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为了提高Mg-8Li-3Gd-3Y-0.6Al合金铸锭的力学性能,对合金进行了均匀化退火处理。通过金相显微镜、扫描电镜、显微硬度测试、X射线衍射、拉伸力学性能测试等手段,研究了均匀化条件对Mg-8Li-3Gd-3Y-0.6Al合金的显微组织和力学性能的影响。结果表明,铸态合金经773K 8h的均匀化处理后,铸态时的网状相完全溶解到基体中,第二相弥散分布在基体中,同时退火态合金的抗拉强度达到了154 MPa,比铸态合金提高了23%。合金最佳的均匀化退火工艺是773K 8h,此时该合金具有较好的综合力学性能。
In order to improve the mechanical properties of Mg-8Li-3Gd-3Y-0.6Al alloy ingot, the alloy was homogenized and annealed. The microstructure and mechanical properties of Mg-8Li-3Gd-3Y-0.6Al alloy were investigated by means of metallographic microscope, scanning electron microscopy, microhardness test, X-ray diffraction and tensile mechanical properties test influences. The results show that the as-cast alloy is homogenized at 773K for 8h, the network phase is completely dissolved into the matrix and the second phase is dispersed in the matrix. At the same time, the tensile strength of the as-annealed alloy reaches 154 MPa, 23% more than as-cast alloy. The best alloy homogenization annealing process is 773K 8h, when the alloy has good mechanical properties.