摘要
利用OM、XRD、DSC和SEM等方法研究了Zn含量对铸态Mg-(8-14)Zn-3Al镁合金显微组织与凝固行为的影响。结果表明:Mg-(8-14)Zn-3Al合金的铸态组织由α-Mg相、颗粒状或骨骼状的ε-Mg Zn相以及狭长块状的τ-Mg_(32)(Al,Zn)_(49)相组成。随着Zn含量的增加,合金中ε-Mg Zn相和τ-Mg_(32)(Al,Zn)_(49)相增多,沿晶界呈连续网状分布,且合金的平均晶粒尺寸呈减小趋势。与此同时,Zn含量的增加使得Mg-(8-14)Zn-3Al合金中α-Mg相和第二相析出温度降低、合金的凝固温度区间减小。Mg-(8-14)Zn-3Al合金凝固路径相同。Zn含量的增加使得合金中显微疏松由分散状态转变为条形的聚集状态。
The effect of Zn content on the microstructure and solidification behavior of as-cast Mg-(8-14)Zn-3 Al magnesium alloys was investigated by OM, XRD, DSC and SEM. The results show that the microstructure of as-cast Mg-(8-14)Zn-3 Al alloys consists of α-Mg phase, granular or skeletal ε-Mg Zn phase and long block τ-Mg_(32)(Al,Zn)_(49) phase. With the increase of Zn content, the ε-Mg Zn phase and τ-Mg_(32)(Al,Zn)_(49) phase in the alloy increase, and they are distributed along the grain boundary with continuously reticular, and the average grain size of the alloy decreases. Meanwhile, the increase of Zn content makes the precipitation temperature of α-Mg phase and second phase in Mg-(8-14)Zn-3 Al alloys decrease, and the solidification temperature range of the alloy decreases. Mg-(8-14)Zn-3 Al alloys’ solidification path is the same. Increasing the Zn content makes the micro-porosity in the alloy change from the dispersed state to the strip aggregation state.
作者
王杰
周吉学
唐守秋
WANG Jie;ZHOU Jixue;TANG Shouqiu(Shandong Key Laboratory for High Strength Lightweight Metallic Materials,Institute of New Materials at Qilu University of Technology(Shandong Academy of Sciences),Ji'nan 250014,China;School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China)
出处
《热加工工艺》
北大核心
2021年第9期35-39,44,共6页
Hot Working Technology
