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首页> 外文会议>International Conference on Proceeding amp; Manufacturing of Advanced Materials; 20060704-08; Vancouver(CA) >Effect of Strain Rates on the Transformation Behavior of Ni-Ti Alloy
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Effect of Strain Rates on the Transformation Behavior of Ni-Ti Alloy

机译：应变速率对Ni-Ti合金相变行为的影响

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摘要

In order to clarify the effect of strain rates on phase transformation behaviors of Ni-Ti alloy, a compressive test using a cylindrical specimen of polycrystalline Ni-Ti alloy of Ti-50.69 at% Ni was carried out at a high strain rate and a low strain rate. The transformation temperatures were determined by a differential scanning calorimeter (DSC) using a sample cut from a compressed specimen. The transformation temperatures of the specimens before deformation were M_s= 303 K, M_f= 287 K, A_s= 297 K and A_f= 319 K, respectively. The compressive test was carried out using specimen heated from liquid nitrogen temperature to room temperature. A universal testing machine as a static test apparatus and a Split Hopkinson Bar apparatus for a dynamic test were used. The specimen had a reoriented martensite phase after deformation because the superelastic effect was not observed upon unloading. Two reverse transformations during heating and a forward transformation during cooling were observed by DSC measurement. The first reverse transformation corresponds to that of thermal-induced martensite by immersion in liquid nitrogen and the second reverse transformation corresponds to that of reoriented martensite with slips in a polycrystalline matrix introduced by plastic deformation. The reverse transformation of the martensite phase with a slip exhibited strong strain rate dependency. Plastic strains and strain rate had strong influence on the shape recovery. The interaction between the temperature elevation by a conversion of plastic work and slip generated by dynamic plastic deformation is a complicated problem.
机译：为了弄清楚应变速率对Ni-Ti合金相变行为的影响，使用了Ti-50.69 at％Ni的多晶Ni-Ti合金圆柱形试样以高应变速率和低应变进行了压缩试验。应变率。通过差示扫描量热仪（DSC），使用从压缩样品上切下的样品，确定转变温度。样品在变形前的转变温度分别为M_s = 303 K，M_f = 287 K，A_s = 297 K和A_f = 319K。使用从液氮温度加热到室温的样品进行压缩试验。使用了作为静态测试设备的通用测试机和用于动态测试的Split Hopkinson Bar设备。试样变形后具有重新取向的马氏体相，因为在卸载时未观察到超弹性效应。通过DSC测量观察到加热期间的两个反向转变和冷却期间的正向转变。第一反向转变对应于通过浸入液氮中的热诱导马氏体的相变，第二反向转变对应于在塑性变形引入的多晶基体中具有滑移的取向马氏体的相变。马氏体相的滑移的逆相变表现出强烈的应变率依赖性。塑性应变和应变速率对形状恢复有很大影响。塑性功转换引起的温度升高与动态塑性变形产生的滑移之间的相互作用是一个复杂的问题。

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