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对铸态Mg-6Li-3Al-1Zn(LAZ631)合金进行了热轧,采用金相观察、X射线衍射分析以及拉伸测试等手段,研究了不同工艺下热轧板的显微组织和拉伸性能。结果表明,LAZ631镁锂合金可进行大变形量的热轧,随着轧制变形量的增加,合金组织得到细化。在较高的轧制温度时,合金中部分Al Li相发生固溶,α相产生(0002)面的择优取向。在大变形量的合金中,β相呈现连续的细线型分布在基体α相中。由于加工硬化和组织细化,合金的抗拉强度随轧制温度升高和变形量的增加而提高,抗拉强度最高达到312.73 MPa。由于温度引发的再结晶程度不同,当轧制温度较高时,伸长率随变形量增加而下降,在较低温度轧制时,伸长率随变形量增加先升高后降低。
The as-cast Mg-6Li-3Al-1Zn (LAZ631) alloy was hot-rolled. The microstructure and tensile properties of the hot-rolled plate were studied by means of metallographic observation, X-ray diffraction analysis and tensile test. performance. The results show that LAZ631 magnesium-lithium alloy can be hot-rolled with a large amount of deformation. With the increase of rolling deformation, the alloy structure is refined. At higher rolling temperatures, part of the Al Li phase solidifies and the α phase produces a preferred orientation of the (0002) plane. In large deformation of the alloy, β-phase showed continuous thin-line distribution in the matrix α-phase. Due to work hardening and microstructure refinement, the tensile strength of the alloy increases with the increase of the rolling temperature and the deformation, and the tensile strength reaches up to 312.73 MPa. Due to the different degree of recrystallization caused by temperature, when the rolling temperature is higher, the elongation decreases with the increase of deformation. At the lower temperature, the elongation increases first and then decreases with the increase of deformation.