摘要
试验研究了Sb对Mg-8Zn-4Al-0·3Mn铸造镁合金显微组织的影响。结果表明,含Sb铸造镁合金Mg-8Zn-4Al-0·3Mn-xSb的显微组织由基体α(Mg)、共晶[α(Mg)+τ]、三元相τ(Mg32(Al,Zn)49、二元相MgZn2和Mg3Sb2组成;随着Sb含量的增加,合金晶界上三元相的形态逐渐由半连续网状变为分散均匀的颗粒状;w(Sb)=0.3%为最佳加入量,此时的合金铸态组织被明显细化,晶粒大小由120μm^130μm减小到50μm^60μm。同时,合金的显微硬度值也随Sb含量的增加而增加。
The effects of the modifier Sb on the mierostruetures of the east magnesium alloy Mg-8Zn-4Al-0.3Mn have been studied. The results show that the cast microstructures of the alloy containing Sb consist of the matrix a（Mg）, the eutectic mixture [ a（Mg） ＋ r], the ternary phases r（ Mg32 （Al, Zn）49 ）, and the dual phases MgZn2 and Mg3 Sb2. The morphologies of the ternary phase on the grain boundaries have been changed from quasi-continuous-net shape to uniformly dispersed particles by the addition of modifier Sb. And it is also found that the optimal addition of w（Sb） is0.3%, then the cast microstructures of the magnesium alloy can obviously be refined, the size of grains decreasing from 120μm-130μmto 50 μm-60 μm. Meanwhile, the microhardness of the matrix of the magnesium alloy is found to increase with the increases of Sb contents.
出处
《轻合金加工技术》
CAS
北大核心
2006年第6期39-42,共4页
Light Alloy Fabrication Technology
