Optimizing Mechanical Properties of AlCoCrFeNiTix High-Entropy Alloys by Tailoring Microstructures

doi:10.1007/s40195-012-0174-5

Acta Metallurgica Sinica (English Letters) ›› 2013, Vol. 26 ›› Issue (3): 277-284.DOI: 10.1007/s40195-012-0174-5

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Optimizing Mechanical Properties of AlCoCrFeNiTi_x High-Entropy Alloys by Tailoring Microstructures

Yinfeng WANG¹⁾, Shengguo MA²⁾,Xiaohua CHEN²⁾, Juyan SHI¹⁾, Yong ZHANG²⁾, Junwei QIAO^1,3)

1) College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024,China
2) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
3) Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

Received:2012-10-15 Revised:2012-12-28 Online:2013-06-25 Published:2013-05-06
Contact: Juyan SHI
Supported by:
National Natural Science Foundation of China (No. 51101110), the Youth Science Foundation of Shanxi Province, China (No.~2012021018-1), Research Project Supported by Shanxi Scholarship Council of China (No. 2012-032) and State Key Lab of Advanced Metals and Materials (Grant No. 2011-Z06).

Abstract

Abstract:

The effects of Ti additions and the heat treatment on the mechanical properties of AlCoCrFeNiTi_x (x = 0, 0.2, 0.3, 0.4 and 0.5) high-entropy alloys (HEAs) were studied. The results show that the dendrite phase with a body-centered-cubic (bcc) structure transforms into the interdendrite phase with a new bcc structure. With the increase of the Ti contents and heat-treatment temperature, the average hardness and yield strengths are greatly improved, and the highest hardness and yielding strength are 583 HV and 2.07 GPa, respectively in the investigated HEA system. The as-cast and annealed HEAs exhibit excellent mechanical properties, combining with high yielding strength and plasticity. The solid solution strengthening mechanism of Ti additions is responsible for the strengthening effect of AlCoCrFeNiTi_x HEAs.

Key words: High-entropy alloy, Microstructure, Compressive property, Hardness, Heat treatment

Yinfeng WANG, Shengguo MA,Xiaohua CHEN, Juyan SHI, Yong ZHANG, Junwei QIAO. Optimizing Mechanical Properties of AlCoCrFeNiTi_x High-Entropy Alloys by Tailoring Microstructures[J]. Acta Metallurgica Sinica (English Letters), 2013, 26(3): 277-284.

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Optimizing Mechanical Properties of AlCoCrFeNiTi_x High-Entropy Alloys by Tailoring Microstructures

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