中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 3 March 2026 |
（a Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
b School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
c Physical-Technical Institute, National Academy of Science of Belarus, Minsk 2200084, Belarus）
Abstract:A novel method called thermomechanical treatment based on impact hydroforming (TTIHF) was proposed. The pre-deformation was achieved by using impact hydroforming (IHF) loading. The strengthening effect and mechanism of 2195 Al-Li alloy were investigated under various loading pre-deformation conditions. The results showed that the time for the alloy to reach peak aging was shortened under TTIHF. Compared with those of the pre-deformation method of stamping forming, the yield strength and tensile strength of the Al-Li alloy under TTIHF increased by 18.6% and 18.0%, respectively. The deformation caused by IHF loading resulted in a high density of dislocations, which served as nucleation sites for the precipitation of the T1 phase during aging. After TTIHF, the average diameter and thickness of the T1 phase in the alloy were smaller than those under other experiment conditions. Moreover, the density and distribution of the T1 phase were the highest and the most uniform.
Key words: Al-Li alloy; thermomechanical treatment; impact hydroforming; peak aging; strengthening mechanism; dislocation density
