摘要
采用微合金化方法研究了微量稀土元素镧对锌铝合金显微组织和力学性能的影响。研究结果表明,稀土与合金熔液中的锌和铝反应生成的细小稀土化合物可作为α-Al相的有效异质形核核心,适量的稀土元素镧能阻碍初生η-Zn相枝晶的生长,细化锌铝合金的显微组织;适量的稀土元素使锌铝合金的抗拉强度和伸长率明显提高,稀土镧元素的最佳加入量为0.05%,此时锌铝合金具有较好的综合力学性能。
The microalloying method was employed to study the effect of rare-earth lanthanum on the microstructure and mechanical properties of zinc-aluminum alloy. The results show that La reacts with Zn and Al in liquid alloy, and generates fine rare-earth compounds. Most of these compounds could be the effective heterogeneous nucleation of α-Al phase. The growth of the primary dendritic η-Zn phase could be impeded by adding adequate amount of La, which makes the microstructure of zinc-aluminum alloy become finer. The adequate amount of La in zinc-aluminum alloy could increase obviously the tensile strength and elongation of the alloy. When the content of La is 0.05%, the zinc-aluminum alloy possesses better comprehensive mechanical properties.
出处
《铸造》
CAS
CSCD
北大核心
2011年第2期171-174,共4页
Foundry
基金
国家自然科学基金项目资助(51074030,50971111)
湖南省科技厅一般项目资助(2009FJ3143)
关键词
锌铝合金
微合金化
稀土
显微组织
力学性能
zinc-aluminum alloy
microalloying
rare-earth
microstructure
mechanical properties
