摘要
通过向AZ91D合金中添加Ca、Ba、Sr3种碱土元素,熔炼制备了铸态镁合金,利用OM、SEM、EDS和XRD等手段研究了合金的铸态组织和物相组成,测试了其力学性能。结果表明,Ca、Ba、Sr的综合作用可以显著细化镁合金的铸态组织,并使网络状β-Mg17Al12相以球块状弥散分布,室温抗拉强度从AZ91D合金的156.3MPa提高到AZ91D-0.5Ca-0.2Ba-0.1Sr合金的187.6MPa。
The as-cast magnesium alloy was prepared with alkaline earth element,such as Ca,Ba and Sr,by melting-casting.Microstructure,phase constituent and mechanical properties of the alloy were investigated by OM(optical microscope),SEM(scanning electron microscope),EDS(energy dispersive spectrometer)and XRD(X-ray diffraction)as well as tensile testing.The results show that the as-cast microstructure of the alloy can be significantly refined as a result of comprehensive effects of Ca,Ba and Sr element,in which net-like β-Mg17Al12 phase is converted into globular structure with dispersive distribution.In addition,the ambient tensile strength is increased form 156.3MPa of AZ91D alloy to 184.6MPa of AZ91D-0.5Ca-0.2Ba-0.1Sr alloy.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2009年第6期564-566,共3页
Special Casting & Nonferrous Alloys
基金
江苏省高技术研究项目(BG2007030)
江苏省高校自然科学重大基础研究项目(07KJA43008)
