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Acta Metall Sin  2013, Vol. 49 Issue (2): 251-256    DOI: 10.3724/SP.J.1037.2012.00557
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MICROSTRUCTURE AND PROPERTIES OF METAMORPHIC LAYER FORMED ON Mg-RE ALLOY IN MICRO-EDM PROCESS
SUN Shufa 1, 2), DI Shichun 1), LU Pengxiang 1), WEI Dongbo 1),YU Jie 1), GUO Yupeng 1)
1) School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 15000
12) Institute of Engineering and Technology, Northeast Forestry University, Harbin 150040
Cite this article: 

SUN Shufa, DI Shichun, LU Pengxiang, WEI Dongbo,YU Jie, GUO Yupeng. MICROSTRUCTURE AND PROPERTIES OF METAMORPHIC LAYER FORMED ON Mg-RE ALLOY IN MICRO-EDM PROCESS. Acta Metall Sin, 2013, 49(2): 251-256.

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Abstract  

In this work, the Mg-RE alloy metamorphic layer was formed in the micro-EDM process in different process parameters. The morphology and composition of the metamorphic layer were detected by SEM and XPS, the hardness of the metamorphic layer was measured by a nanoindentor, the corrosion resistance property was investigated by using a potentiodynamic polarization test. The results show that there are microcracks on the surface of metamorphic layer, the microcracks can be reduced by decreasing processing voltage and current, and it can be further eliminated by increasing pulse wide and pulse interval. The oxidation caused on the surface of metamorphic layers in the micro-EDM process in three different dielectrics among which there was significantly electrochemical corrosion on the surface in deionized water. The hardness of metamorphic layer is enhanced compared to the substrate of Mg-RE alloy, and its maximum value is about 1.664 GPa. The potentiodynamic polarization test shows that the corrosion resistance of the Mg-RE alloy was improved significantly due to the existence of the metamorphic layer.

Key words:  Mg-RE alloy      micro-EDM      metamorphic layer      hardness, corrosion     
Received:  21 September 2012     

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00557     OR     https://www.ams.org.cn/EN/Y2013/V49/I2/251

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