摘要
采用双辊快速凝固技术制备了Mg-6Zn-xCa合金薄带,通过金相显微镜、扫描电镜、X射线衍射仪、差示扫描量热分析仪及显微硬度计研究了薄带的组织与性能特征。结果表明,不仅快速凝固显著细化晶粒和第二相,Ca也有助于合金微观组织的进一步细化;快速凝固Mg-6Zn合金的组织由过饱和固溶体a-Mg、Mg51Zn20,以及少量的Mg2Zn3和MgZn2组成。随着Ca的加入,Mg2Ca、Ca2Mg6Zn3和MgZn2相逐渐增多,而Mg2Zn3和Mg51Zn20却有所减少,因此,Ca的添加有助于提高快速凝固Mg-6Zn合金的热稳定性。
Microstructure and properties of Mg-6Zn ribbons with different Ca addition prepared by two-roll rapid solidification were investigated by OM,SEM,XRD and DSC as well as micro-hardness tester. The results indicate that besides rapid solidification can greatly refine primary phase and secondary phase,Ca can give a help for refining further microstructure of the alloy too. The microstructure of the rapidly solidified Mg-6Zn alloy ribbons are composed of supersaturated α-Mg,Mg51Zn20 phase and a little Mg2Zn3 and MgZn2 phase. With increasing in Ca addition,Mg2Ca,Ca2Mg6Zn3 and MgZn2 phase are gradually increased with the decrease of Mg2Zn3 and Mg51Zn20 phase,which is beneficial to improving the thermal stability of the alloy.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第8期772-775,共4页
Special Casting & Nonferrous Alloys
