摘要
采用扫描电镜、透射电镜、硬度测试等手段研究了回归时间对试验铝合金的微观组织以及硬度、电导率、力学性能、断裂韧性等性能的影响。结果表明,三级时效态合金的强度峰值、硬度峰值、导电率和断裂韧性均超过了未回归时效态合金与T6态;回归的过程是晶内析出相GP区部分会先产生回溶,然后不断长大直至转变为η'相,晶界析出相逐渐粗化且不连续;再时效过程中,断裂韧性和导电率均随回归时间的延长而不断增强,合金的断裂模式由沿晶断裂逐渐演变为穿晶韧窝断裂。
The effects of retrogression and reaging(RRA)on the hardness,conductivity,tensile property and fracture toughness of alu-minum alloy 7×××were investigated by aid of scanning electron microscopy,trasmission electron microscopy,hardness,conductivity,tensile and toughness tests.The results show that the peak strength,the peak hardness,the conductivity and the toughness of reaging testing aluminum alloy are larger than the non-retrogression and T6 testing alloys.During the retogression treating,one part of GP zone dissolves into Al matrix and the other grows,and then transforms intoη°phase with the retrogression time elongating.With the retrogression time elongating,the main fracture mechanism changes from the intergranular fracture to transgranular fracture.
作者
曾翠婷
Zeng Cuiting(ZYF Lopsking Aluminum Co,.Ltd,Suzhou 215143,China)
出处
《铝加工》
CAS
2021年第4期15-18,共4页
Aluminium Fabrication
关键词
三级时效处理
硬度
电导率
拉伸性能
断裂韧性
three-stage aging treatment
hardness
electrical conductivity
tensile properties
fracture toughness
