摘要
采用XJG 04型金相显微镜、JCXA 733电子探针、D/max rB型X射线衍射仪及WDW 200型电子万能实验机研究了Y对Mg 0 8Zr 0 35Zn基合金铸态、固溶时效组织及高温(250℃)性能的影响。结果表明:Y能细化Mg 0 8Zr 0 35Zn基合金铸态及热处理态组织,加入Y形成新相Mg24Y5。在250℃时,随着Y含量增加合金高温抗拉强度增大,延伸率及断面收缩率降低;高温拉伸断口SEM图像显示脆性断裂趋势增大,断裂由延性向解理方式发展。
The effects of Y addition on microstructures and elevated temperature (250 ℃) properties of as-cast and solid solution and ageing treatment Mg-0.8Zr-0.35Zn base alloys were investigated by using XJG-04 optical microscopy, JCXA-733 electron probe, D/max-rB X-ray diffractometer and WDW-200 electronic universal material testing machine. The results show that the microstructures of as-cast and heat treated Mg-0.8Zr-0.35Zn base alloys with addition of Y are refined and a kind of new phase, Mg_(24)Y_5, is formed. At 250 ℃, the elevated temperature strength of the alloys is increased with the increasing amount of Y addition, but elongation and section reduction are decreased. The tendency of brittle fracture of elevated temperature fracture section is enlarged and alloys are transferred from ductile fracture to cleavage fracture.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2004年第1期134-137,共4页
Journal of the Chinese Society of Rare Earths
基金
哈尔滨市青年基金项目(2002AFQXJ031)
黑龙江省教育厅科研项目(10531050)
关键词
金属材料
显微组织
高温性能
稀土金属
稀土
metal materials
microstructures
elevated temperature properties
rare earth metal
rare earths
