γ-TiAl合金表面辉光等离子渗Cr层的组织与性能  

Microstructure and properties of glow plasma chromized layer on γ-TiAl based alloy surface

作　　者：马士剑[1] 张平则[1] 吴红艳[1] 徐重[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211100

出　　处：《金属热处理》2008年第3期67-69,共3页Heat Treatment of Metals

基　　金：江苏省自然科学基金(No.BK2005128)

摘　　要：利用双层辉光等离子表面渗金属技术(DGPSAT)在γ-TiAl合金表面进行等离子渗Cr处理,采用OM、SEM、EDS和XRD分析了渗Cr合金层的显微组织、化学成分及其相组成,并测试了其显微硬度分布和耐磨性。结果表明,γ-TiAl合金经双层辉光等离子渗Cr处理后,其表面形成以Al8Cr5、TiAl、Ti3Al、Cr等相组成的合金层,有效厚度约为35μm,渗层与基体结合牢固;渗Cr层组织成分及其横截面显微硬度由表及里均呈梯度分布;其摩擦磨损性能亦得到提高。Plasma chromizing on the surface of γ-TiAl alloy was performed by double glow technique. The microstructure, composition and phases of the chromized layer were analyzed using OM, SEM, EDS and XRD, respectively. The microhardness and wear resistance were tested. The results show that the alloy layer consists of Al8Cr5, TiAl, Ti3 Al and Cr form after chromizing treatment. The chromized layer with the effective thickness of about 35 μm was firmly bonded to the substrate. The composition and micro-hardness of the chromized layer displayed gradient distribution from the surface alloyed layer to the substrate. The friction and wear resistance are greatly improved.

关 键 词：γ-TiAl金属间化合物 辉光离子渗Cr 摩擦 磨损 

分 类 号：TG156.8[金属学及工艺—热处理] TG174.445[金属学及工艺—金属学]