Enhanced strength in Co-free Ni47.5-xFe25Cr25AlxTi2.5 high entropy alloys via introducing dual precipitates

Xiaotao Xu; Yuhong Zhao; Huanqing Li; Xiaobo Zhang; Yue Pan; Shuai Wang; Hua Hou

Journal of Materials Research and Technology (Jul 2023)

Enhanced strength in Co-free Ni47.5-xFe25Cr25AlxTi2.5 high entropy alloys via introducing dual precipitates

Xiaotao Xu,
Yuhong Zhao,
Huanqing Li,
Xiaobo Zhang,
Yue Pan,
Shuai Wang,
Hua Hou

Affiliations

Xiaotao Xu: School of Materials Science and Engineering, Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, North University of China, Taiyuan, 030051, China
Yuhong Zhao: School of Materials Science and Engineering, Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, North University of China, Taiyuan, 030051, China; Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Institute for Materials Intelligent Technology, Liaoning Academy of Materials, Shenyang, 110010, China; Corresponding author. 3 Xueyuan Road, Taiyuan, Shanxi, 030051, China.
Huanqing Li: School of Materials Science and Engineering, Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, North University of China, Taiyuan, 030051, China
Xiaobo Zhang: School of Materials Science and Engineering, Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, North University of China, Taiyuan, 030051, China
Yue Pan: School of Materials Science and Engineering, Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, North University of China, Taiyuan, 030051, China; School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China
Shuai Wang: School of Materials Science and Engineering, Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, North University of China, Taiyuan, 030051, China; Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082, China
Hua Hou: School of Materials Science and Engineering, Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials, North University of China, Taiyuan, 030051, China; School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China

Journal volume & issue: Vol. 25
pp. 5663 – 5673

Abstract

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Synergistic strengthening mechanisms (e.g. solid solution strengthening, grain/twin boundary strengthening, dislocation strengthening, and precipitation strengthening) have been shown to effectively achieve a balance between strength and ductility of mechanical properties of metal materials. In this study, Co-free AlxNi47.5-xFe25Cr25Ti2.5 high entropy alloys (HEAs) mainly strengthened by grain boundary/twin-precipitation were successfully prepared by combining rolling and annealing. The phase-field method was used to demonstrate that twins enhance the Hall-Petch effect by introducing additional twin boundaries. Only a small amount of lamellar L12 phase is precipitated in the aged Al2.5 HEA. The tensile strength is 1086 MPa and the elongation is 30.8%. With the increase of Al content, the volume fraction of L12 phase in the alloy increases, and the bulk B2 phase is precipitated. When the Al content increases to 7.5 at. %, the strength of the alloy increases to 1757 MPa, but the plasticity is catastrophically reduced to only 3.4%. The excellent strength of aged Al7.5 HEA is mainly due to the good combination of grain/twin boundary strengthening and precipitation strengthening.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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