Microstructure formation and liquid structural evolution of Ni-Al intermetallic compound

被引：0

作者：

Zhao Y.-M. ^{[1
]}

Zeng L. ^{[1
]}

Xia M.-X. ^{[1
]}

Yu P.-F. ^{[1
]}

Li J.-G. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 08期

基金：

中国国家自然科学基金;

关键词：

intermetallic compounds; microstructure; solute redistribution; structural evolution; synchrotron radiation;

D O I：

10.11817/j.ysxb.1004.0609.2022-43664

中图分类号：

学科分类号：

摘要：

Ni-Al intermetallic alloys have advantages of lower density, higher strength and hardness and more corrosion resistance compared with conventional metals and alloys, and have a wide range of applications in aerospace, automotive and energy fields. However, the structural "heritability" between liquid structures and intermetallic compounds is still not clearly understood, which is closely related to the alloy properties. Here, in situ observation of the solidification process for Ni19.47Al80.53 intermetallic compound alloy was investigated using synchrotron radiation X-ray imaging and high-energy X-ray diffraction techniques. Visualization of solute distribution and liquid structure evolution is obtained by the micro-element method. The results show that there is solute-directed movement during solidification. The growth of intermetallic compound microstructure is closely related to the evolution of clusters in the liquids. The enrichment of icosahedral-like clusters in the Al-rich liquid phase has a dominant effect on the growth of the α(Al) phase. While the enrichment of crystal-like clusters near the Al3Ni intermetallic compound phase has a dominant effect on the growth of the Al3Ni phase. The findings in this work extend the understanding of the atomic mechanism for the microstructure evolution of intermetallic compounds and provide theoretical guidance for controlling and predicting the solidification structure. © 2023 Central South University of Technology. All rights reserved.

引用

页码：2549 / 2562

页数：13

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