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采用金相(OM)、X射线衍射(XRD)、扫描电镜(SEM)、拉伸实验等方法研究了铸态和固溶态Mg-9Al-1Si合金在等通道转角挤压(ECAP)后的组织和力学性能。结果表明:铸态的Mg-9Al-1Si合金经过4道次ECAP变形后,网状Mg_(17)Al_(12)相和汉字状Mg2Si相破碎成颗粒状,但Mg_(17)Al_(12)颗粒的尺寸(~15μm)仍然很大,且Mg_(17)Al_(12)和Mg_2Si颗粒分布不均匀,削弱了合金力学性能。固溶态的Mg-9Al-1Si合金经过4道次ECAP变形后,析出细小的Mg_(17)Al_(12)颗粒(~1μm)和破碎的Mg_2Si颗粒呈均匀分布,晶粒明显细化,力学性能显著提高,抗拉强度、屈服强度和伸长率分别达到了280 MPa、178 MPa和6.8%。
The as-cast and solid solution Mg-9Al-1Si alloys were investigated by means of OM, XRD, SEM and tensile tests after ECAP Tissue and mechanical properties. The results show that after 4 passes of ECAP deformation, the reticular Mg 17 Al 12 phase and the Hanziform Mg 2 Si phase are broken into granules, The size of the particles (~ 15μm) is still large, and the distribution of Mg_ (17) Al_ (12) and Mg_2Si particles is not uniform, weakening the mechanical properties of the alloy. After 4 passes of ECAP deformation, the precipitated Mg 17 Al 12 particles (~ 1 μm) and the disintegrated Mg 2 Si particles are uniformly distributed and the grains are obviously refined. The mechanical The performance was significantly improved, and the tensile strength, yield strength and elongation reached 280 MPa, 178 MPa and 6.8% respectively.