摘要
通过组织观察和力学性能测试等方法,对挤压态Mg-Gd-Y-Nd-Zr合金的时效行为进行了研究,分析了T5和T6时效处理对合金组织及性能的影响。结果表明,时效温度为225℃的挤压态合金达到T5峰时效的时间最短,为24 h,且随时效温度的升高,挤压态合金达到T5峰时效的时间缩短,T5峰时效态的硬度值减小;进行T6时效处理时也具有明显的时效硬化效果,但合金达到T6峰时效的时间延长;相比于挤压态合金,经过T6峰时效处理后,合金强度明显提高,但与经过T5峰时效处理的合金相比,其强度和伸长率均明显降低,说明挤压态合金进行T5时效处理的效果要好于T6时效处理。
The as-extruded Mg-Gd-Y-Nd-Zr alloy was subjected to T5 and T6 aging treatment. And the microstructure observation and mechanical properties testing were conducted to investigate the aging behavior of Mg-Gd-Y-Nd-Zr alloy. The results show that the extruded alloy with the T5 aging temperature of 225 ℃ takes the shortest time of 24 h to reach the peak hardness. With the increase of aging temperature, it takes shorter time to reach the peak hardness, while the peak hardness decreases. In addition, the hardness of the extruded alloy is also improved greatly after T6 aging treatment. And it takes more time to reach the peak hardness. Comparing with the as-extruded alloy, the strength of the T6 peak-aged alloy highly increases. But the tensile properties of the T6 peak-aged alloy are lower than that of T5 peak-aged alloy, indicating that the T5 is a suitable aging treatment process for extruded Mg-Gd-Y-Nd-Zr alloy.
出处
《热加工工艺》
CSCD
北大核心
2014年第10期194-196,200,共4页
Hot Working Technology
