitative predictions, several constant current ESR runs were simulated focusing on the effects of including freezing slag in the model. Including the solidifying slag in the model was found to have an effect on the melt rate and sump shape but there is too much uncertainty in ESR slag data at this time for quantitative predictions. The second process investigated in this work is the deposition of ceramic coatings via plasma spray deposition. In plasma spray deposition, powderized coating material is injected in to a plasma that melts and carries the powders towards the substrate were they impact, flattening out and freezing. The impacting droplets pile up to form a porous coating. The model is used to simulate this rain of liquid ceramic particles impacting the substrate to form a coating. Trends in local solidification time and porosity are calculated for varying particle sizes and velocities. The predictions of porosity decreasing with increasing particle velocity observed matches experimental results. Date: Friday, March 8, 2013 Time: 10:00 A.M. Place: ARMS 1028 PURDUE MSE [cid:image003.png@01CE1B53.F7BE4340] Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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Fwd: PPDA Friday Coffee
by Donna Bystrom 07 Mar '13

07 Mar '13

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Fwd: Amelia's Café
by Donna Bystrom 06 Mar '13

06 Mar '13

All– Just a reminder that Amelia’s Café will be closed next week for Spring Break. Looking ahead to summer break, the Café has decided to remain open this year. Operating hours will be from 8 AM – 2 PM, Monday through Friday. Thanks, Phil Qualio <https://engineering.purdue.edu/Engr/People/ptProfile?resource_id=59120> Building Deputy Neil Armstrong Hall of Engineering Potter Engineering Center 765.496.9757 — 765.494.7020

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SEMINAR NOTICE: J. Yanke PhD Final Exam, Friday, 3/8/13, 10 am, ARMS 1028
by Stacey, Lisa A 04 Mar '13

04 Mar '13

Please see Jeff's seminar notice for this Friday to follow: MATERIALS SCIENCE AND ENGINEERING SEMINAR Numerical Modeling of Materials Processes With Fluid-Fluid Interfaces By: Jeffrey Yanke Ph.D. Final Examination Co-Advisors: Prof. M. Krane and Prof. R. Trice ABSTRACT This presentation will focus on the simulation of two very different materials processes: Electroslag remelting (ESR) of meter long, 4500 kg ingots of superalloy and the deposition of micron scale diameter ceramic powders on a substrate via plasma spray deposition. While these two processes occur on vastly different size scales, the common feature in both processes is that the numerical methods that describe the impact and deformation of a liquid ceramic droplet also apply to the interaction between metal and slag in ESR. ESR is a secondary melting technique that passes an AC current through an electrically resistive slag to provide the heat necessary to melt the alloy being cast. The simulation tracks the interface between the slag and metal. The model was validated against industrial scale ESR ingots and was able to predict trends in melt rate, sump depth, macrosegregation, and liquid sump depth correctly. In order to make more qualitative predictions, several constant current ESR runs were simulated focusing on the effects of including freezing slag in the model. Including the solidifying slag in the model was found to have an effect on the melt rate and sump shape but there is too much uncertainty in ESR slag data at this time for quantitative predictions. The second process investigated in this work is the deposition of ceramic coatings via plasma spray deposition. In plasma spray deposition, powderized coating material is injected in to a plasma that melts and carries the powders towards the substrate were they impact, flattening out and freezing. The impacting droplets pile up to form a porous coating. The model is used to simulate this rain of liquid ceramic particles impacting the substrate to form a coating. Trends in local solidification time and porosity are calculated for varying particle sizes and velocities. The predictions of porosity decreasing with increasing particle velocity observed matches experimental results. Date: Friday, March 8, 2013 Time: 10:00 A.M. Place: ARMS 1028 PURDUE MSE [cid:image003.png@01CE18F6.2BD76180] Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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Fwd: FW: Physical Facilities Connection Special Alert – March 4, 2013
by Donna Bystrom 04 Mar '13

04 Mar '13

<mailto:rmkiefer@purdue.edu;rlterry@purdue.edu> *University-Wide News* Increase in Parking Garage Utilization March 5-7 <https://www.purdue.edu/pfcommunications/university_wide/news_events/road_co…>

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REMINDER: Winchell Seminar Notice, TODAY Friday, March 1, 2013 - 3:30 pm
by Stacey, Lisa A 01 Mar '13

01 Mar '13

Please see attached announcement of our next Winchell Series Seminar this Friday, March 1st featuring Dr. Daan Maijer, University of British Columbia. Please plan to attend if possible. Thank you, Lisa Stacey Secretary/Development Assistant Purdue University School of Materials Engineering 765/494-4100

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Fwd: PPDA Seminar
by Donna Bystrom 27 Feb '13

27 Feb '13

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