铸造ZL109铝合金和变形7050铝合金半固态成形过程组织演变的对比研究  

Comparative Study on the Structure Evolution of ZL109 Alloy and 7050 Alloy in the Semisolid Forging Process

作　　者：翟彦博[1] 刘昌明[1] 王开[1] 韩兆堂[1] 

机构地区：[1]重庆大学机械工程学院

出　　处：《特种铸造及有色合金》2007年第S1期439-443,共5页Special Casting & Nonferrous Alloys

摘　　要：对比研究了铸造109铝合金和变形7050铝合金在低过热法制备原始坯料、二次重熔、半固态锻造成形和热处理过程中组织演变特点。用低过热法制备原始坯料,在ZL109合金中得到了细小的共晶硅片,在7075合金中得到了非枝晶初生α相;在二次重熔过程中,ZL109铝合金中的共晶硅进一步粒状化,7050合金初生α晶粒更加均匀、圆整;锻造成形过程中,ZL109铝合金中的初生α相和共晶体在挤压力作用下发生部分分离,而7050合金中,挤压力使初生α晶粒发生了碰撞连结。经热处理后,ZL109铝合金中的Si相呈块状状较均匀地弥散在α相网状结构中,而7050合金经热处理后,α晶界共晶相减少,重结晶过程使α晶粒细化并呈现多边形化。The structure evolution of ZL109 alloy and 7050 alloy was studied during the process of preparing the raw billet by low super heat casting, remelting,semisolid forming and heat treatment.The thin and symmetrical structure were obtained by using low super heat casting process. The eutectic that lied inside the raw billet of ZL109 alloy melted and came into being liquid phase in the process of remelting, but to the 7050 alloy, the structure of intergranular was fist melted that made grain more uniform and smooth.In the process of semisolid forming,the first αphase and eutectic inside the ZL109 alloy were separated partly and the grain inside the 7050 alloy was drew out along the way of the stress.After heat treated,the sohericity Si phase inside the ZL109 alloy diffused equably in the firstαphase,but to the 7050 alloy,the βphase was discovered in the intergranular and the grain was no longer smoothly like before.

关 键 词：ZL109合金 7050合金 原始坯料 低过热法 二次重熔 组织演变 

分 类 号：TG27[金属学及工艺—铸造]