Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 14    No. 5    October 2004

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Determination of isothermal sections of Ni-Cr-Nb ternary system
WANG Ri-chu(王日初), FENG Yan(冯 艳), 
JIN Zhan-peng(金展鹏), HUANG Bai-yun(黄伯云)

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:The isothermal sections of Ni-Cr-Nb ternary system at 1 323 K and 1 423 K were determined by means of diffusion triple and energy spectrum analysis (ESA). By analyzing the diffusion layers in the diffusion couples, the compounds forming in this system were identified. There are three similar compounds found at these two temperatures: Ni3Nb, NiNb and NbCr2-R, and four similar three-phase regions are found: (Ni)+(Cr)+Ni3Nb, Ni3Nb+NbCr2-R+NiNb, NbCr2-R+(Cr)+Ni3Nb, NbCr2-R+NiNb+(Nb). The results show that no phase transformation happens between these tow temperatures. But the solid solubilities of the binary compounds at 1 423 K become bigger than those at 1 323 K, especially the solid solubility of NbCr2-R. No ternary compound is observed.

 

Key words: Ni-Cr-Nb ternary system; diffusion triple; isothermal section

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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