The peculiar temperature and orientation dependence of L12-type Co74Ni3Ti23 single crystals
The peculiar temperature and orientation dependence of L12-type Co74Ni3Ti23 single crystals
复制标题
L12型Co74Ni3Ti23单晶特有的温度和取向依赖性
DOI：
10.1080/01418618908205066
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
S. Ono
中科院分区：
文献类型：
--
作者：
Yi Liu;T. Takasugi;O. Izumi;S. Ono
本文研究了L_（12）型Co_（74）Ni_（3Ti_（23））单晶在压缩试验中的流变行为与取向、试验温度和应变速率的关系。测得的临界分辨剪切应力（CRSS）显示出最小值约473 K（表示为T B）和最大值约1000 K（表示为Tp）。在T B以下和T p以上观察到CRSS的负温度依赖性，滑移迹线分析表明，（111）主八面体滑移面在T_p以下起作用，（111）和（001）滑移面在T_p附近和T_p以上起作用。对于（111）和（001）滑移的混合滑移，具有正相关性。提出了一个模型，包括一个热激活过程的superdislocation核心过渡从固着段到glissile段的CRSS在低温下的温度和取向的依赖性进行解释。方向依赖于…
Abstract The flow behaviour of L12-type Co74Ni3Ti23 single crystals has been investigated in compression tests as a function of orientation, test temperature and strain rate. The measured critical resolved shear stress (CRSS) shows a minimum around 473 K (denoted as T b) and a maximum around 1000 K (denoted at T p). A negative temperature dependence of the CRSS is observed below T b and above T p, and a positive temperature dependence of the CRSS is observed between T b and T p. Slip trace analysis shows that the (111) primary octahedral slip plane is operative below T p and both (111) and (001) slip planes are activated around and above T p. The CRSS is almost strain-rate independent for (111) slip and has a positive dependence for mixed (111) and (001) slip. A model involving a thermally activated process of superdislocation core transition from sessile segments to glissile segments is proposed to explain the temperature and orientation dependence of the CRSS at low temperatures. The orientation depende...