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Materials Science Seminar

IS SEGREGATION-INDUCED GRAIN BOUNDARY EMBRITTLEMENT
A POLYMORPHOUS MELTING PROCESS?Nghi Q. Lam
Argonne National Laboratory
Argonne, IL 60439 A number of important contributions to our understanding of solid-state amorphization and segregation-induced grain boundary embrittlement have been made
in recent years. The two processes have traditionally been regarded as completely different phenomena belonging to different branches of materials science. However, recent systematic studies on Ni-S alloys have revealed striking similarities in the kinetics of S-implantation-induced amorphization and S-induced grain boundary embrittlement. In this presentation, we examine the underlying thermodynamics and show that both phenomena can be regarded as a polymorphous melting process. Disorder-induced melting of grain boundaries gives rise to low fracture resistance due to the ability of a crack to propagate readily through amorphous material.All first year MASC students are required to attend.

Location: John Stauffer Science Lecture Hall (SLH) - 102

Audiences: Everyone Is Invited

Contact: Petra Pearce

This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.

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