摘要
研究了不同添加量的富镧混合稀土对Mg-10Li-4Al合金显微组织的影响,分析了稀土化合物在合金中的作用,测量了铸态合金室温力学性能。研究表明,富镧混合稀土加入后,细化了晶粒,合金中生成短棒状稀土化合物Al3La,抑制了合金中MgLiAl2相和Mg17Al12相的生成,提高了合金的力学性能;当Al3La数量增多时,合金强度缓慢提高,延伸率下降。
The influence of varied contents misch metal on microstructure of the Mg-10Li-4Al alloys was studied, and the effect of RE- compound in alloys was analyzed as well. In addition, the mechanical properties of alloys at room temperature were measured. The results indicate that the additions of lanthanum misch metal refine the grain and lead to the formation of rod-shaped Al3 La compound which restrains the formation of Mg17Al12 and MgLiAl2phases, consequently, the mechanical properties were improved. With the increasing amount of Al3 La compound in alloy and it size become to coarsening, the strength of the alloys improved slowly and the elongation decreased.
出处
《航空材料学报》
EI
CAS
CSCD
2007年第5期17-21,共5页
Journal of Aeronautical Materials
关键词
镁锂合金
显微组织
稀土化合物
力学性能
Mg-Li alloys
metallographic microstructure
RE compound
mechanical properties
