超輕Mg-Li-Al系變形鎂合金擠壓板材的組織及性能
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-01-29
通過OM、SEM、XRD和拉伸實(shí)驗(yàn)研究3種典型的Mg-Li-Al合金的鑄態(tài)和擠壓態(tài)組織及力學(xué)性能。
超輕Mg-Li-Al系變形鎂合金擠壓板材的組織及性能Microstructure and mechanical properties of as-extruded ultra-light Mg-Li-Al sheet通過OM、SEM、XRD和拉伸實(shí)驗(yàn)研究3種典型的Mg-Li-Al合金的鑄態(tài)和擠壓態(tài)組織及力學(xué)性能。結(jié)果表明：隨著Li含量的增加，合金的結(jié)構(gòu)從密排六方向體心立方轉(zhuǎn)變，合金的鑄態(tài)組織隨之發(fā)生改變。經(jīng)過250 ℃擠壓處理后，Mg-5Li-1Al和Mg-9Li-1Al合金的晶粒沿?cái)D壓方向呈方向性排列，Mg-14Li-1Al合金由均勻的等軸晶(再結(jié)晶晶粒)組成。隨著Li含量的增加，擠壓態(tài)合金板材的屈服強(qiáng)度逐漸增大，其中擠壓態(tài)Mg-9Li-1Al合金板材的綜合力學(xué)性能最佳(屈服強(qiáng)度達(dá)到149 MPa，伸長(zhǎng)率達(dá)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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