msepostdoc-list Seminar CANCELATION for Dongsheng Wen's . It will be rescheduled for a later time.

[Son, Rosemary E]

This Preliminary Exam Seminar is postponed.  It will be rescheduled for a later time:


MATERIALS ENGINEERING
SEMINAR



"Thermodynamics of Suzuki Segregation and Stacking Fault Energy"

By
Dongsheng Wen
Purdue MSE Ph.D. Preliminary Exam

Advisor: Professor Michael Titus

ABSTRACT


Suzuki segregation is microscale solute segregation occurring at stacking faults in crystalline materials. It is a common phenomenon that exists in a variety of materials including metallic alloys, ceramics and polymers. Segregation at this length scale has profound impacts on macroscopic properties due to their close relationship with the stacking fault energy and the electronic structure. Incorporating Suzuki segregation in materials design process requires a comprehensive understanding of the thermodynamics of the phenomenon. It was not until recent decades that experimental and computational techniques allowed researchers to study this problem. This review provides a broad view of Suzuki segregation on several types of materials. Two major thermodynamic treatments are discussed to link the segregation to the stacking fault energy. Among all the materials, extensive focus has been on Ni- and Co-based superalloys because segregation to stacking faults strongly affects their high temperature creep behavior. Thermodynamic study of the equilibrium of segregation and the stacking fault energy can not only benefit superalloy design but also may shed light on similar problems in other materials.











Date: Tuesday, January 22, 2019

Time: 1:30 P.M.
Place: ARMS 1103

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