A2017合金半固态压缩变形力学特性

采用Gleeble 15 0 0热模拟机 ,对SCR (shearing/coolingroll)技术制备的A2 0 17半固态合金和常规铸造A2 0 17合金在不同变形温度和不同变形速率下进行半固态压缩实验 ,研究了A2 0 17合金半固态压缩变形的力学特性。实验结果表明 ,相同变形温度下 ,SCR技术制备的A2 0 17半固态合金半固态压缩变形抗力低于常规铸造A2 0 17合金半固态压缩变形抗力 ,这主要是SCR技术制备的A2 0 17半固态合金具有的均匀的近球形晶和共晶液相组成的组织优于常规铸造的枝晶组织 ,其压缩变形机制不同于常规铸造枝晶的压缩变形机制。实验结果还表明 ,SCR技术制备的A2 0 17半固态合金半固态压缩变形抗力 ,对压缩变形温度和变形速率具有敏感性 ,随着变形温度降低或者变形速率升高 ,变形抗力增加。

Mechanical properties of A2017 alloys compression deformation in semi-solid state

A2017 alloys attained by conventional casting and shearing/cooling roll (SCR) technology were compressed in semisolid state at different deformation temperatures and different deformation rates by means of Gleeble-1500 thermal-mechanical simulator. The mechanical properties of A2017 alloys were studied. The experimental results show that the resistance to deformation of A2017 alloys manufactured by SCR technology in semisolid state is lower than that of conventional casting A2017 alloys in semisolid state, which is that microstructure of A2017 alloy manufactured by SCR technology excelled that of conventional casting A2017 alloys in solid state or semisolid state, and the deformation mechanisms of two materials are also different. The experimental results indicate also that resistance to deformation of A2017 alloy manufactured by SCR technology in semisolid state increases as deformation temperature decreasing or deformation rate rising.