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制备了Mg-6Al-1.0Ca-0.5Mn-x Sm(x=0.5,1.5,4.5,质量分数,%)合金,研究了合金的显微组织和力学性能。实验结果表明,随着Sm质量分数的增加,Al_2Sm相主要在晶内析出且体积分数增加,相反Mg_(17)Al_(12)相的体积分数降低;挤压后合金发生动态再结晶,晶粒细化。在室温条件下,含1.5%Sm合金显示了最佳的力学性能,其极限抗拉强度、屈服强度和伸长率分别为316 MPa,148 MPa和21.3%。该合金优异的力学性能主要是由于晶粒细化、Al_2Sm颗粒的弥散强化和减少Mg_(17)Al_(12)相的析出。
The microstructure and mechanical properties of Mg-6Al-1.0Ca-0.5Mn-x Sm (x = 0.5,1.5,4.5, mass fraction,%) were investigated. The experimental results show that the Al 2 Sm phase mainly precipitates in the crystal and the volume fraction increases with the increase of the mass fraction of Sm, whereas the volume fraction of the Mg 17 Al 12 phase decreases. The dynamic recrystallization of the alloy occurs after the extrusion. Refine. The 1.5% Sm alloy showed the best mechanical properties at room temperature with ultimate tensile strength, yield strength and elongation of 316 MPa, 148 MPa and 21.3%, respectively. The excellent mechanical properties of the alloy are mainly due to grain refinement, dispersion strengthening of Al 2 Sm particles and reduction of precipitation of Mg 17 Al 12 phase.