轧制工艺对Al-Zn-Mg-Cu合金组织与性能的影响

Effect of Rolling Process on Microstructure and Properties of Al-Zn-Mg-Cu Alloy

利用金相显微镜、拉伸试验机、硬度测试仪,研究了不同热轧变形量(40%、60%、80%、90%)和变形温度(440、450、460、470℃)对Al-Zn-Mg-Cu合金组织和性能的影响。结果表明:在轧制温度440℃时,随着轧制变形量的增大,合金的再结晶程度逐渐提高,晶粒沿轧制方向明显被拉长。当变形量为80%时,随着轧制温度的升高,再结晶程度逐渐下降,强度呈先降后升的趋势,而伸长率呈先升高后下降趋势。该合金最佳的轧制工艺为轧制温度440℃,变形量80%。此工艺下的抗拉强度为418 MPa,屈服强度为238 MPa,伸长率为19%。

The effects of different hot rolling deformation(40%,60%,80%,90%)and deformation temperature(440,450,460,470℃)on the microstructure and properties of Al-Zn-Mg-Cu alloy were studied by means of metallographic microscope,tensile tester and hardness tester.The results show that the recrystallization degree of the alloy increases gradually with the increase of rolling deformation at rolling temperture of 440℃,and the grain is obviously elongated along the rolling direction.When the deformation is 80%,with the increase of rolling temperature,the recrystallization degree decreases,the strength decreases firstly and then increases,while the elongation increases firstly then decreases.The optimum rolling process of the alloy is rolling temperature of 440℃,deformation of 80%.The tensile strength of the alloy formed by this process is418 MPa,the yield strength is 238 MPa,and the elongation is 19%.