超轻Mg-Li-Al系变形镁合金挤压板材的组织及性能
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-01-29
通过OM、SEM、XRD和拉伸实验研究3种典型的Mg-Li-Al合金的铸态和挤压态组织及力学性能。
超轻Mg-Li-Al系变形镁合金挤压板材的组织及性能Microstructure and mechanical properties of as-extruded ultra-light Mg-Li-Al sheet通过OM、SEM、XRD和拉伸实验研究3种典型的Mg-Li-Al合金的铸态和挤压态组织及力学性能。结果表明：随着Li含量的增加，合金的结构从密排六方向体心立方转变，合金的铸态组织随之发生改变。经过250 ℃挤压处理后，Mg-5Li-1Al和Mg-9Li-1Al合金的晶粒沿挤压方向呈方向性排列，Mg-14Li-1Al合金由均匀的等轴晶(再结晶晶粒)组成。随着Li含量的增加，挤压态合金板材的屈服强度逐渐增大，其中挤压态Mg-9Li-1Al合金板材的综合力学性能最佳(屈服强度达到149 MPa，伸长率达到25%)。
The as-cast and extruded microstructures and mechanical properties of three kinds of Mg-Li-Al alloys were studied by optical microscopy, SEM, XRD and tensile test. The results show that, with the increase of lithium additions, the crystal structure transforms from close-packed hexagonal (HCP) structure to body centered cubic (BCC) structure, and the as-cast microstructures of the Mg-Li-Al alloys change correspondingly. After extrusion at 250℃, the grain of Mg-5Li-1Al and Mg-9Li-1Al alloys are arranged along the extruded direction, but the microstructures of Mg-14Li-1Al alloy sheet consist of equiaxed crystals. The yield stress of the extruded alloys is improved gradually with the increase of lithium content. The extruded Mg-9Li-1Al alloy obtains the optimal mechanical properties (the yield stress and elongation are 149 MPa and 25%, respectively), along the transverse direction.
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