中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 1 January 2024 |
（1. Additive Manufacturing Institute, College of Mechatronics & Control Engineering, Shenzhen University, Shenzhen 518060, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China;
3. Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China;
4. State Key Laboratory of High Performance Complex Manufacturing, Light alloys Research Institute, Central South University, Changsha 410083, China;
5. School of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:A series of TiAlCrMn high entropy alloys (HEAs) with variable atomic ratios of Al, Cr, and Mn were prepared using vacuum melting. High-temperature oxidation behaviors and mechanical properties were investigated before and after heat treatment. The oxidation mass gain rate is declined dramatically with increasing Al, Cr, and Mn element contents. Enhanced oxidation resistance is attributed to a continuously dense (Al,Cr)-rich oxidation layer, which can hinder the inter-diffusion of O and alloying elements. Furthermore, microhardness increases monotonously with increasing Al, Cr, and Mn element contents of the alloys before and after heat treatment. Grain coarsening can result in lower microhardness, but precipitation strengthening contributes to higher hardness of the alloys with high alloying element contents. Meanwhile, deformation-induced strengthening also contributes to higher compressive strength. The value after heat treatment at 500 °C is lower than that of as-cast samples while an increased value occurs after heat treatment at 900 °C accompanied by sacrificing the malleability.
Key words: high entropy alloys (HEAs); oxidation resistance; microstructural evolution; microhardness; compressive strength
