7050铝合金双级双峰时效强化机理  

Strengthening Mechanism of Two-Stage Double-Peak Aging in 7050 Aluminum Alloy

作　　者：任建平[1] 宋仁国 Ren Jianping;Song Renguo(Institute of Intelligent Manufacturing Equipment,Taizhou Vocational College of Science and Technology,Taizhou 318020,China;School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou 213164,China)

机构地区：[1]台州科技职业学院智能制造装备研究所,浙江台州318020 [2]常州大学材料科学与工程学院,江苏常州213164 [3]常州大学材料表面科学与技术重点实验室,江苏常州213164

出　　处：《稀有金属材料与工程》2020年第4期1159-1165,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China (50771093, 51371039)。

摘　　要：系统地研究了7050铝合金双级双峰时效微观组织对强度和硬度的影响。结果表明,7050铝合金的双级时效出现了双峰现象,第2峰的硬度和强度均略高于第1峰。高分辨透镜(HRTEM)观察表明,第2峰值的硬度和强度的增加是由于一定数量的η’相数量的增加引起的。此外,η’相和GP区的共同作用优于GP区单独的效果。The effects of microstructure evolution on the strength and hardness of 7050 aluminum alloy during a two-stage aging process were examined.The results indicate that a double-peak phenomenon occurs in the double-stage aging of the 7050 aluminum alloy.The hardness and strength of the second aging peak slightly exceed those of the first peak.Transmission electron microscopy observations indicate that the increase in the hardness and strength for the second aging peak is caused by an increase in the amount of theη’phase.Additionally,the synergistic effect of theη’phase and GP zones surpasses the effect of the GP zones alone.

关 键 词：7050铝合金 双级双峰时效 机械强度 微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]