崔丽,丁红园,陈俐,何恩光,顾长石

• 1:北京工业大学材料科学与工程学院
• 2:北京航空制造工程研究所高能束流加工技术研究室
• 3:上海船舶工艺研究所

摘要(Abstract)：

采用Nd:YAG激光对3 mm厚5A90铝锂合金薄板进行激光焊接,焊后对接头进行了固溶-时效处理,对热处理前后接头微观组织和显微硬度的分布进行了对比研究。研究结果表明,焊态5A90铝锂合金激光焊焊缝组织晶粒形态为等轴枝晶,未观察到强化相;经过焊后处理后,接头不同区域组织均呈现明显的晶界,焊缝金属晶粒形态转变为等轴晶,焊缝组织均匀性得到改善,并且焊缝金属晶粒内部弥散析出较多的δ'强化相。焊态下5A90铝锂合金激光焊焊缝的显微硬度低于母材,焊后热处理使焊缝金属中δ'强化相析出从而使焊缝的硬度显著提高。

关键词(KeyWords)： 铝锂合金;激光焊;焊后热处理;组织不均匀性

Abstract:

Keywords:

基金项目(Foundation): 航空科学基金(20125475002);; 北京市激光应用技术工程技术研究中心资助

作者(Author): 崔丽,丁红园,陈俐,何恩光,顾长石

DOI: 10.13289/j.issn.1009-6264.2014.10.012

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