高应变速率对纯钛塑性变形的影响
发布时间：2018-09-01 10:26
【摘要】：利用动态塑性变形(DPD)和准静态压缩变形(QSC)技术对纯钛圆柱样品进行对比压缩试验,研究了不同应变速率下纯钛形变孪晶和微结构演变。结果发现:2种变形方式的变形机制相似,低应变时以形变孪生为主,孪生饱和后转变为位错滑移主导;高应变速率促进了形变孪晶的产生,激发{4211}压缩孪晶的形成,同时使变形机制转变临界应变提前至0.2;纯钛在高应变速率和高应变(ε≥0.6)下出现绝热剪切带(ASB)。
[Abstract]:Dynamic plastic deformation (DPD) and quasi-static compression deformation (QSC) techniques were used to study the deformation twin and microstructure evolution of pure titanium at different strain rates. The results show that the deformation mechanism of the two deformation modes is similar, the twinning is dominated by deformation twinning at low strain, and the twinning changes to dislocation slip after saturation, and high strain rate promotes the formation of deformation twins and excites the formation of {4211} compression twins. At the same time, the critical strain of deformation mechanism transition was advanced to 0.2, and the adiabatic shear band (ASB). Appeared in pure titanium at high strain rate and high strain (蔚 鈮，
本文编号：2216911
[Abstract]:Dynamic plastic deformation (DPD) and quasi-static compression deformation (QSC) techniques were used to study the deformation twin and microstructure evolution of pure titanium at different strain rates. The results show that the deformation mechanism of the two deformation modes is similar, the twinning is dominated by deformation twinning at low strain, and the twinning changes to dislocation slip after saturation, and high strain rate promotes the formation of deformation twins and excites the formation of {4211} compression twins. At the same time, the critical strain of deformation mechanism transition was advanced to 0.2, and the adiabatic shear band (ASB). Appeared in pure titanium at high strain rate and high strain (蔚 鈮，
本文编号：2216911
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