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MATERIALS ENGINEERING

SEMINAR

“Irradiation Response of Nanocrystalline Metals”

By

Tongjun Niu

Purdue MSE Ph.D. Preliminary Exam

Advisor: Professor Xinghang Zhang

ABSTRACT

Exposing to energetic particle irradiation induces significant microstructure evolution and property degradation in irradiated materials. One general strategy to alleviate radiation damage is to introduce abundant defect sinks. Grain boundaries (GBs) are effective defect sinks, and nanocrystalline (NC) metals with abundant GBs have promising applications in nuclear reactors. The mechanisms of defect-grain boundary interactions have been widely investigated by both simulations and experiments. Experimental studies show distinct size effect on enhanced radiation tolerance of nanocrystalline metals compared to their bulk counterparts. However, the high angle GBs in NC metals are often unstable during radiation. The suppression of irradiation-induced grain growth at elevated temperatures is one of the significant challenges for design high temperature radiation resistant NC metals.

Date: Wednesday, October 3, 2018

Time: 8:30 A.M.

Place: ARMS 1028