First-Principles Study of a Tungsten-Free γ-γ′ Co-Al-Mo-Nb Class Cobalt-Based Superalloy and the Alloying Effect of Ti Addition

被引：4

作者：

Wang, Zihan ^{[1
]}

Zhang, Jianxin ^{[1
]}

Zhang, Youjian ^{[1
]}

Jin, Huixin ^{[1
]}

Zhang, Wenyang ^{[1
]}

机构：

[1] Shandong Univ, Sch Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2020年 / 89卷 / 12期

基金：

中国国家自然科学基金;

关键词：

THERMODYNAMIC PROPERTIES; TEMPERATURE; DEFORMATION; STRENGTH; HARDNESS; CREEP;

D O I：

10.7566/JPSJ.89.124714

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The tungsten-free gamma-gamma' Co-Al-Mo-Nb class cobalt-based superalloy and the alloying effect of Ti were studied by analyzing the phase stability, electronic structure and elastic properties, using first-principles study. It is found that the addition of Nb and Ti decreases the formation enthalpy of the system and stabilizes Co-3 (Al, Mo) phase. For Co-Al-Mo- Nb alloys, Nb prefers to occupy Mo-4 site, while for Co-Al-Mo-Nb-Ti alloys, Nb and Ti prefer Mo-3 site. Moreover, the addition of Nb and Ti in Co-3(Al, Mo) declines the resistance to monoclinic shear in (100) plane and the hardness but improves the ductility which even exceeds that of Ni3Al. As this new alloy solves the problems of high density and low ductility of Co-3(Al, W), it makes Co-based superalloy possess a better prospect.

引用

页数：6

共 32 条

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