热处理对Mg-Gd-Y-Zr合金组织和力学性能的影响

Influence of Heat Treatment on Mechanical Properties and Microstructure of Mg-Gd-Y-Zr Alloy

采用拉伸、硬度、显微组织观察等方法,研究了不同热处理条件对Mg-Gd-Y-Zr合金组织和力学性能的影响。结果表明,铸态Mg-Gd-Y-Zr合金经固溶处理后其塑性提高,δ5提高40%;挤压可以明显改善合金的强度和塑性,相比铸态,σb提高25%,σ0.2提高30%,δ5达到14.9%;时效可使挤压态合金的强度得到进一步提高,峰时效时,σb达到420MPa,σ0.2达到310MPa,但塑性有所降低,δ5降低至7.5%。

The effects of different heat-treatment conditions on the microstructure and mechanical properties of Mg-Gd-Y-Zr alloy were investigated by tensile test and hardness measurement. The results show the solution treatment can increase 85 about 40%; the extrusion can improve the mechanical properties,compared with the alloy as-cast, the σb,σ0.2 increases 25%,30%,respectively; and the 85 can achieve 14.9% ;the aging after extrusion can obviously improve the strength, the σb, σ0.2 achieves 420MPa, 310MPa,respectively, but 85 is decreased to 7.5%.