Microstructural Evolution during Friction Stir Welding of Ultrafine Grained Al Alloys

Abstract:

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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 et al., "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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Price:

$35.00

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