Faceted Kurdjumov-Sachs interface-induced slip continuity in the eutectic high-entropy alloy, AlCoCrFeNi2.1

Ting Xiong ¹Wenfan Yang ¹Shijian Zheng ²Zhaorui Liu ³Yiping Lu ⁴Ruifeng Zhang ³Yangtao Zhou ⁵Xiaohong Shao ⁵Bo Zhang ⁵Jun Wang ⁶Fuxing Yin ⁷Peter K.Liaw ⁸Xiuliang Ma⁹

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作者信息

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;School of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
3. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;Center for Integrated Computational Materials Engineering (International Research Institute for Multidisciplinary Science) and Key Laboratory of High-Temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology), Beihang University, Beijing 100191,China
4. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering Dalian University of Technology, Dalian 116024, China
5. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
6. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
7. Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
8. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996, USA
9. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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Abstract

Recently,the eutectic high-entropy alloy (EHEA),AlCoCrFeNi2.1,can reach a good balance of strength and ductility.The dual-phase alloy exhibits a eutectic lamellar microstructure with large numbers of interfaces.However,the role of the interfaces in plastic deformation have not been revealed deeply.In the present work,the orientation relationship (OR) of the interfaces has been clarified as the Kurdjumov-Sachs (KS)interfaces presenting 〈111〉B2‖〈110〉FCC and {110}B2‖{111 }FCC independent of their morphologies.There exist three kinds of interfaces in the EHEA,namely,(321)B2]](112)FCC,(01(1))B2‖(33(2))FCC,and (23(1))FCC‖(552)FCC.The dominating (321)FCC‖(112)Fcc interface and the secondary (01(1))B2‖(33(2))FCC interface are both non-slip planes and atomistic-scale faceted,facilitating the nucleation and slip transmission of the dislocations.The formation mechanism of the preferred interfaces is revealed using the atomistic geometrical analysis according to the criteria of the low interfacial energy based on the coincidence-site lattice (CSL) theory.In particular,the ductility of the dual-phase alloy originates from the KS interface-induced slip continuity across interfaces,which provides a high slip-transfer geometric factor.Moreover,the strengthening effect can be attributed to the interface resistance for the dislocation transmission due to the mismatches of the moduli and lattice parameters at the interfaces.

Key words

High-entropy alloy/AlCoCrFeNi2.1/Interface/Kurdjumov-Sachs (KS)/Dislocation

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基金项目

出版年

2021

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

被引量1

参考文献量57

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