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采用铁模铸造法制备了Mg-5Al-0.3Mn-2Ce镁合金。合金铸锭在410℃均匀化处理24h后,在400℃进行热轧试验。经过4道次轧制,合金的总压下量为62%。利用X-射线衍射仪、光学显微镜、扫描电子显微镜和拉伸试验研究了铸态合金和轧制态合金的组织和力学性能。结果表明,Mg-5Al-0.3Mn-2Ce合金由α-Mg和Al11Ce3相组成。轧制变形明显细化了合金的晶粒尺寸,轧制后合金的平均晶粒尺寸约为20μm。轧制后合金强度也得到了显著提高。轧制态合金的抗拉强度和屈服强度分别为301MPa和222MPa,与铸态合金相比,分别提高了69%和196%。
Mg-5Al-0.3Mn-2Ce magnesium alloy was prepared by iron die casting. The alloy ingots were homogenized at 410 ° C for 24 h and then hot-rolled at 400 ° C. After 4 pass rolling, the total reduction of the alloy was 62%. The microstructure and mechanical properties of as-cast and as-rolled alloys were investigated by X-ray diffraction, optical microscopy, scanning electron microscopy and tensile tests. The results show that the Mg-5Al-0.3Mn-2Ce alloy consists of α-Mg and Al11Ce3 phases. Rolling deformation significantly refined the alloy grain size, the average grain size of the alloy after rolling about 20μm. After rolling the alloy strength has also been significantly improved. Tensile strength and yield strength of the as-rolled alloy were 301 MPa and 222 MPa, respectively, which were respectively 69% and 196% higher than that of the as-cast alloy.