铸态Mg-Li-Al-xSi合金微观组织和力学性能（英文）

发布时间：2018-01-16 04:31

本文关键词：铸态Mg-Li-Al-xSi合金微观组织和力学性能（英文）　出处：《稀有金属材料与工程》2017年08期 　论文类型：期刊论文

更多相关文章： 镁合金 显微组织 力学性能 硅元素

【摘要】：实验铸造了Mg-9Li-3Al-x Si(x=0,0.1,0.5,1.0,质量分数,%)合金并通过OM,SEM,XRD和力学性能测试对其进行了研究。结果表明:铸态Mg-9Li-3Al合金组织中主要由α-Mg、β-Li、Mg_(17)Al_(12)相组成。加入Si后,合金中出现了新相Mg2Si,晶粒得到了明显细化,且Si能够抑制Mg_(17)Al_(12)的形成;当合金中的Si含量过高时,α-Mg相粗化,且会在相界处出现块状和汉字状的Mg_2Si相。合金的强度随着Si含量的增加呈现先增加后降低的趋势,合金的延伸率随着Si含量的增加呈现逐渐降低的趋势。当合金中Si含量为0.1%时,抗拉强度达到最大值182.5 MPa,延伸率为12.1%。
[Abstract]:The alloy of Mg-9Li-3Al-x SixCX 0. 1 + 0. 5 + 1. 0. 0. 0. 0. 0. 1. 0. 0. 0. 5. 0. 0. 0. 0. 0. 0. 5. The results of XRD and mechanical properties test show that 伪 -Mg, 尾 -Li is the main component in the as-cast Mg-9Li-3Al alloy. After adding Si, a new phase mg _ 2Si appears in the alloy, and the grain size is obviously refined. And Si can inhibit the formation of MgS17 / AlS-1); When the Si content in the alloy is too high, 伪 -Mg phase coarser, and there will be block and Chinese character Mg_2Si phase at the phase boundary. The strength of the alloy increases first and then decreases with the increase of Si content. The elongation of the alloy decreases gradually with the increase of Si content. When the Si content in the alloy is 0.1, the tensile strength reaches the maximum of 182.5 MPa and the elongation is 12.1MPa.
【作者单位】：重庆大学;国家镁合金材料工程技术研究中心;
【基金】：Fundamental Research Funds for the Central Universities of China(106112015CDJXY130011,CDJZR14130007)
【分类号】：TG146.22;TG292
【正文快照】： The demand for lightweight structural materials is fueledtensive application of Mg-Li alloys is restricted.by the strategic requirement of reducing the greenhouse gasAccording to Mg-Li binary phase diagram,α-Mg withemissions and energy consumption[1,2].

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