Mg-Gd-Y-Zr镁合金时效硬化研究

On the Law of Age-hardening of Mg-Gd-Y-Zr Magnesium Alloy

通过对Mg-Gd-Y-Zr合金进行充分固溶,并在不同温度下进行时效实验,研究了该合金在时效过程中的微观组织及硬度的变化。结果表明:充分固溶处理后,Gd、Y元素在合金晶界处的偏析基本消除;200℃时效时,合金硬度随时效时间的延长而提高,出现小峰值,随后继续增长,达到峰值后,硬度缓慢下降,逐渐趋于平稳;时效温度越高,合金时效动力越大,达到峰值硬度所需的时间越短,峰值硬度越小。

Through the full solution and aging at different temperatures, the microstructure and hardness of Mg- Gd-Y-Zr alloy in the process of aging are studied. The results showed the segregation of the Gd and Y in the grain boundary can be eliminated almost completely by full solution treatment; aged at 200 ℃, the value of hardness increases rapidly at the beginning, and then emerges a little peak, after that the value rises slowly; the hardness begins to fall down slowly when reaches its peak hardness; The higher the aging temperature, the smaller the peak hardness, and the shorter the time of reaching the peak hardness.