轧制变形和双级时效对7050铝合金组织和性能的影响  

Influence of Rolling Deformation and Double Aging on Microstructure and Properties of 7050 Aluminum Alloy

作　　者：王勇[1,2] 

机构地区：[1]重庆电子工程职业学院汽车工程系,重庆401331 [2]重庆大学机械工程学院,重庆400044

出　　处：《热加工工艺》2015年第17期142-145,148,共5页Hot Working Technology

摘　　要：通过金相观察、电子显微镜扫描、拉伸测试、电子背散射衍射技术等研究了不同轧制变形和双级时效处理对7050铝合金微观组织和性能的影响。结果表明:多道次小压下量轧制的合金可以获得相对均匀的变形组织。双级时效后,热轧70%的合金屈服强度、抗拉强度和伸长率分别为483、552 MPa和17.5%。随变形量增加,晶内析出相以亚稳相η′和平衡相η-Mg Zn2为主,析出相的密度和分布均匀性增加。The effects of different rolling deformations and double aging on the microstructure and properties of 7050 aluminum alloy were studied by metallographic observation, scanning electron microscopy, tensile testing, electron backscatter diffraction technique. The results demonstrate that the alloy of multi-passes rolling with slight deformation can obtain a relatively uniform deformation microstructure. After double aging, the yield stress, the tensile stress and the elongation of 7050 aluminum alloy are 483,552 MPa and 17.5%, respectively. With the deformation increasing, the metastable phase η＇ and the equilibrium phase η-MgZn2 become major precipitation phases of grain interior, and the density and the distribution uniformity of precipitation phase increase.

关 键 词：7050 铝合金 轧制工艺 双级时效 

分 类 号：TG339[金属学及工艺—金属压力加工]