Local oxynitriding of AZ31 magnesium alloy by atmospheric-pressure plasma treatment at room temperature  

作　　者：Kenta Nakazawa Tatsuki Ohashi Shotaro Saiki Shoichi Kikuchi 

机构地区：[1]Department of Mechanical Engineering,Faculty of Engineering,Shizuoka University,3-5-1,Johoku,Naka-ku,Hamamatsu,432-8561,Japan [2]Graduate School of Integrated Science and Technology,Shizuoka University,3-5-1 Johoku,Naka-ku,Hamamatsu,432-8561,Japan

出　　处：《Journal of Magnesium and Alloys》2022年第7期1878-1886,共9页镁合金学报（英文）

基　　金：the Tanikawa Fund Promotion of Thermal Technology and the Light Metal Education Foundation。

摘　　要：A surface-hardening treatment for AZ31 magnesium alloy using an atmospheric-pressure plasma jet(APPJ)at room temperature was developed.Magnesium is a potential engineering material because it is lightweight;however,magnesium alloys are difficult to heat-treat because of their low flaming temperature.Magnesium alloy specimens were irradiated with a localized atmospheric-pressure plasma jet generated by dielectric-barrier discharge for 180 s in air.The APPJ excited oxygen and nitrogen molecules in the ambient air,resulting in the formation of an oxynitrided layer;oxygen and nitrogen diffusion layer,on the surface of the magnesium alloy.The hardness and elemental distribution for the treated surface were examined.The top surface of the APPJ-treated magnesium alloy achieved a maximum hardness of 108 HV,which was~1.7 times greater than that of the untreated surface.Elemental analysis using an electron-probe microanalyzer revealed strong oxygen and nitrogen signals corresponding to the hardened region of the magnesium alloy,meaning that the hardness increased as a result of the formation of the oxynitrided layer.The proposed APPJ treatment is a promising approach for locally hardening magnesium alloys without using a heat treatment.

关 键 词：Magnesium alloy Oxynitriding Atmospheric-pressure plasma jet HARDNESS Surface modification DIFFUSION 

分 类 号：TG178[金属学及工艺—金属表面处理]