Ge在Al-3.5Cu合金中的微合金化作用  

Micro-alloying Effects of Ge in Al-3.5Cu Aluminum Alloy

作　　者：范春平[1] 郑子樵[1] 罗先甫[1] 廖忠全[1] 程彬[1] 

机构地区：[1]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2014年第7期1649-1654,共6页Rare Metal Materials and Engineering

摘　　要：通过显微硬度测试、常规拉伸性能测试、透射电镜观察等研究了微量Ge(0.21%)在Al-3.5Cu(质量分数,%)合金中的微合金化作用。结果表明:175℃时效时,由于Ge与空位间有很强的相互作用,Ge的添加抑制了GP区的形成,也使随后析出的θ′′和θ′的密度减少,含Ge合金时效响应速率减小,峰值硬度和强度降低。200℃时效时,由于时效温度很高,有利于空位扩散,从而释放了Ge对空位的钉扎,使含Ge合金中总的可动空位数量增多,有利于过饱和固溶体的分解,因此含Ge合金时效响应速率反而有所加快,硬化、强化效果增大。The effects of trace Ge additions （0.21%） on microstructure and mechanical properties of Al-3.5Cu （mass fraction, %） aluminum alloy were investigated by the micro-hardness test, tensile test and transmission electron microscopy （TEM） observation. The results indicate that due to the strong interaction of Ge with vacancies, the addition of trace Ge inhabits the formation of GP zones, and decreases the density of θ″ and θ′, and it further decreases the aging response rate and reduces the peak-aging hardness and tensile strength of Al-3.5Cu-0.21Ge alloy aged at 175 ℃. When aged at 200 ℃, the vacancies diffuse fast and the interaction with Ge is released, and the number of free vacancies increases a lot which resolves the supersaturated solid solution easily. Therefore, the aging response rate increases and the peak-aging strength as well as hardness increases for the alloy containing Ge.

关 键 词：AL-CU合金 Ge 微合金化 拉伸性能 微观组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]