YANG Qiqin LIU Guankun TONG Yexiang LIANG Guangchao Zhongshan University
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Guangzhou
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China
金属学报(英文版)
The cyclic voltammetry,electrode potential-time curve after potentiostatic electrolysis, potential-step method and X-ray diffraction were used to study the electrode process of Pr(Ⅲ)reduced on Ni electrode in molten NaCl-KCl-PrCl_3.The PrNi_5 forms at first and then the intermetallic compounds of Pr-Ni containing more Pr form in sequence.The metallic Pr deposits at last.The standard free energies of formation for PrNi_5 determined are-123.6,-118.9 and-114.4 kJ mol~(-1) at 1023,1073 and 1123 K respectively.The diffusion coefficient of Pr into PrNi_5 phase determined is 3×10~(-11) cm~2 s~(-1) at 1073 K.
关键词:
electrochemical alloying
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null
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Scripta Materialia
A recent comment on a previously published paper addressed the invalid explanation of the off diagonal interdiflusion coefficients of the beta-Ni(Al,Cr) phase in the Ni-Cr-Al system according to the symmetric property of the thermodynamic matrix. In this paper, the experimental data presented by Hou et al. was reanalyzed and the interdiffusion coefficient matrix was estimated again. The results of the analysis have been discussed in terms of a brief reply to the comments of Liu and Liang. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词:
Diffusion;Intermetallic compound;Ni-Cr-Al
