Open AccessStudy on the interaction mechanism in the Pr–Fe–As system
Author(s) -
Lihua He,
Run Huang,
Jinxiao Luo,
Xiaodong Lv,
Juncheng Mao,
Jinzhu Zhang
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abc58d
Subject(s) - solubility , ternary operation , scanning electron microscope , penetration (warfare) , ternary numeral system , diffusion , crystallography , chemistry , diffraction , atmospheric temperature range , materials science , analytical chemistry (journal) , thermodynamics , composite material , physics , optics , chromatography , operations research , computer science , engineering , programming language
The influence of different heat preservation temperatures on the interaction in the Pr–Fe–As ternary system and the principle for generating the interaction products of the Pr–Fe–As ternary system were studied by metallographic microscopy, scanning electron microscopy, and x-ray diffraction. Results showed that the α -Fe with As (i.e., the compound formed when the solubility of As in Fe exceeds the maximum solubility), Fe 2 As, PrAs, and a small amount of Fe 17 Pr 2 were the main products when the atomic ratio of Pr: As is 1:3 and heat preservation for 20 h at 1173 K, 1223 K and 1273 K. PrAs decreased as the temperature increased, while the α -Fe with As decreased as the temperature decreased, and Fe 2 As increased gradually as α -Fe with As decreased. In the Pr–Fe–As ternary system, the diffusion of Pr is mainly short-range diffusion and double vacancies, and the PrAs develops in the margin of the penetration region, preventing the diffusion of As in Fe.