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论文类型：期刊论文

发表时间：2015-10-01

发表刊物：INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING

收录刊物：SCIE、Scopus

卷号：16

期号：11

页面范围：2321-2326

ISSN号：2234-7593

关键字：Mg/Al welding; Ti; Intermetallic; Microstructure evolution

摘要：Based on the idea of alloying welding seam, a series of Zn-30Al-xTi filler metal was used to join Mg/Al dissimilar metals by tungsten inert gas welding, where the x was 0, 0.05, 0.1, 0.5, and 1, respectively. The effect of various Ti content on the microstructure and the mechanical property of Mg-Al butt joints was investigated. Results indicated that the fusion zones of the joints were mainly composed of alpha-Al, MgZn2 and Al-Zn eutectics when the Ti content was 0.05, 0.1 and 0.5 wt.%, and Al3Ti compounds could precipitate first and act as nucleuses during solidification process when the Ti content was appropriate. The mechanical property of the weld joints improved consistently to the increasing content of Ti. The optimum average tensile strength of the joints reached 148 MPa when Zn-30Al-0.5Ti was used, but the average tensile strength decreased again when Zn-30Al-1Ti was used.