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采用维氏硬度测试、拉伸性能测试等方法研究了不同拉伸预变形量对2219铝合金在177℃时效时的力学性能影响,并利用光学显微镜、扫描电镜和透射电镜观察了其微观形貌和显微组织。结果表明:合金经过预拉伸变形后晶粒伸长,时效后晶粒中析出大量的正交片状析出相,合金强度明显提高;增大预变形量可以促进过渡相θ″向θ’的转变析出,15%预拉伸样品在6 h即达到峰值时效,屈服强度和伸长率由时效前的322.9 MPa、14.0%变为368.8 MPa和9.6%;在同一时效时间,合金的强度随着预拉伸量的增加而提高,伸长率降低。
The mechanical properties of 2219 aluminum alloy under aging at 177 ℃ were studied by Vickers hardness test and tensile test. The microstructure of 2219 aluminum alloy was observed by optical microscope, scanning electron microscope and transmission electron microscope. And microstructure. The results show that the grain size of the alloy after pre-stretching deformation is large, and a large number of orthorhombic plate-shaped precipitates are precipitated in the grain after aging, and the strength of the alloy increases obviously. Increasing the amount of pre-deformation can promote the transformation of θ After 15 h of pre-stretching, the specimens reached peak aging at 6 h, yield strength and elongation changed from 322.9 MPa and 14.0% before aging to 368.8 MPa and 9.6%, respectively. With the same aging time, The amount of elongation increases, and the elongation decreases.