Effect of 4 wt. % Cr on microstructure, corrosion resistance and tribological properties of Fe₃Al-20 wt. % Al₂O₃ composites

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• 作者：Yaping Bai ; ^{jingpingxue2004@163.com} ; Jiandong Xing ; ^{jdxing@mail.xjtu.edu.cn} ; Shengqiang Ma ^{shengqiang012@163.com} ; Qian Huang ^{jiajiamao@126.com} ; Yuanyuan He ^{yuanyuanhe.717@stu.xjtu.edu.cn} ; Zhen Liu ^{liuzhen89628@163.com} ; Yimin Gao ^{ymgao@mail.xjtu.edu.cn}
• 关键词：Microstructure ; Corrosion resistance ; Tribological properties ; Fe3Al&ndash ; 20  ; wt. % Al2O3 composites ; Cr element
• 刊名：Materials Characterization
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：78
• 期：Complete
• 页码：69-78
• 全文大小：3160 K

文摘

Fe₃Al-20 wt. % Al₂O₃ ultrafine grained composites with 4 wt. % Cr were prepared by mechanical alloying inducing self propagating high temperature synthesis with subsequent plasma activated sintering. Microstructures of the composites were studied by X-ray diffraction, scanning electron microscopy, energy dispersive spectrum and transmission electron microscope. Then the relative density, room temperature hardness, static corrosion resistance and dry sliding wear behavior at a temperature range of 25 ¡ãC-800 ¡ãC of the sintered samples were tested and analyzed. The results showed that the composites had high hardness and a good microstructure with fine grain size, high relative density. The composites with 4 wt. % Cr amount also exhibited excellent comprehensive tribological properties at medium-high temperatures especially at a temperature above 500 ¡ãC, although the wear resistance did not be improved at 25 ¡ãC-500 ¡ãC. 4 wt. % Cr element addition improved the corrosion resistance of the composites significantly with the corrosion loss decreasing by 19.48 % .