PALS Investigation of Structural Vacancies During Phase Transitions in Fe-27Ga and Fe-27Ga-0.1Tb Alloys

被引：2
|
作者：
Dubov, L. Yu [1 ,2 ]
Shtotsky, Yu, V [1 ,2 ]
Stepanov, S., V [1 ,2 ,3 ]
Akmalova, Yu A. [2 ]
Golovin, I. S. [4 ]
Palacheva, V. V. [4 ]
机构：
[1] Natl Res Ctr Kurchatov Inst ITEP, Moscow 117218, Russia
[2] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia
[3] Lomonosov Moscow State Univ, Chem Dept, GSP 1, Moscow 119991, Russia
[4] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia
来源：
18TH INTERNATIONAL CONFERENCE ON POSITRON ANNIHILATION (ICPA-18) | 2019年 / 2182卷
关键词：
D O I：
10.1063/1.5135858
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Good mechanical properties and relatively low switching magnetic field make Fe-Ga alloys very useful magnetostrictive material for wide range of practical applications. Doping with rare-earth elements (such as Tb) can significantly increase magnetostriction, because Tb rearranges vacancy structure during phase transitions in Fe-27Ga alloys. It was found that A2 and D0(3) structures in Fe-27Ga have high density of Fe-monovacancies with the positron lifetime approximate to 180 ps regardless of the presence of Tb. Transition into L12 structure is accompanied by formation of a significant number of larger vacancy defects, which increases the e+ lifetime by 5 /0. Addition of 0.2% Tb suppress formation of these large defects at annealing temperatures of 400-550 degrees C. Presence of Tb also decreases concentration of vacancies in D0(19) structure. After annealing at 650 degrees C D0(19) volume fraction in Fe-27Ga-0.2Tb decreases to 60 %, (according to the positron measurements) against 95 % in Fe-27Ga. In both alloys at 700 degrees C number of monovacancies increases dramatically during formation of the bcc B2 phase.
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页数：4
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