Formation of a face-centered-cubic metastable phase in the Fe-Nb system by solid-state reaction

被引：4

作者：

Lin, C ^{[1
]}

Liu, JB ^{[1
]}

Yang, GW ^{[1
]}

Liu, BX ^{[1
]}

机构：

[1] Tsing Hua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 283卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

solid-state reaction; Fe-Nb alloys; multilayered films; metastable phase;

D O I：

10.1016/S0925-8388(98)00913-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In the bcc-structured Fe-Nb system, two types of metastable crystalline phases, i.e., an fee (namely fcc-I) and an enlarged fee (namely fee-II) were formed by solid-state reaction at medium temperatures in Fe-Nb multilayered films with 15-80 at% Nh. The fcc-I was only found in the Fe20Nb80 films. The fee-II phase was found in all the multilayered films, i.e. Fe20Nb80, Fe35Nb65, Fe55Nb45 and Fe85Nb15. However, the lattice constant of the formed fee-II decreased with increasing overall Fe atomic concentration in the as-deposited films. Thermodynamically, the formation of the fee phases are favored in the range of 15-83 at% Nh, based on a constructed Gibbs free energy diagram of Fe-Nb system. Kinetically, the formation of the fee phases can take place through a bcc-fce transition by shearing and then sliding. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：225 / 230

页数：6

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