First- and second-order phase transitions in Fe-(17-19)at.%Ga alloys

被引：18
|
作者：
Mohamed, A. K. [1 ]
Cheverikin, V. V. [1 ]
Medvedeva, S. V. [1 ]
Bobrikov, I. A. [2 ]
Balagurov, A. M. [2 ,3 ]
Golovin, I. S. [1 ]
机构：
[1] Natl Univ Sci & Technol MISIS, Leninsky Ave 4, Moscow 119049, Russia
[2] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Russia
[3] Lomonosov Moscow State Univ, Moscow 119991, Russia
来源：
MATERIALS LETTERS | 2020年 / 279卷
基金：
俄罗斯科学基金会;
关键词：
Fe-Ga; Phase transformations; Cooling rates; Grain boundaries; TTT diagram; Diffusion; FE-GA;
D O I：
10.1016/j.matlet.2020.128508
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structure of the Fe-(17.5-19.5)at.%Ga alloys in as-cast and nearly equilibrium states is studied using XRD, ND, and EBSD. In disagreement with the existing phase diagrams, the long-term isothermally annealed at 450-500 degrees C Fe-17.5%Ga alloy has a two-phase structure with two co-existing ferromagnetic phases: bcc-originated A2(D0(3)) as a matrix and a fcc-originated Al (L1(2)) needle-shaped precipitates. The phase transitions during cooling of 17.5 and 19.5%Ga alloys from the A2 range of the phase diagram with different cooling rates were used to plot, at least partly, Time-Temperature-Transformation (TTT) diagrams. The critical cooling rates for starting first- and second-order transitions are determined for the Fe-19.5%Ga alloy. The effect of long-term annealing on magnetostriction is reported. (C) 2020 Elsevier B.V. All rights reserved.
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页数：4
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