A bimodal γ′ phase precipitation in Ni-Al alloys with preaging and continuous cooling: phase-field simulation

被引：2

作者：

Chen, Xi ^{[1
,2
]}

Li, Yongsheng ^{[1
,2
]}

Yan, Zhengwei ^{[1
,2
]}

Shi, Shujing ^{[1
,2
]}

Wang, Dong ^{[1
,2
]}

Lai, Kunwu ^{[1
,2
]}

Chen, Jing ^{[1
,2
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China

[2] MIIT Key Lab Adv Metall & Intermetall Mat Technol, Nanjing 210094, Peoples R China

来源：

MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING | 2021年 / 29卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Ni– Al alloys; bimodal γ ′ phase; continuous cooling; kinetics; phase-field;

D O I：

10.1088/1361-651X/abd3b0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A bimodal precipitation with primary and secondary gamma ' phase in Ni-17 at.% Al alloys was produced via preaging and continuous cooling. The morphology and composition evolution of gamma ' phase during cooling process were studied by using phase-field simulation, the bimodal precipitation mechanism was declared. The content of Al in secondary gamma ' phase is lower than the equilibrium composition because of the slower atom diffusion during continuous cooling. With the increase of cooling rates, the volume fraction and average radius of primary and secondary gamma ' phase are reduced, the number density of secondary gamma ' phase increases; in addition, the inter-distance of particle size distribution of primary and secondary gamma ' phase is widen. A long time of isothermal preaging reduces the precipitation and growth of secondary gamma ' phase. The hybrider precipitates with bimodal size distribution of gamma ' phase help optimizing the precipitates morphology of nickel based alloys.

引用

页数：17

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