Mg-8.5Li-3Al-xCe系合金的时效行为研究

Aging Behavior of Mg-8.5Li-3Al-xCe Alloy

摘要:

采用真空感应熔炼技术制备Mg-8.5Li-3Al-xCe(x=0, 1, 3)合金。研究Mg-8.5Li-3Al-xCe系合金的时效行为。结果表明，Ce对时效硬化程度具有显著的影响，随Ce含量的增加合金在各时期的硬度都增大，最高时效峰硬度也随之提高，过时效软化的程度随之降低。Ce抑制时效硬化相MgLi2Al和时效软化相AlLi相的生成是Mg-8.5Li-3Al-xCe系合金时效硬化及过时效软化程度降低的主要原因，Ce是抑制Mg-Li-Al合金发生时效软化的有益元素

Abstract:

Mg-8.5Li-3Al-xCe (x=0, 1, 3) alloys were prepared with vacuum induction melting method. Then the aging behavior of the Mg-8.5Li-3Al-xCe alloy was investigated. The results show that Ce has an obvious effect on the aging-hardening process. With the increase of Ce content, the aging hardness increases and the over-aging softening is suppressed to some extent. The aging hardness increase and the over-aging softening decrease of Mg-8.5Li-3Al-xCe (x=0, 1, 3) alloys is mainly attributed to that Ce inhibits the generation of age-hardening phase MgLi2A1 and over-aging softening phase AlLi. Ce can hinder the over-aging process in Mg-Li-Al alloys