Mechanical properties for irradiated face-centred cubic nanocrystalline metals

材料科学 辐照 粒度 纳米晶材料 硬化(计算) 软化 晶界 晶界强化 晶界滑移 复合材料 冶金 纳米技术 微观结构 物理 核物理学 图层(电子)
作者
Xiazi Xiao,Dingkun Song,Haijian Chu,Jianming Xue,Huiling Duan
出处
期刊:Proceedings of The Royal Society A: Mathematical, Physical and Engineering Sciences [Royal Society]
卷期号:471 (2177): 20140832-20140832 被引量:14
标识
DOI:10.1098/rspa.2014.0832
摘要

In this paper, a self-consistent plasticity theory is proposed to model the mechanical behaviours of irradiated face-centred cubic nanocrystalline metals. At the grain level, a tensorial crystal model with both irradiation and grain size effects is applied for the grain interior (GI), whereas both grain boundary (GB) sliding with irradiation effect and GB diffusion are considered in modelling the behaviours of GBs. The elastic-viscoplastic self-consistent method with considering grain size distribution is developed to transit the microscopic behaviour of individual grains to the macroscopic properties of nanocrystals (NCs). The proposed theory is applied to model the mechanical properties of irradiated NC copper, and the feasibility and efficiency have been validated by comparing with experimental data. Numerical results show that: (i) irradiation-induced defects can lead to irradiation hardening in the GIs, but the hardening effect decreases with the grain size due to the increasing absorption of defects by GBs. Meanwhile, the absorbed defects would make the GBs softer than the unirradiated case. (ii) There exists a critical grain size for irradiated NC metals, which separates the grain size into the irradiation hardening dominant region (above the critical size) and irradiation softening dominant region (below the critical size). (iii) The distribution of grain size has a significant influence on the mechanical behaviours of both irradiated and unirradiated NCs. The proposed model can offer a valid theoretical foundation to study the irradiation effect on NC materials.
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