Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle

Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle

We propose a novel strengthening strategy that involves the introduction of a high-entropy nanoscale phase (HENP) and semicoherent refractory nanoparticle into the A2 matrix of an as-cast equimolar HfMoNbTaTi refractory high-entropy alloy (RHEA). Based on the design concept of low difference in elem...

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Autores principales: Cheng Yang, Huakang Bian, Kenta Aoyagi, Yuichiro Hayasaka, Kenta Yamanaka, Akihiko Chiba
Formato: article
Lenguaje:EN
Publicado: Elsevier 2021
Materias:
HfMoNbTaTi
Refractory high-entropy alloy
High-entropy nanoscale phase
Precipitation strengthening
Semicoherent interface
High temperature properties
Materials of engineering and construction. Mechanics of materials
TA401-492
Acceso en línea:https://doaj.org/article/f0ebedde0b7048f781535eaec15f2379
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spelling oai:doaj.org-article:f0ebedde0b7048f781535eaec15f23792021-11-18T04:43:28ZSynergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle0264-127510.1016/j.matdes.2021.110248https://doaj.org/article/f0ebedde0b7048f781535eaec15f23792021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0264127521008030https://doaj.org/toc/0264-1275We propose a novel strengthening strategy that involves the introduction of a high-entropy nanoscale phase (HENP) and semicoherent refractory nanoparticle into the A2 matrix of an as-cast equimolar HfMoNbTaTi refractory high-entropy alloy (RHEA). Based on the design concept of low difference in elemental melting points, equiaxed grains with slight segregation were obtained. The HENP was characterized as a disordered near-coherent structure with a composition significantly similar to the matrix that differed from traditional coherent intermetallics. The heterogeneous nucleation was attributed to the aggregation of the largest Hf atoms and interstitial complexes in the locally distorted matrix. Moreover, the refractory nanoparticle was inferred to be hafnium nitride, possessing high thermal stability and establishing a semicoherent interface with the matrix. Notably, the interface was lined with a Ti film of one or two atomic layers. Furthermore, owing to the high melting point and precipitation strengthening, a highest yield strength (851 MPa) was obtained at 1200 °C compared with those reported cast RHEAs. At room temperature, a high yield strength (1713 MPa) was revealed mainly due to the combined effect of solid-solution strengthening and precipitation strengthening. The present study provides a new pathway for the future design of HEAs.Cheng YangHuakang BianKenta AoyagiYuichiro HayasakaKenta YamanakaAkihiko ChibaElsevierarticleHfMoNbTaTiRefractory high-entropy alloyHigh-entropy nanoscale phasePrecipitation strengtheningSemicoherent interfaceHigh temperature propertiesMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials & Design, Vol 212, Iss , Pp 110248- (2021)
institution DOAJ
collection DOAJ
language EN
topic HfMoNbTaTi
Refractory high-entropy alloy
High-entropy nanoscale phase
Precipitation strengthening
Semicoherent interface
High temperature properties
Materials of engineering and construction. Mechanics of materials
TA401-492
spellingShingle HfMoNbTaTi
Refractory high-entropy alloy
High-entropy nanoscale phase
Precipitation strengthening
Semicoherent interface
High temperature properties
Materials of engineering and construction. Mechanics of materials
TA401-492
Cheng Yang
Huakang Bian
Kenta Aoyagi
Yuichiro Hayasaka
Kenta Yamanaka
Akihiko Chiba
Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle
description We propose a novel strengthening strategy that involves the introduction of a high-entropy nanoscale phase (HENP) and semicoherent refractory nanoparticle into the A2 matrix of an as-cast equimolar HfMoNbTaTi refractory high-entropy alloy (RHEA). Based on the design concept of low difference in elemental melting points, equiaxed grains with slight segregation were obtained. The HENP was characterized as a disordered near-coherent structure with a composition significantly similar to the matrix that differed from traditional coherent intermetallics. The heterogeneous nucleation was attributed to the aggregation of the largest Hf atoms and interstitial complexes in the locally distorted matrix. Moreover, the refractory nanoparticle was inferred to be hafnium nitride, possessing high thermal stability and establishing a semicoherent interface with the matrix. Notably, the interface was lined with a Ti film of one or two atomic layers. Furthermore, owing to the high melting point and precipitation strengthening, a highest yield strength (851 MPa) was obtained at 1200 °C compared with those reported cast RHEAs. At room temperature, a high yield strength (1713 MPa) was revealed mainly due to the combined effect of solid-solution strengthening and precipitation strengthening. The present study provides a new pathway for the future design of HEAs.
format article
author Cheng Yang
Huakang Bian
Kenta Aoyagi
Yuichiro Hayasaka
Kenta Yamanaka
Akihiko Chiba
author_facet Cheng Yang
Huakang Bian
Kenta Aoyagi
Yuichiro Hayasaka
Kenta Yamanaka
Akihiko Chiba
author_sort Cheng Yang
title Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle
title_short Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle
title_full Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle
title_fullStr Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle
title_full_unstemmed Synergetic strengthening in HfMoNbTaTi refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle
title_sort synergetic strengthening in hfmonbtati refractory high-entropy alloy via disordered nanoscale phase and semicoherent refractory particle
publisher Elsevier
publishDate 2021
url https://doaj.org/article/f0ebedde0b7048f781535eaec15f2379
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AT huakangbian synergeticstrengtheninginhfmonbtatirefractoryhighentropyalloyviadisorderednanoscalephaseandsemicoherentrefractoryparticle
AT kentaaoyagi synergeticstrengtheninginhfmonbtatirefractoryhighentropyalloyviadisorderednanoscalephaseandsemicoherentrefractoryparticle
AT yuichirohayasaka synergeticstrengtheninginhfmonbtatirefractoryhighentropyalloyviadisorderednanoscalephaseandsemicoherentrefractoryparticle
AT kentayamanaka synergeticstrengtheninginhfmonbtatirefractoryhighentropyalloyviadisorderednanoscalephaseandsemicoherentrefractoryparticle
AT akihikochiba synergeticstrengtheninginhfmonbtatirefractoryhighentropyalloyviadisorderednanoscalephaseandsemicoherentrefractoryparticle
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