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论文类型：期刊论文

发表时间：2014-02-01

发表刊物：MATERIALS

收录刊物：SCIE、EI、PubMed、Scopus

卷号：7

期号：2

页面范围：1173-1187

ISSN号：1996-1944

关键字：Mg/Al welding; multicomponent alloy; intermetallics; microstructure evolution

摘要：Based on the idea of alloying welding seams, a series of Zn-xAl filler metals was calculated and designed for joining Mg/Al dissimilar metals by gas tungsten arc (GTA) welding. An infrared thermography system was used to measure the temperature of the welding pool during the welding process to investigate the solidification process. It was found that the mechanical properties of the welded joints were improved with the increasing of the Al content in the Zn-xAl filler metals, and when Zn-30Al was used as the filler metal, the ultimate tensile strength could reach a maximum of 120 MPa. The reason for the average tensile strength of the joint increasing was that the weak zone of the joint using Zn-30Al filler metal was generated primarily by alpha-Al instead of MgZn2. When Zn-40Al was used as the filler metal, a new transition zone, about 20 mu m-wide, appeared in the edge of the fusion zone near the Mg base metal. Due to the transition zones consisting of MgZn2- and Al-based solid solution, the mechanical property of the joints was deteriorated.