Microstructure evolution and thermal behavior of equimolar ultrafine-grained CuFe immiscible alloy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F26%3A0199813" target="_blank" >RIV/00216305:26210/26:0199813 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0925838825047449" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0925838825047449</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2025.183183" target="_blank" >10.1016/j.jallcom.2025.183183</a>

Result language

angličtina

Original language name

Microstructure evolution and thermal behavior of equimolar ultrafine-grained CuFe immiscible alloy

Original language description

Immiscible alloys, characterized by their positive enthalpy of mixing, offer unique opportunities to tailor material properties such as strength and thermal stability. This study investigates the microstructure and thermal behavior of an equimolar CuFe immiscible alloy prepared by a combination of mechanical alloying of elemental powders and sintering by the Spark Plasma Sintering method. Mechanical alloying enabled the mixing of mutually immiscible elements and the formation of metastable supersaturated solid solution. This solid solution decomposed into a dual-phase microstructure in the temperature range of 280 degrees C - 480 degrees C. Activation energy calculations indicated that the decomposition mechanism was a spinodal decomposition followed by phase growth. After sintering, an ultrafine-grained dual-phase microstructure consisting of Cu-rich and Fe-rich phases was formed. These phases showed varying levels of supersaturation, leading to the presence of some Fe-rich phases with an FCC crystal structure at room temperature. Moreover, this supersaturation led to a decrease in the BCC/FCC phase transformation temperature of the BCC Fe-rich phases by approximately 130 degrees C. During annealing at 980 degrees C, a partial decrease in the supersaturation of the phases occurred, which was reflected in an increase in the amount of BCC Fe-rich phases. However, the temperature shift of the BCC/FCC phase transformation was retained. The grain size after annealing increased from 0.49 mu m to 0.67 mu m, which can be described as excellent thermal stability considering the high annealing temperature (90 % of the melting temperature). This exceptional thermal stability stems from the immiscible nature of the alloy, which hinders grain growth.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Alloys and Compounds

ISSN

0925-8388

e-ISSN

1873-4669

Volume of the periodical

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Issue of the periodical within the volume

1040

Country of publishing house

CH - SWITZERLAND

Number of pages

11

Pages from-to

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UT code for WoS article

001568891300041

EID of the result in the Scopus database

2-s2.0-105015037139