中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 7 July 2023 |
（1. State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China;
2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
3. Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW 2052, Australia;
4. Light Alloys Research Institute, Central South University, Changsha 410083, China）
Abstract:To achieve higher performance of aluminum matrix composites (AMCs), high-entropy alloy particles (HEAp)-reinforced AMCs sheets were processed via asymmetric rolling (AR, 298 K) and asymmetric cryorolling (ACR, 77 K) methods. The mechanical properties and microstructure of the HEAp/AMCs were analyzed by tensile tests, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results suggest that ACR improved the mechanical properties of HEAp/AMCs to a higher degree than AR. The ultimate tensile strength (UTS) of ACR 3 wt.% HEAp/AMCs reached 253 MPa, which was 13.5% higher than that achieved with AR. ACR resulted in fewer microvoids, finer grain sizes, and higher dislocation density in HEAp/AMC sheets compared to AR. Such a reduction of defects during ACR can be attributed to the volume shrinkage effect of the HEAp/AMCs in the cryogenic environment.
Key words: aluminum matrix composites; Al0.5CoCrFeNi high-entropy alloy particles; asymmetric cryorolling; grain size; micro defects
