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论文类型：期刊论文

发表时间：2013-04-01

发表刊物：MATERIALS & DESIGN

收录刊物：SCIE、EI

卷号：46

页面范围：419-425

ISSN号：0261-3069

关键字：Non-ferrous metals and alloys; Welding; Fracture; Microstructure

摘要：Gas tungsten arc butt welding of Mg-Al filling with Zn filler metal without and with Al foils in different thicknesses was carried out. Additional Al element was introduced into the fusion zone to accurately modulate microstructure and composition of the welding seam. Microstructures and mechanical properties of the welded joints were examined. Results show that the addition of appropriate quantity of Al element increases the content of Al-based solid solution in the fusion zone near the Mg base metal. The solid solution can eliminate the stress concentration and hinder crack propagation, so the tensile strengths of the joints are improved. However, the immoderate quantity of Al element will lead to the formation of partially Al-rich zones and deteriorate the mechanical property of the joints. (C) 2012 Elsevier Ltd. All rights reserved.