研究了Mg-9.8Gd-1.6Y-0.02Zn-0.5Zr(GW102)镁合金挤压棒材的显微组织和不同方向的拉伸性能.结果表明,经520℃均匀化处理的GW102镁合金的组织主要由过饱和镁固溶体、少量凝固期间析出的颗粒相Mg5(Y06Gd04)和非平衡相Mg3(Gd05,Y05)组成.挤压变形并在200℃时效热处理60h后,从过饱和固溶体中弥散析出大量针片状β"相和β"相.该镁合金经过挤压变形后具有明显的各向异性,垂直挤压方向合金的抗拉强度显著低于挤压方向的抗拉强度和延伸率.GW102合金的强化,其主要原因是长周期结构相(LPSO)与位错的相互作用和晶界上无沉淀析出带的影响.
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