The investigation of the oriented precipitate-free zone in high strength aluminum alloy welds

Acta Metall Sin

2008, Vol. 44

Issue (1): 91-97 DOI:

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The investigation of the oriented precipitate-free zone in high strength aluminum alloy welds

许良红 Xu Liang－Hong;tian zhiling Tian

钢铁研究总院结构

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许良红 Xu Liang－Hong; tian zhiling Tian. The investigation of the oriented precipitate-free zone in high strength aluminum alloy welds. Acta Metall Sin, 2008, 44(1): 91-97 .

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Abstract The microstructure in the partially melted zone of an arc-welded 20mm thickness 2519-T87 high strength aluminum alloy is investigated, an oriented precipitate-free zone is found behind the grain boundary, and this zone is not uniformly surrounding the grain, but usually oriented toward the fusion line. The formation mechanism of this zone is also studied. Results indicate that the mechanism of grain boundary liquid film migration is favored the formation of the precipitate free zone, the driving forces include coherency strain energy, the differential strain energy between the two grains induced by the elastic stresses generated during welding and differential surface energy due to grain boundary curvature. And with the increase of heat input, the thickness of the precipitate free zone increase. The precipitate free zone is harmful to the mechanical property of partially melted zone, and the fractography of PMZ showing the intergranular fracture.

Key words: high strength aluminum alloy partially melted zone driving force grain boundary migration

Received: 20 March 2007

ZTFLH:	TG146.2
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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2008/V44/I1/91

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