msepostdoc-list FW: Seminar Notice for Cuncai Fan's Preliminary Exam, May 12, at 9:00 a.m., in ARMS 1021, " Radiation Damage in Nano-Crystalline Metals"

[Son, Rosemary E]

Reminder for Cuncai's Prelim Seminar

From: Son, Rosemary E
Sent: Thursday, May 04, 2017 8:30 AM
To: 'msefaculty-list at ecn.purdue.edu' <msefaculty-list at ecn.purdue.edu>; 'msegradstudent-list at ecn.purdue.edu' <msegradstudent-list at ecn.purdue.edu>; 'mseposdoc-list at ecn.purdue.edu' <mseposdoc-list at ecn.purdue.edu>
Cc: 'Cuncai Fan' <fan184 at purdue.edu>; Cline, Vicki L. <vicline at purdue.edu>; Son, Rosemary E <son39 at 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

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