L12-Type Ordered Structures in NiCrAlFe Precision Resistance Alloy

被引：0
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作者：
Huang, Shudong [1 ]
Wang, Yong [1 ]
Yang, Xianjun [2 ]
Xu, Yonghong [2 ]
机构：
[1] College of Materials Science & Engineering, International Joint Laboratory for Light Alloys, Ministry of Education, Chongqing University, Chongqing,400044, China
[2] Chongqing Chuanyi Metallic Functional Materials Co., Ltd, Chongqing,400702, China
来源：
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2020年 / 49卷 / 12期
关键词：
Using the first-principles pseudopotential plane-wave method; the binding energies; density of states and lattice constants of a NiCrAlFe precision resistance alloy were calculated based on the disordered solid solution and L12-type ordered structures. The microstructure of the alloy was analyzed by high-resolution transmission electron microscope (HRTEM). Also; the electrical resistance of the alloy was measured after solid-solution and aging treatment. From the binding energy point of view; the L12-type ordered structure is more stable than the disordered solid solution structure. The calculation results of density of states and partial density of states show that in the L12-type ordered structure; Ni; Cr; Al and Fe atoms bond with each other more strongly than they do in the disordered solid solution structure. Thus the stability of the alloy is improved. In fact; L12-type ordered structure is revealed by HRTEM in the as-aged alloy; and its lattice parameters are close to the calculated results. According to the comparison of density of states at the Fermi level of different structures; the electrical conductivity of the alloy decreases due to the formation of L12-type ordered structure compared with that of the disordered solid solution structure; which is consistent with the experimental results. © 2020; Science Press. All right reserved;
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页码：4159 / 4165
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