期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 8, 期 3, 页码 3270-3280出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmrt.2019.05.017
关键词
Magnetic pulse welding; Magnesium alloys; Aluminum alloys; Intended service temperature
资金
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51621004]
- Key Research and Development Program of Hunan Province [2017GK2090]
The microstructure and mechanical properties of Al/Mg welded joints after heat preservation at different temperatures were examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and mechanical property test. The results showed that the treatment has no obvious effects on the morphology of the Al/Mg welding interface, but the morphology of the grain structure on the magnesium alloy side was improved. When the temperature was below 150 degrees C, there was no significant change in the microstructure and mechanical properties of Al/Mg welded joint. While, the intermetallic compound layer composed of Al12Mg17 was formed at the interface when the temperature was raised to 200 degrees C. The welding interface generated two intermetallic compound layers composed of Al12Mg17 and Al3Mg2 as the temperature reached to 250 degrees C. Intermetallic compounds severely affected the strength of the welded joint because of greater brittleness. In order to maintain reliable performance, the use temperature of the Al/Mg welded structural parts should not exceed 150 degrees C. (C) 2019 The Authors. Published by Elsevier B.V.
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