Abnormal particle-coarsening phenomena in friction stir repair welding of a 2219-T6 Al alloy: formation mechanisms

被引：3
作者：
Li, B. [1 ]
Shen, Y. [1 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Jiangsu, Peoples R China
来源：
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE | 2012年 / 226卷 / B2期
基金：
中国国家自然科学基金;
关键词：
friction stir welding; repair weld; Al2Cu particle; coarsening; formation mechanism; ALUMINUM-ALLOY;
D O I：
10.1177/0954405411405759
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Without any post-weld heat treatment, abnormal Al2Cu particle-coarsening phenomena have occurred in a friction stir repair weld of a 2219-T6 aluminium alloy. The size of the biggest particle in the dark bands of the 'onion rings' was about 150 mm. After a related investigation, three types of formation mechanisms were proposed to explain the abnormal phenomena: aggregation mechanism, diffusion mechanism I, and diffusion mechanism II. The aggregation mechanism was strongly related to the motion laws of plastic metal flow in the weld zone during friction stir repair welding. Diffusion mechanisms I and II were based on classical theories on the growth of precipitates in metallic material systems.
引用
收藏
页码：371 / 376
页数：6
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