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

Fingerprint

welded joints
Coarsening
Welds
friction
Friction
Grain refinement
Crystal microstructure
Grain growth
Volume fraction
Thermodynamic stability
Temperature
grain size
wrought alloys
thermal stability
Hot Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

Cite this

Lin, C. Y., Lui, T-S., & Chen, L. H. (2012). A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure. In Light Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition (pp. 527-532). (TMS Light Metals).
Lin, Chun Yi ; Lui, Truan-Sheng ; Chen, Li Hui. / A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure. Light Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition. 2012. pp. 527-532 (TMS Light Metals).
@inproceedings{fd2ec5cb3814453ca6184181b2ff856a,
title = "A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure",
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.",
author = "Lin, {Chun Yi} and Truan-Sheng Lui and Chen, {Li Hui}",
year = "2012",
month = "5",
day = "16",
language = "English",
isbn = "9781118291399",
series = "TMS Light Metals",
pages = "527--532",
booktitle = "Light Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition",

}

Lin, CY, Lui, T-S & Chen, LH 2012, A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure. in Light Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition. TMS Light Metals, pp. 527-532, Light Metals 2012 - TMS 2012 Annual Meeting and Exhibition, Orlando, FL, United States, 12-03-11.

A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure. / Lin, Chun Yi; Lui, Truan-Sheng; Chen, Li Hui.

Light Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition. 2012. p. 527-532 (TMS Light Metals).

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

TY - GEN

T1 - A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure

AU - Lin, Chun Yi

AU - Lui, Truan-Sheng

AU - Chen, Li Hui

PY - 2012/5/16

Y1 - 2012/5/16

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84860845041&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860845041&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84860845041

SN - 9781118291399

T3 - TMS Light Metals

SP - 527

EP - 532

BT - Light Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition

ER -

Lin CY, Lui T-S, Chen LH. A study of microstructural stability of friction stir welded joints of Al-Mg alloys during subsequent thermal exposure. In Light Metals 2012 - Proceedings of the Technical Sessions Presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting and Exhibition. 2012. p. 527-532. (TMS Light Metals).