摘要
研究了cCe≥45%(wt)的混合稀土对ZA-27合金显微组织及高温机械性能的影响。结果表明,在锌铝合金中,稀土元素可与Al、Zn、Cu等形成多种复杂成分化合物,其硬度高,热硬性好,分散于晶界或枝晶间,细化了组织,且有效地阻碍了高温时基体的变形和晶界移动。添加适量的稀土,可使ZA-27合金在150℃时的抗拉强度提高30%,硬度提高25%,延伸率虽有所下降,但冲击韧性却得以改善。同时发现,室温强度变化不大,唯塑性、韧性略有下降。
The effect of mixedRE of cCe≥45%(wt) on the high temperature mechanical properties and morphology of ZA-27 alloys has been investigated. The results show that rare earth elements can react with elements Al, Zn, Cu etc. to form some compounds of complex constituents which have high hardness and good hothardness and can disperse in crystalinterfaces or branch crystal interfaces so that the alloy has been refined and the deformation of matrix and movement of crystalinterfaces at high temperature are tempered. Addition of RE in appropriate contents can result in increase of tensile strength to about 30% and hardness to 25% at 150 ℃. Elongation is somewhat decreased, but impact toughness is improved. The observation shows that the strength at room temperature changes a little although the plasticity and impulsive tenacity decrease slightly.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1998年第1期41-44,共4页
Journal of the Chinese Society of Rare Earths
关键词
稀土
锌铝合金
高温性能
ZA-27
Rare earths, Zn-Al alloy, High temperature mechanical properties