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| DIFFUSION OF PENETRATED ATOMS IN MATRIX DURING DOUBLE GLOW PLASMA SURFACE ALLOYING |
| LI Zhong-hou LIU Xiao-ping SU Yong-an XU Zhong (Taiyuan University of Technology; Taiyuan 030024) |
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Abstract In this article, the diffusion geometry in double glow plasma surface alloying(DGPSA) was treated as vapor-solid diffusion couple. The concentration distribution of tungsten in the commercially pure iron sample after DGPSA was determined by SEM. The regression equation describing concentration profile for tungsten, y(x) = 2.3698 - 7.8711 ×10-3x + 6.377 × 10-6x2, where y-the concentration of W in α-Fe and x-the distance from sample surface, was established by multi-element regression. The plot of ln[-y'(x)] versus x2 was given, on which all the experimental points fell on a straight line except a few points near x=0. These results illustrated that the vapor-solid diffusion couple was reasonable for diffusion geometry of plasma surface alloying. The diffusivity for tungsten in α-Fe was calculated from the plot of ln[-y'(x)]versus x2.
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Received: 25 February 1998
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1 李忠厚,刘小平等.机械工程材料,1995(2): 26
2 Murch G E, Nowick A S. Diffusion in crystalline solids, Academic Press INC, 1984, p.7
3 Murch G E, Nowick A S. Diffusion in crystalline solids, Academic Press INC, 1984, p.12
4 Li Chengji, Xu Zhong. Surface Engineering, 1987, 13(4): 311 |
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