Simultaneously enhancing the ductility and strength of cryorolled Zr via tailoring dislocation configurations

Simultaneously enhancing the ductility and strength of cryorolled Zr via tailoring dislocation configurations
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通过定制位错配置同时增强冷冻轧制 Zr 的延展性和强度

DOI:
10.1016/j.msea.2012.08.061
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发表时间:
2012-12
影响因子:
6.4
通讯作者:
Xiangyi Zhang
Xiangyi Zhang
中科院分区:
材料科学1区
文献类型:
--
作者:
Defeng Guo;Ming Li;Yindong Shi;Zhibo Zhang;Tengyun Ma;Haitian Zhang;Xiangyi Zhang

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位错构型,例如纯 Zr 中的位错缠结、晶胞和片层已通过在 ε̇=0.59–2.24s−1 的应变率范围内冷冻轧制而形成,证明对机械性能有显着影响。在 ε̇=2.24s−1 下冷轧的 Zr 获得了延展性和强度的同时增强。延展性的增强是由于高应变速率下产生的位错片层结构中预先存在的位错在高拉应力下的运动,而强度的增强是由于冷轧Zr中位错密度的增加所致。
Dislocation configurations, e.g. dislocation tangles, cells and lamellas, in pure Zr have been tailored by cryorolling in the strain rate range of ε̇=0.59–2.24s−1, demonstrating a significant effect on mechanical properties. A simultaneous enhancement in the ductility and strength is obtained in the Zr cryorolled at ε̇=2.24s−1. The enhancement of ductility is due to the motion of preexisting dislocations under high tensile stress in dislocation lamella configurations yielded at the high strain rate, and the enhancement of strength results from the increase of dislocation density in the cryorolled Zr.
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