摘要
用压入蠕变的方法研究了AE42合金和在AE41合金中加入0.4%～1.2%Ca的(质量分数,下同)Mg-Al-RE-Ca合金的抗蠕变性能,并利用光学显微镜,XRD和SEM(带EDS)对合金蠕变前后的组织结构进行了分析。结果表明:随着Ca添加量的提高,Mg-Al-RE-Ca合金的压入抗蠕变性能也不断提高,Mg-Al-RE-Ca合金在150℃和175℃时的压入抗蠕变性能优于AE42合金。压入蠕变前后的组织结构分析表明:AE42合金中Al11Nd3相在高温下不稳定会分解,造成抗蠕变性能下降;而在稀土含量相对少的Mg-Al-RE-Ca合金中,形成热稳定性好的Al2Ca,改善了合金的抗蠕变性能。
The indentation creep behavior of AE42 and Mg-Al-RE-Ca alloys composed of AE41 and 0.4 wt%-1.2 wt% Ca have been studied. The microstructure changes before and after creep were analyzed by optical microscope, XRD and SEM equipped with EDS. The results indicate that creep resistances of Mg-Al-RE-Ca alloys are improved with addition of Ca. The indentation creep resistances of Mg-Al-RE-Ca alloys are better than that of AE42 at 150℃ and 175℃. The microstructure shows that Al13Nd3 phase in AE42 is prone to decompose at high temperature, which deteriorates creep resistances. Mg-Al-RE-Ca alloys have good indentation creep resistances because of the formation of heat-resistant phase Al2Ca in the alloys.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第12期1864-1868,共5页
Rare Metal Materials and Engineering
基金
四川省科技厅重点科技攻关项目(03GG009-007-4)
关键词
镁合金
AE42
AE41
钙
稀土
压入蠕变
组织结构
magnesium alloy
AE42
AE41
calcium
rare earth
indentation creep
microstructure
