Abstract
Cr-W alloying layer was prepared on the TiAl alloy by using the double glow plasma surface alloying technology (DGP). The hardness tests show that the surface micro-hardness of Cr-W alloying layer is greatly increased and the micro-hardness of diffusion layer is 648.8 HV0.1, increased two times more than the matrix. The scratch tests show that the bond between TiAl alloy and Cr-W alloying layer is very good and the layer at least can withstand 70 N vertical load. The friction and wear at room temperature tests show that the friction coefficientof Cr-W alloying layer is about 0.43, that of the matrix is 0.70. The wear scar is narrow, and the depth is small. The wear weight loss and wear rate relative to the matrix decrease greatly. The friction and wear at 500 tests show that the friction coefficient of Cr-W alloying layer is about 0.50, that of the body is 0.75. The wear weight loss and wear rate of Cr-W alloying layer are all less than the matrix.
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