Microstructure and Mechanical Properties of In-Situ SiO2-Reinforced Mechanically Alloyed CoCrFeNiMnX (X= 5, 20, 35 at.%) High-Entropy Alloys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F24%3A43929430" target="_blank" >RIV/60461373:22310/24:43929430 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/24:00598810 RIV/68407700:21340/24:00376537

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S2238785424017253?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2238785424017253?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmrt.2024.07.172" target="_blank" >10.1016/j.jmrt.2024.07.172</a>

Result language

angličtina

Original language name

Microstructure and Mechanical Properties of In-Situ SiO2-Reinforced Mechanically Alloyed CoCrFeNiMnX (X= 5, 20, 35 at.%) High-Entropy Alloys

Original language description

The CoCrFeNiMnX (X = 5, 20, and 35 at.%) alloys, reinforced with 5 at.% SiC powder, were prepared bymechanical alloying and spark plasma sintering. This preparation method resulted in microstructural refinementof the FCC solid solution grains, while the SiC addition reacted with residual oxygen to form homogeneouslydistributed ultrafine SiO2 particles. Additionally, the alloys contained Cr7C3 carbides, which were significantlylarger than the SiO2 particles and enriched with the alloy&apos;s elements, including Mn. Among the tested materials,the reinforced CoCrFeNiMn20 alloy exhibited the highest hardness and compressive yield strength (CYS),achieving 392 ± 9 HV30 or 476 ± 3 HVIT1 and 1024 ± 18 MPa, respectively. This alloy also maintained superiorCYS (956 ± 35 MPa) even after 100 hours of annealing at 800°C. The reduction in CYS after annealing wassmallest for the CoCrFeNiMn5 alloy (35 MPa) and increased with higher Mn content, highlighting Mn&apos;ssignificant role in diffusion-related processes. At elevated temperatures (600 and 800°C), the CoCrFeNiMn5alloy had the highest CYS of 190 ± 33 MPa, while the CoCrFeNiMn35 alloy had the lowest at 80 ± 6 MPa. Thistrend was also observed in wear rate tests, where the CoCrFeNiMn5 alloy had the lowest specific wear ratecoefficient of 3.54 ± 0.09 × 10-4 mm³ N⁻¹ m⁻¹. This was due to matrix softening and oxide lubrication withoutsignificant spalling. Thus, the CoCrFeNiMn5 alloy demonstrated superior mechanical properties and wearresistance under various conditions, making it a promising candidate for applications requiring high strengthand durability.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/GA21-11313S" target="_blank" >GA21-11313S: Design of nanocrystalline composite alloys with high entropy and controllable properties</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

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

Name of the periodical

Journal of Materials Research and Technology-JMR&amp;T

ISSN

2238-7854

e-ISSN

2214-0697

Volume of the periodical

32

Issue of the periodical within the volume

September-October 2024

Country of publishing house

BR - BRAZIL

Number of pages

14

Pages from-to

860-873

UT code for WoS article

001285724200001

EID of the result in the Scopus database

2-s2.0-85199866360