A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure

Chun Yi Lin, Truan-Sheng Lui, Li Hui Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Al-Mg wrought alloys such as Al-2.6Mg, Al-4.6Mg and AI-4.6Mg- lSi were friction stir welded and a subsequent thermal exposure was carried out in this study. The effects of elements addition and exposure temperature on the microstructural stability of welded zone were investigated. A grain refinement was found in the weld zone of each alloy and the average grain size of friction stir welded Al-2.6Mg, Al-4.6Mg and Al-4.6Mg-1Si was 10.1μm, 7.4μm and 4.7μm, respectively. Thermal exposure caused drastic coarsening of grains in the stirred zone and abnormal grain growth initiated at some preferred sites such as upper surface and bottom. The volume fraction of coarsening grains increased with increasing exposure temperature; however an unexpected decrease in grain size was found at 550°C in compare to 500°C. Besides, the addition of Mg and Si deteriorated the thermal stability of grain structure in stirred zone.

Original languageEnglish
Title of host publicationLight Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition
Pages527-532
Number of pages6
Publication statusPublished - 2012 May 16
EventLight Metals 2012 - TMS 2012 Annual Meeting and Exhibition - Orlando, FL, United States
Duration: 2012 Mar 112012 Mar 15

Publication series

NameTMS Light Metals
ISSN (Print)0147-0809

Other

OtherLight Metals 2012 - TMS 2012 Annual Meeting and Exhibition
CountryUnited States
CityOrlando, FL
Period12-03-1112-03-15

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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