• CN:11-2187/TH
  • ISSN:0577-6686

›› 2000, Vol. 36 ›› Issue (4): 106-108.

• 论文 • 上一篇    下一篇

激光重熔处理对铸态Zn-27%Al合金的组织和性能的影响

丁志敏;张利明;陈美玲   

  1. 大连铁道学院材料科学与工程系
  • 发布日期:2000-04-15

MICROSTURCTURE AND PROPERTIES OF AS-CAST Zn-27% Al ALLOY AFTER LASER REMELTED PROCESSING

Ding Zhimin;Zhang Liming;Chen Meiling   

  1. Dalian Railway Institute
  • Published:2000-04-15

摘要: 经激光表面重熔处理后高铝锌基铸态Zn-27%Al合金的表层组织结构和性能均发生了较大的变化。表层组织根据其组织形态特征可分为非树枝状晶区、树枝状晶区和半熔化区三层。与激光处理前的相比,在X射线衍射谱上η-Zn相衍射强度降低,α-Al相衍射峰出现边带效应。表层硬度和耐磨性由于组织细化而分别提高了约15%和26%。若提高激光加热功率,硬化层深度随之增加。

关键词: Zn-27%Al合金, 激光重熔处理

Abstract: Microstructure and properties of the surface layer of a laser – remelted – treated as – cast Zn – 27% Al alloy are changed. The layer can be divided into non-dendrite, dendritel and partly – melted zones according to the features of the microstructure. Diffraction intensity ofη-Zn phase decreased and fringe effect appeared in the diffraction peakes ofα-Al phase on X – ray spectrometer after the alloy is treated, and hardness of the layer surface and wear resistance are increased respectly by 15% and 26% because of a very fine microstructure of the layer comparing with ones of the original alloy. The depth of the hardened layer increases with the increment of laser heating power.

Key words: Laser remelted processing, Zn – 27% Al alloy

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