Reminder for Cuncai's Prelim Seminar From: Son, Rosemary E Sent: Thursday, May 04, 2017 8:30 AM To: 'msefaculty-list@ecn.purdue.edu' <msefaculty-list@ecn.purdue.edu>; 'msegradstudent-list@ecn.purdue.edu' <msegradstudent-list@ecn.purdue.edu>; 'mseposdoc-list@ecn.purdue.edu' <mseposdoc-list@ecn.purdue.edu> Cc: 'Cuncai Fan' <fan184@purdue.edu>; Cline, Vicki L. <vicline@purdue.edu>; Son, Rosemary E <son39@purdue.edu> Subject: Seminar Notice for Cuncai Fan's Preliminary Exam, May 12, at 9:00 a.m., in ARMS 1021, " Radiation Damage in Nano-Crystalline Metals" MATERIALS ENGINEERING SEMINAR "Radiation Damage in Nano-Chrystalline Metals" By Cuncai Fan Purdue MSE Ph.D. Preliminary Exam Advisor: Professor Xinghang Zhang ABSTRACT Materials exposed to heavy irradiation of energetic neutrons or ions are subject to damage cascade with significant microstructural alteration. For crystalline metals, large concentrations of point defects or defect clusters are formed in them, together with radiation-induced segregation or precipitation in some metallic alloys. These microstructural changes typically cause significant changes in the physical and mechanical properties, such as swelling, growth and creep, as well as hardness and embrittlement. Previous studies indicate that nano-crystalline metals exhibit a higher radiation tolerance than their coarse-grained counterparts. This enhanced property is ascribed to the high density of grain boundaries that can act as effective defect sinks and suppress radiation damage. Meanwhile, radiation often induce grain growth in nano-crystalline metals, and thus it remains a challenge to design and synthesize resistant materials with high stability. Keywords: damage cascade, defect clusters, property degradation, defect sinks, grain coarsening. Date: Friday, May 12, 2017 Time: 9:00 A.M. Place: ARMS 1021