Li Bin, Chen Hao, Ke Xiangnan, Wei Guobing, Yang Qingshan
International Joint Laboratory for Light Alloys (MOE), Chongqing University, Chongqing 400044, China.
National Key Laboratory of Advanced Casting Technologies, Chongqing University, Chongqing 400044, China.
Materials (Basel). 2023 Jun 20;16(12):4489. doi: 10.3390/ma16124489.
To meet the demand for more extensive applications of Mg alloys, a Mg-5Al-2Ca-1Mn-0.5Zn alloy without RE was prepared in this paper, and its mechanical properties were further improved by conventional hot extrusion and subsequent rotary swaging. The results show that the hardness of the alloy decreases along the radial central region after rotary swaging. The strength and hardness of the central area are lower, but the ductility is higher. The yield strength and ultimate tensile strength of the alloy in the peripheral area after rotary swaging reach 352 MPa and 386 MPa, respectively, while the elongation remains at 9.6%, exhibiting better strength-ductility synergy. The grain refinement and dislocation increase caused by rotary swaging promoted strength improvement. The activation of non-basal slips during rotary swaging is an important reason for the alloy to maintain good plasticity while improving strength.
为满足镁合金更广泛应用的需求，本文制备了一种不含稀土的Mg-5Al-2Ca-1Mn-0.5Zn合金，并通过常规热挤压及后续旋转锻造进一步提高其力学性能。结果表明，旋转锻造后合金硬度沿径向中心区域降低。中心区域的强度和硬度较低，但延展性较高。旋转锻造后合金外周区域的屈服强度和抗拉强度分别达到352MPa和386MPa，而伸长率保持在9.6%，表现出较好的强韧性协同效应。旋转锻造引起的晶粒细化和位错增加促进了强度提高。旋转锻造过程中非基面滑移的激活是合金在提高强度的同时保持良好塑性的重要原因。
