铝合金厚板搅拌摩擦焊焊缝局部金属的塑性流动特征

doi:10.11896/j.issn.1005-023X.2017.024.029

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Abstract 0.02 mm thick Cu foil was used as tracer material when 7075-T6 aluminum alloy thick plates with a thickness of 20 mm were friction stir welded using the tool with a triangle plane tapered pin. The vertical temperature distribution was measured and the distribution of tracer material in the weld seam was observed, and the plastic flow characteristic of the local material was analyzed. The results show that the peak temperature decreases gradually along the vertically downward direction of the weld seam, and the temperature difference between the top and the root is about 90 ℃. Also, the temperature on the advancing side (AS) is 15 ℃ higher than that on the retreating side (RS) for two symmetric points at the same thickness of the weld. Moreover, on the weld top the Cu foil is broken up into small particles and distributed in the nugget zone (NZ), while Cu with flake structure is presented on the weld root of the NZ on the AS. It is interesting that the NZ consists of many onion rings, and in NZ the metal shows textured structure, which might be ascribed to the change of material flow along the vertical direction of the weld seam.

Key words： aluminum alloy thick plate friction stir welding temperature distribution local material plastic flow

Published: 08 May 2018

CLC number:

TG453.9

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	Articles by authors
	MAO Yuqing
	KE Liming
	CHEN Yuhua
	LIU Fencheng

Cite this article:

MAO Yuqing,KE Liming,CHEN Yuhua, et al. Plastic Flow Characteristic of Local Material in the Friction Stir Weld Seam of Aluminum Alloy Thick Plates[J]. Materials Reports, 2017, 31(24): 145-149.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.024.029 OR http://www.mater-rep.com/EN/Y2017/V31/I24/145

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