Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys

Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys

High-entropy alloys exhibit some interesting mechanical properties including an excellent resistance against softening at elevated temperatures. This gives high-entropy alloys (HEAs) great potential as new structural materials for high-temperature applications. In a previous study of the authors, ox...

Full description

Bibliographic Details
Main Authors: Lijia Chen, Kirsten Bobzin, Zheng Zhou, Lidong Zhao, Mehmet Öte, Tim Königstein, Zhen Tan, Dingyong He
Format: Article
Language:English
Published: MDPI AG 2018-11-01
Series:Metals
Subjects:
high-entropy alloy
heat treatment
microstructure
phase composition
Online Access:https://www.mdpi.com/2075-4701/8/11/974
id doaj-fde38b42d5ef4019983abf264c49813b
record_format Article
spelling doaj-fde38b42d5ef4019983abf264c49813b2020-11-24T21:33:18ZengMDPI AGMetals2075-47012018-11-0181197410.3390/met8110974met8110974Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy AlloysLijia Chen0Kirsten Bobzin1Zheng Zhou2Lidong Zhao3Mehmet Öte4Tim Königstein5Zhen Tan6Dingyong He7College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaSurface Engineering Institute, RWTH Aachen University, 52072 Aachen, GermanyCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaSurface Engineering Institute, RWTH Aachen University, 52072 Aachen, GermanySurface Engineering Institute, RWTH Aachen University, 52072 Aachen, GermanySurface Engineering Institute, RWTH Aachen University, 52072 Aachen, GermanyCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaCollege of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, ChinaHigh-entropy alloys exhibit some interesting mechanical properties including an excellent resistance against softening at elevated temperatures. This gives high-entropy alloys (HEAs) great potential as new structural materials for high-temperature applications. In a previous study of the authors, oxidation behavior of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> high-entropy alloys at T = 800 &#176;C, 900 &#176;C and 1000 &#176;C was investigated. Si-alloying was found to increase the oxidation resistance by promoting the formation of a continuous Al<sub>2</sub>O<sub>3</sub> layer, avoiding the formation of AlN at T = 800 &#176;C. Obvious phase changes were identified in the surface areas of both alloys after the oxidation experiments. However, the effects of heat treatment and Si-alloying on the phase transition in the bulk were not investigated yet. In this study, Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> high-entropy alloys were heat-treated at T = 800 &#176;C and T = 1000 &#176;C to investigate the effect of heat treatment on microstructure, phase composition and mechanical properties of both alloys. The results show that alloying Al<sub>0.6</sub>CrFeCoNi with Si caused a phase transition from dual phases consisting of BCC and FCC to a single BCC phase in an as-cast condition. Furthermore, increased hardness for as-cast and heat-treated samples compared with the Al<sub>0.6</sub>CrFeCoNi alloy was observed. In addition, the heat treatment facilitated the phase transition and the precipitation of the intermetallic phase, which resulted in the change of the mechanical properties of the alloys.https://www.mdpi.com/2075-4701/8/11/974high-entropy alloyheat treatmentmicrostructurephase composition
collection DOAJ
language English
format Article
sources DOAJ
author Lijia Chen
Kirsten Bobzin
Zheng Zhou
Lidong Zhao
Mehmet Öte
Tim Königstein
Zhen Tan
Dingyong He
spellingShingle Lijia Chen
Kirsten Bobzin
Zheng Zhou
Lidong Zhao
Mehmet Öte
Tim Königstein
Zhen Tan
Dingyong He
Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys
Metals
high-entropy alloy
heat treatment
microstructure
phase composition
author_facet Lijia Chen
Kirsten Bobzin
Zheng Zhou
Lidong Zhao
Mehmet Öte
Tim Königstein
Zhen Tan
Dingyong He
author_sort Lijia Chen
title Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys
title_short Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys
title_full Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys
title_fullStr Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys
title_full_unstemmed Effect of Heat Treatment on the Phase Composition, Microstructure and Mechanical Properties of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> High-Entropy Alloys
title_sort effect of heat treatment on the phase composition, microstructure and mechanical properties of al<sub>0.6</sub>crfeconi and al<sub>0.6</sub>crfeconisi<sub>0.3</sub> high-entropy alloys
publisher MDPI AG
series Metals
issn 2075-4701
publishDate 2018-11-01
description High-entropy alloys exhibit some interesting mechanical properties including an excellent resistance against softening at elevated temperatures. This gives high-entropy alloys (HEAs) great potential as new structural materials for high-temperature applications. In a previous study of the authors, oxidation behavior of Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> high-entropy alloys at T = 800 &#176;C, 900 &#176;C and 1000 &#176;C was investigated. Si-alloying was found to increase the oxidation resistance by promoting the formation of a continuous Al<sub>2</sub>O<sub>3</sub> layer, avoiding the formation of AlN at T = 800 &#176;C. Obvious phase changes were identified in the surface areas of both alloys after the oxidation experiments. However, the effects of heat treatment and Si-alloying on the phase transition in the bulk were not investigated yet. In this study, Al<sub>0.6</sub>CrFeCoNi and Al<sub>0.6</sub>CrFeCoNiSi<sub>0.3</sub> high-entropy alloys were heat-treated at T = 800 &#176;C and T = 1000 &#176;C to investigate the effect of heat treatment on microstructure, phase composition and mechanical properties of both alloys. The results show that alloying Al<sub>0.6</sub>CrFeCoNi with Si caused a phase transition from dual phases consisting of BCC and FCC to a single BCC phase in an as-cast condition. Furthermore, increased hardness for as-cast and heat-treated samples compared with the Al<sub>0.6</sub>CrFeCoNi alloy was observed. In addition, the heat treatment facilitated the phase transition and the precipitation of the intermetallic phase, which resulted in the change of the mechanical properties of the alloys.
topic high-entropy alloy
heat treatment
microstructure
phase composition
url https://www.mdpi.com/2075-4701/8/11/974
work_keys_str_mv AT lijiachen effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
AT kirstenbobzin effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
AT zhengzhou effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
AT lidongzhao effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
AT mehmetote effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
AT timkonigstein effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
AT zhentan effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
AT dingyonghe effectofheattreatmentonthephasecompositionmicrostructureandmechanicalpropertiesofalsub06subcrfeconiandalsub06subcrfeconisisub03subhighentropyalloys
_version_ 1725953806650310656

Similar Items