Extra ordering of carbon atoms and mechanical properties of E21 Co3AlC based heat resistant alloys
Extra ordering of carbon atoms and mechanical properties of E21 Co3AlC based heat resistant alloys
复制标题
DOI：
10.1016/j.intermet.2005.11.023
复制
发表时间：
2006-01-01
期刊：
影响因子：
4.4
通讯作者：
Mishima, Yoshinao
中科院分区：
文献类型：
--
作者：
Kimura, Yoshisato;Sakai, Kiichi;Mishima, Yoshinao
通过在室温至1373 K的较宽温度范围内进行压缩试验，研究了E2（1）基Co 3AlC单晶和单相多晶Co 3AlC、Fe 3AlC合金的力学性能。研究了C的有序性对相稳定性和力学性能的影响，并结合反相界（APB）的形成进行了讨论。本文测定了Co_3AlC单晶的临界分辨剪切应力（CRSS）随温度的变化关系，以考虑其压缩力学行为。正如我们从E_2（1）′和L_1（2）′的相似性所预料的那样，Co_3AlC单晶中出现了屈服强度异常。施密德定律只适用于1173 ~ 1273 K的高温范围。采用透射电子显微镜（TEM）对样品进行了晶体学分析和显微组织观察。通过高分辨透射电子显微镜（HRTEM）观察发现，电子束辐照损伤可引起碳原子的无序化。(C)2006爱思唯尔有限公司版权所有。
Mechanical properties of E2(1) based Co3AlC single crystals and single-phase polycrystalline Co3AlC and Fe3AlC alloys have been evaluated by compression tests performed in a wide temperature range from room temperature to 1373 K. Effect of the ordering of C on the phase stability and mechanical properties has been investigated and discussed with the anti-phase boundary (APB) formation. Temperature dependence of critical resolved shear stress (CRSS) has been determined to consider the compressive mechanical behavior Of Co3AlC single crystal. Yield strength anomaly appears in Co3AlC single crystal as we have expected from the similarity between E2(1)' and L1(2). Schmid law is only applicable in a high temperature range between 1173 and 1273 K. Crystallographic analysis and microstructure observation were conducted using transmission electron microscopy (TEM). It was found that disordering of C atoms could be induced by the irradiation damage of electron beam after high-resolution transmission electron microscopy (HRTEM) observation. (C) 2006 Elsevier Ltd. All rights reserved.