Paper Title:
Microstructural Evolution during Friction Stir Welding of Ultrafine Grained Al Alloys
  Abstract

Recently, several metallic materials with ultrafine-grained structures and characterized by high strength and toughness have been developed. When these ultrafine-grained materials are practically used, welding and joining processes are required. However, conventional fusion welding processes result in deterioration of the good mechanical properties of these ultrafine-grained materials due to the drastic grain growth of the ultrafine grains. On the other hand, friction stir welding (FSW) is a solid-state joining process having lower heat-input than fusion welding processes, enabling formation of a fine grain structure in the stir zone. Thus, this process would effectively alleviate deterioration of mechanical properties of the ultrafine-grained materials. The authors applied FSW to ultrafine-grained Al alloys and then examined the microstructural features associated with hardness in the friction stir welds. The present paper reviews microstructural evolution of ultrafine-grained Al alloys, produced by equal channel angular pressing (ECAP) and accumulative roll-bonding (ARB), during FSW.

  Info
Periodical
Materials Science Forum (Volumes 503-504)
Edited by
Zenji Horita
Pages
169-174
DOI
10.4028/www.scientific.net/MSF.503-504.169
Citation
Y. S. Sato, M. Urata, Y. Kurihara, S.H.C. Park, H. Kokawa, K. Ikeda, N. Tsuji, "Microstructural Evolution during Friction Stir Welding of Ultrafine Grained Al Alloys", Materials Science Forum, Vols. 503-504, pp. 169-174, 2006
Online since
January 2006
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$32.00
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