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材料研究学报  2009, Vol. 23 Issue (6): 656-662    
  研究论文 本期目录 | 过刊浏览 |
AZ91D镁合金热处理与微弧氧化的交互作用
马颖 1;2; 张洪锋 1;  郝远 1;  陈体军 1;  李元东 1;  高唯 2;
1.兰州理工大学~有色金属新材料国家重点实验室培育基地 兰州 730050
2.奥克兰大学工学院 奥克兰 1142 新西兰
Interaction of heat-treatment and micro-arc oxidation on AZ91D magnesium alloys
MA Ying 1;2;  ZHANG Hongfeng 1;  HAO Yuan 1;  CHEN Tijun 1;  LI Yuandong 1;  CAO Wei 2
1.State Key Laboratory of Advanced Non-Ferrous Metal Materials; Lanzhou University of Technology; Lanzhou 730050
2.Faculty of Engineering; the University of Auckland; Auckland 1142; New Zealand
引用本文:

马颖 张洪锋 郝远 陈体军 李元东 高唯. AZ91D镁合金热处理与微弧氧化的交互作用[J]. 材料研究学报, 2009, 23(6): 656-662.
, . Interaction of heat-treatment and micro-arc oxidation on AZ91D magnesium alloys[J]. Chin J Mater Res, 2009, 23(6): 656-662.

全文: PDF(3258 KB)  
摘要: 

随着AZ91D镁合金微弧氧化反应的进行, 膜层逐渐增厚, 膜层表面的喷射孔洞和 喷射沉积物粗大化, 膜层表面粗糙度增大. 微弧氧化反应时膜层内部的应力集中会使膜层萌生微裂纹. 对基体进行固溶处理后可以改善其微弧氧化膜层中微裂纹的数量和形态以及膜层表面的粗糙度, 并能提高微弧氧化膜层的生长速率, 同时降低微弧氧化过程的能耗. 时效处理会使微弧氧化膜层中的残余应力得以释放, 微弧氧化膜的形貌没有发生明显改变, 即膜层表面的微裂纹在数量和形态上仍好于未经热处理基体膜层. 微弧氧化处理不会引起 基体组织的显著变化. 在硅酸盐溶液体系中,
AZ91D镁合金表面参与微弧氧化反应的Al比 Mg少得多, 同时还伴随着一个溶液中的Si向镁合金基体内部渗透的过程.

关键词 金属材料 镁合金 热处理 微弧氧化 膜层 微裂纹    
Abstract

With the micro-arc oxidation process of AZ91D magnesium alloys going, the thickness of coatings increases gradually. The coarser the discharging channels and the ejecting deposition are, the rougher the coating surface is. The micro-cracks on coatings are resulted from the stress concentration in coatings. The amount and morphology of micro-cracks, surface roughness and growth rate of coatings
are improved after substrates have been treated with the solid-solution that also benefit to energy saving of the micro-arc oxidation process. The residual stresses are released during the aging treatment, and the coating morphology is kept almost unchanged in terms of the amount and morphology of micro-cracks. And the microstructure of substrates has not been changed after the micro-arc oxidation treatment. More magnesium elements in AZ91D have participated in the micro-arc oxidation reaction conducted in silicate electrolyte. And silicon elements from the electrolyte also have diffused into magnesium substrates at the same time.

Key wordsmetallic materials    magnesium alloy    heat-treatment    micro-arc oxidation    coating    micro-crack
收稿日期: 2009-03-04     
ZTFLH: 

 

 
基金资助:

国家重点基础研究发展计划2007CB613700和教育部春晖计划Z2006-1-62002资助项目.

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