中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 1 January 2022 |
（1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;
3. Anhui Aluminum Matrix Composites Engineering Research Centre, Huaibei 235099, China）
Abstract:The high temperature (HT) thermal stability and mechanical properties of Al-5%Cu (AC) and Al-5%Cu- 0.2%Mn-0.2Zr% (ACMZ) alloys from 573 to 673 K were systematically studied. The results displayed that micro-alloying additions of Zr and Mn elements have presented a significant role in stabilizing the main strengthening metastable θ′ precipitates at a temperature as high as 573 K. Simultaneously, the HT tensile test demonstrated that ACMZ alloy retained their strength of (88.6±8.8) MPa, which was much higher than that of AC alloy ((32.5±0.8) MPa) after the thermal exposure at 573 K for 200 h. Finally, the underlying mechanisms of strength and ductility enhancement mechanism of the ACMZ alloy at HT were discussed in detail.
Key words: Al-Cu alloy; micro-alloying; thermal stability; precipitate evolution; high-temperature mechanical properties
