Phase stability and magnetic properties in Co2Cr(Al,Si) shape memory alloys
Phase stability and magnetic properties in Co2Cr(Al,Si) shape memory alloys
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Co2Cr(Al,Si)形状记忆合金的相稳定性和磁性能
DOI：
10.1016/j.jmmm.2019.166311
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发表时间：
2020
影响因子：
2.7
通讯作者：
Kainuma Ryosuke
中科院分区：
文献类型：
--
作者：
Hirata Kenji;Xu Xiao;Omori Toshihiro;Kainuma Ryosuke
系统研究了Co2 Cr（Al，Si）形状记忆合金母相的相稳定性和磁性能。对于富Co的部分在化学计量组成附近，在1473 K的B2相的相边界与Co固溶体（A1）相平衡的确定和显示马氏体相变的成分也被确定在B2单相区域内。与Co-Cr-Al三元系相比，Si的加入大大扩展了B2单相区。由B2相在1473 K水淬过程中发生有序-无序转变而形成的L21相的居里温度和自发磁化强度分别为345-540 K和2.1-2.6 μB/f. u。分别自发磁化强度的值低于从广义Slater-Pauling规则和从头计算的预期。
The phase stability and magnetic properties of the parent phase in the Co2Cr(Al,Si) shape memory alloys were systematically investigated. For the Co-rich portion in the vicinity of stoichiometric composition, the phase boundaries of B2 phase in equilibrium with Co solid solution (A1) phase at 1473 K were identified and the compositions showing martensitic transformation were also determined within the B2 single-phase region. The addition of Si greatly expands the B2 single-phase region compared with that of the Co-Cr-Al ternary system. The Curie temperature and spontaneous magnetization of the L21phase, which is formed by the order-disorder transition from the B2 phase during water quenching from 1473 K, were 345–540 K and 2.1–2.6 μB/f.u., respectively. The values of spontaneous magnetization were lower than those expected from the Generalized Slater-Pauling rule and the ab-initio calculation.