| LIU Che-kai,LI Zhi-yong,PEI Xiao-long,YANG Liu-qing,XUE Tong-hui,REN Jie-liang.Microstructure and Analysis of Surfacing Al-Si Coating on AZ91D Magnesium Alloy[J],47(4):172-176 |
| Microstructure and Analysis of Surfacing Al-Si Coating on AZ91D Magnesium Alloy |
| Received:November 23, 2017 Revised:April 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.04.025 |
| KeyWord:AZ91D magnesium alloy ER4043 welding wire DC-PMIG surfacing intermetallic compound microstructure |
| Author | Institution |
| LIU Che-kai |
Welding Research Center, North University of China, Taiyuan , China |
| LI Zhi-yong |
Welding Research Center, North University of China, Taiyuan , China |
| PEI Xiao-long |
Welding Research Center, North University of China, Taiyuan , China |
| YANG Liu-qing |
Welding Research Center, North University of China, Taiyuan , China |
| XUE Tong-hui |
Welding Research Center, North University of China, Taiyuan , China |
| REN Jie-liang |
Welding Research Center, North University of China, Taiyuan , China |
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| Abstract: |
| The work aims to overlayAl-Si alloy coating on magnesium alloy, and analyze microstructure, composition and formation process of the transition zone on Al/Mg interface. A low-cost high-efficiency production process-direct current (DC) pulse metal inert gas (PMIG) shielded welding was used to deposit Al-Si alloy coating on AZ91D magnesium alloy using ER4043 wires (AlSi5). Microstructure, morphology and composition of the Mg/Al transition zone were measured with metallurgical microscope, scanning electron microscope, energy-dispersive spectrometer (EDS) and X-ray diffractometer(XRD). Formation process and composition of the transition zone were analyzedas well. The transition zone consisted of two regions. Region I was made up of Mg+Al12Mg17, Al12Mg17, Al12Mg17+Al3Mg2 and Al3Mg2, respectively. Irregular massive Mg2Si phase was dispersed in region I. The region II was mainly made up of columnar α-Al, with plenty of precipitated dotted Al3Mg2, and there was black dotted Mg2Si on grain boundary of columnar α-Al. Direct current pulse metal inert gas shielded welding can be used to prepare Al-Si coating on AZ91D magnesium alloy. There is a transition zone between substrate and coating. Relative Mg and Al content and composition are differentin positions of the transition zone.The precipitation of Mg2Si in region I and region II was different, which explained the different morphology. Mg2Si preferentially precipitated and grew tomassive Mg2Si in region I with relatively high magnesium content, while α-Al precipitated first in region II, and subsequently forms black dotted Mg2Si on grain boundary of α-Al. |
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