Coherent interface driven super-plastic elongation of brittle intermetallic nano-fibers at room temperature

Eun-Ae Choi ¹Seung Zeon Han ¹Hyung Giun Kim ²Jee Hyuk Ahn ¹Sung Hwan Lim ³Sangshik Kim ⁴Nong-Moon Hwang ⁵Kwangho Kim ⁶Jehyun Lee⁷

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作者信息

1. Department of Special Alloy,Korea Institute of Materials Science,Changwon 642-831,Korea
2. Gangwon Regional Division,Korea Institute of Industrial Technology,Gangneung 210-340,Korea
3. Department of Advanced Materials Science & Engineering,Kangwon National University,Chuncheon 200-701,Korea
4. Department of Materials Science and Engineering,ReCAPT,Gyeongsang National University,Chinju 660-701,Korea
5. Department of Materials Science and Engineering,Seoul National University,Seoul 151-744,Korea
6. Department of Materials Science and Engineering,Pusan National University,Busan 46241,Korea
7. Department of Materials Science and Engineering,Changwon National University,Changwon 641-773,Korea
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Abstract

The intermetallic compound such as Ni2Si has a brittle nature.Therefore,monolithic intermetallic com-pounds have not yet been prepared by mechanical downsizing.During mechanical drawing of bulk Cu-Ni2 Si alloy at room temperature,we observed more than 400％plastic elongation of hard and brittle Ni2 Si intermetallic nano-fibers.The calculation based on the density functional theory reveals that the fully co-herent interface induces strain on the intermetallic compound surrounded by the matrix,and lowers the intrinsic stacking fault energy below the level required to break an interatomic bond.The new interface between the Ni2Si intermetallic and Cu matrix formed by the plastic deformation is as stable as the origi-nal coherent interface formed by precipitation,and the activation energy of the newly formed interface to slip is similar to that of the Cu matrix.All of these make plastic deformation of brittle Ni2Si intermetallic possible by slip without failure.

Key words

Ni2Si/Intermetallic compound/Plastic deformation/Precipitation/Brittle fiber/Interface/Density functional theory

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基金项目

National Research Foundation of Korea(2020M3D1A2098962)

National Research Foundation of Korea(2018R1A5A6075959)

National Research Foundation of Korea(2014M3A6B1060886)

Technology Innovation Program funded By the Ministry of Trade,Industry&Energy,Ko-rea(20010384)

Fundamental Research Program of the Korean Institute of Materials Science(PNK7730)

Cooperative pro-gram of Professional Development Consortium for Computational Materials Scientists in IMR,Tohoku University(20S0513)

出版年

2022

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量28

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