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研究了250℃时不同拉伸速率对高强耐热镁稀土合金Mg-12Gd-2Y-Sm-0.5Zr强度的影响,对时效态合金的显微组织进行了观察分析。结果发现:在研究范围内,拉伸速率对合金力学性能有一定影响,在250℃条件下,随着随拉伸速率从0.5 mm/min升高到4 mm/min,屈服强度有所提高,合金抗拉强度先升高后降低,拉伸速率为2 mm/min时抗拉强度达到最大值314.6 MPa。研究认为,拉伸速率通过改变合金的形变强化及裂纹扩展行为对合金的力学性能产生影响。
The effect of different tensile rates on the strength of Mg-12Gd-2Y-Sm-0.5Zr alloy was investigated at 250 ℃. The microstructure of aged alloy was observed and analyzed. The results show that the tensile rate has some influence on the mechanical properties of the alloy within the scope of the study. At 250 ℃, as the tensile rate increases from 0.5 mm / min to 4 mm / min, the yield strength increases, The tensile strength of the alloy first increased and then decreased, and the tensile strength reached 314.6 MPa at the tensile rate of 2 mm / min. It is considered that the tensile rate affects the mechanical properties of the alloy by changing the deformation strengthening and the crack propagation behavior of the alloy.