(1. 同济大学 材料学院， 上海 200092;
2. 上海市金属功能材料重点实验室， 上海 200940；
3. 中南大学 材料科学与工程系， 长沙 410083)
摘 要: 以Zn-35%Al合金为研究对象，研究了陶瓷相对锌铝基合金激光重熔区表面硬度的影响。结果表明：含Al2O3陶瓷表层经激光处理后的显微硬度高于表层不含Al2O3陶瓷直接激光处理的试样，并在过渡区出现了第二个硬度峰值。采用AES，TEM分析发现，δ Al2O3相的存在是造成这一结果的主要原因。
关键词: 激光重熔； 金属基陶瓷复合； 锌铝基合金
remelting area of Zn-Al based alloy
（1. School of Materials Science and Engineering ，
Tongji University， Shanghai 200092, P.R.China;
2. Shanghai Key Lab. for Research & Developing & Applications of
Metallic Functional Materials， Shanghai 200940, P.R.China;
3. Department of Materials Science & Engineering，
Central South University, Changsha 410083, P.R.China）
Abstract:The effect of Al2O3 phase on the microhardness of laser re-melting area of Zn-Al based alloy was studied. The results show that the microhardness of sample contained Al2O3 phase after laser re-melting has higher value than that of treated directly with laser beam. The reason for the occurrence of second hardness peak is the delta aluminum oxide(tetragonal) existing on the transitional area.
Key words: laser remelting; metal matrix composites(MMC); Zn-Al based alloys
