Materials Science and Engineering, Ames Laboratory
Journal or Book Title
It was recently reported that segregation of Zr to grain boundaries (GB) in nanocrystalline Cu can lead to the development of disorder in the intergranular structure [1,2]. In this study we employ atomistic computer simulations to investigate how this disorder affects dislocation nucleation from the GBs under applied stress. It was found that a fully disordered grain boundary structure suppresses dislocation emission and significantly increases the yield stress. Depending on the solute concentration and heat-treatment, however, partial disorder may also occur and this aids dislocation nucleation rather than suppressing it, reducing or eliminating the strengthening effect.
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Borovikov, Valery; Mendelev, Mikhail I.; and King, Alexander H., "Effects of Grain Boundary Disorder on Dislocation Emission" (2018). Materials Science and Engineering Publications. 317.
Available for download on Friday, November 20, 2020