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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)。
The compressive compression tests of pure titanium cylindrical samples were carried out by dynamic plastic deformation (DPD) and quasi-static compression deformation (QSC), and the evolution of pure titanium deformation twins and microstructures under different strain rates was studied. The results show that the deformation mechanisms of the two deformation modes are similar, the deformation twin is dominant at low strain, and the dislocation slip predominated after twin saturation. The high strain rate promotes the formation of deformation twins and stimulates the {4211} While the critical strain of transformation mechanism was advanced to 0.2. The adiabatic shear band (ASB) of pure titanium appeared at high strain rate and high strain (ε≥0.6).