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应变速率对锆合金塑性变形机制的影响
引用本文:邹东利,栾佰峰,肖东平.应变速率对锆合金塑性变形机制的影响[J].稀有金属材料与工程,2014,43(8):1897-1901.
作者姓名:邹东利  栾佰峰  肖东平
作者单位:重庆大学,重庆 400044
基金项目:国家自然科学基金项目(50890172,51371202)
摘    要:通过控制应变水平,采用热模拟准静态压缩和霍普金森压杆高应变速率压缩相结合的技术,实现了锆合金不同应变速率条件下的塑性变形。结果表明:锆合金准静态压缩和高应变速率压缩的主要区别在于变形后期。准静态压缩时,位错在晶粒内部塞积成为锆合金塑性变形的主要方式,导致基体晶粒内部累积取向差逐渐增加;而高应变速率压缩时,剪切带成为锆合金塑性变形的主要方式。剪切带塑性变形方式的出现,部分协调了锆合金的塑性变形,导致基体晶粒内部累积取向差较低。

关 键 词:锆合金  应变速率  累计取向差

Influences of Strain Rate on the Plastic Deformation Mechanism of Zirconium Alloy
Zou Dongli,Luan Baifeng and Xiao Dongping.Influences of Strain Rate on the Plastic Deformation Mechanism of Zirconium Alloy[J].Rare Metal Materials and Engineering,2014,43(8):1897-1901.
Authors:Zou Dongli  Luan Baifeng and Xiao Dongping
Affiliation:Chongqing University, Chongqing 400044, China
Abstract:Different strain rates of zirconium alloy subjected to the plastic deformation were obtained by means of the controlled strain levels and the combined methods of the thermo-simulation quasi-static compression and split Hopkinson pressure bar high strain rate compression. The results show that the difference between the quasi-static and high strain rate compression of the zirconium alloy is associated with the last deformation stage. Under quasi-static compression, dislocation-pile-up is the main plastic deformation mechanism of the zirconium alloy, leading to the gradual increase of the cumulative misorientation in the deformed grain. However, under high strain rate compression, shear bands are the main plastic deformation mechanism of the zirconium alloy, leading to the decreasing cumulative misorientation in the deformed grain because the plastic deformation is accommodated partly by shear bands.
Keywords:zirconium alloy  strain rate  cumulative misorientation
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