Static softening behaviors of 7055 alloy during the interval time of multi-pass hot compression

• Published in: Rare metals 2013-06, Vol.32 (3), p.241-246
• Main Authors: Yan, Liang-Ming, Shen, Jian, Li, Jun-Peng, Mao, Bai-Ping
• Format: Article
• Language: English
• Subjects: Aluminum base alloys; Biomaterials; Chemistry and Materials Science; Delay; Energy; Intervals; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Nucleation; Physical Chemistry; Recovery; Recrystallization; Reduction; Softening; Stresses; 合金; 延迟时间; 热压缩; 行为; 透射电子显微镜; 间隔时间; 静态再结晶; 静态软化
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-013-0065-6

Multipass plain strain compression test of 7055 alloy was carried out on Gleeble 1500D thermomechanical simulator to study the effect of interval time on static softening behavior between two passes. Microstructural features of the alloy deformed with delay times varying from 0 to 180 s after achieving a reduction of ,-~52 % in the 13 stages was investigated through TEM and EBSD observations. The 14th pass of peak stresses after different delay times were gained. The peak stress decreases with the interstage delay time increasing, but the decreasing trend is gradually slower. Static recovery, metadynamic recrystallization, and/or static recrystallization can be found in the alloy during two passes. The recovery and recrystallization degree increases with longer interstage delay time. The static recovery is the main softening mechanism. Subgrain coalescence and subgrain growth together with particle-stimulated nucleation are the main nucleation mechanisms for static recrystallization.