高能球磨制备高铝锌铝合金粉末的研究

Study on Aluminum Rich Zn-Al Alloy Powder Prepared by High Energy Ball Milling

首先采用一步球磨法制备了成分为Zn-30Al-6Si-0.5Cu(质量分数/%)和Zn-30Al-3Si-3Cu(质量分数/%)的高铝锌铝合金粉末,其次采用二步球磨法制备了成分为Zn-30Al-6Si-0.5Cu(质量分数/%)的合金粉末,并利用XRD、SEM粒度分析仪对粉末的物相组成、颗粒形貌及粒度进行了表征和分析。结果表明:含硅量为6%的合金粉末的颗粒尺寸比含硅量为3%的合金粉末更为细小,尺寸分布更为集中,球磨12h之后的粉末其金相组织主要由富Al的α相、富Zn的η相以及Si相组成。经过二步球磨后的Zn-30Al-6Si-0.5Cu粉末中Al9Si相基本消失,Si相含量增加;二步球磨法制备的粉末颗粒尺寸更为细小。通过扫描电镜观察发现粉末形貌不规则,且分布不够均匀,粉末中基本未观察到类似焊片的颗粒。

Two Zn-Al alloys powders with compositions being Zn-30Al-6Si-0.5Cu and Zn30Al-3Si-3Cu were first prepared by one step high energy ball milling process.Then the alloy powder（Zn-30Al-6Si-0.5Cu）was prepared by two step high energy ball milling process.The results show that the powder size of alloy prepared by the two step process is smaller and more uniform than that of Zn-30Al-3Si-3Cu;After milling for 12 hours,the alloy powder containing 6%Si contains Al rich α phase,Zn rich η phase and Si phase.After two step milling,Al9Si phase disappears while silicon phase increases.The powder size is smaller than that by one step milling.