Effect of Temperature and Phase Constitution on Kineties of La Diffusion
来源期刊：JOURNAL OF RARE EARTHS2002年第4期
论文作者：夏立芳 刘志儒 阎牧夫
Key words：rare earths; temperature; phase constitution; La diffusi on; kinetics;
Abstract: The diffusion of La in ε-Fe2～3N(ε)and γ′-Fe4N (γ′)phases pro duced by plasma nitriding was studied. It is found that with increasing nitridin g time, the ε phase continuously decomposes into γ′ one under employed experi mental conditions and compared with γ′ phase or ε+γ′ ones, the mono one ε has an impedient effect on depth of La diffusion. The growth of La layer in dua l phases and mono one follows an approximate exponential law and a parabolic one , respectively, and this kinetics law does not change with increasing temperatur e. The effect of increasing temperature in the range of 520 to 560 ℃ on La d iffusion depth is less than that of phase constitution change such as the decomp osition of ε phase into γ′ one.
夏立芳1，刘志儒1，阎牧夫1
(1.School of Materials Science and Engineering, Harbin Institut e of Technology, Harbin 150001, China)
Abstract:The diffusion of La in ε-Fe2～3N(ε)and γ′-Fe4N (γ′)phases pro duced by plasma nitriding was studied. It is found that with increasing nitridin g time, the ε phase continuously decomposes into γ′ one under employed experi mental conditions and compared with γ′ phase or ε+γ′ ones, the mono one ε has an impedient effect on depth of La diffusion. The growth of La layer in dua l phases and mono one follows an approximate exponential law and a parabolic one , respectively, and this kinetics law does not change with increasing temperatur e. The effect of increasing temperature in the range of 520 to 560 ℃ on La d iffusion depth is less than that of phase constitution change such as the decomp osition of ε phase into γ′ one.
Key words:rare earths; temperature; phase constitution; La diffusi on; kinetics;
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