Tailoring grain size distribution for optimizing strength and ductility of multi-modal Zr
Tailoring grain size distribution for optimizing strength and ductility of multi-modal Zr
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DOI：
10.1016/j.matlet.2013.07.001
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发表时间：
2013-10
影响因子：
3
通讯作者：
Yindong Shi;Ming Li;D. Guo;T. Ma;Zhibo Zhang;Guosheng Zhang;Xiangyi Zhang
中科院分区：
文献类型：
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作者：
Yindong Shi;Ming Li;D. Guo;T. Ma;Zhibo Zhang;Guosheng Zhang;Xiangyi Zhang
在这项研究中，多模态Zr金属组成的纳米晶粒（NG），超细晶粒（UFG）和微米晶粒（CG）具有不同的尺寸分布已通过低温轧制，然后热退火。由UFG和CG组成的多模态Zr的强度近似遵循混合规则与CG的体积分数，而其在轧制方向上的塑性正偏离的规则的混合。晶粒尺寸分布在200 nm ~ 1.6 μm范围内的78%UFG +22%CG试样具有较高的抗拉强度（σB ≥ 650 MPa）和均匀延伸率（εu ≥ 13.4%），远优于CG Zr的σB ≥ 350 MPa和εu ≥ 13.8%。本文的研究对于通过多尺度结构设计提高工程材料的强度和塑性具有重要意义。
In this study, multi-modal Zr metals composed of nano-grains (NG), ultrafine-grains (UFG) and micro-grains (CG) with various size distributions have been produced via cryorolling followed by thermal annealing. The strength of the multi-modal Zr consisting of UFG and CG follows approximately the rule-of-mixtures with the volume fraction of CG, while its ductility in the rolling direction deviates positively from the rule-of-mixtures. The 78% UFG+22% CG sample with a grain size distribution in the range of 200 nm–1.6 μm exhibits a good combination of high tensile strength (σb∼650 MPa) and uniform elongation (εu∼13.4%), much better than that of CG Zr,σb∼350 MPa andεu∼13.8%. The present study is significant for the enhancement of strength and ductility of engineering materials via the design of multi-scale structure.