Outstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure

Abstract A (Mo0.85Nb0.15)Si2 crystal with an oriented, lamellar, C40/C11b two-phase microstructure is a promising ultrahigh-temperature (UHT) structural material, but its low room-temperature fracture toughness and low high-temperature strength prevent its practical application. As a possibility to...

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Autores principales: Koji Hagihara, Takaaki Ikenishi, Haruka Araki, Takayoshi Nakano
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Publicado: Nature Portfolio 2017
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Acceso en línea:https://doaj.org/article/a97c8eb7b3274ec7b9dae4cd414381b6
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spelling oai:doaj.org-article:a97c8eb7b3274ec7b9dae4cd414381b62021-12-02T16:06:43ZOutstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure10.1038/s41598-017-04163-02045-2322https://doaj.org/article/a97c8eb7b3274ec7b9dae4cd414381b62017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04163-0https://doaj.org/toc/2045-2322Abstract A (Mo0.85Nb0.15)Si2 crystal with an oriented, lamellar, C40/C11b two-phase microstructure is a promising ultrahigh-temperature (UHT) structural material, but its low room-temperature fracture toughness and low high-temperature strength prevent its practical application. As a possibility to overcome these problems, we first found a development of unique “cross-lamellar microstructure”, by the cooping of Cr and Ir. The cross-lamellar microstructure consists of a rod-like C11b-phase grains that extend along a direction perpendicular to the lamellar interface in addition to the C40/C11b fine lamellae. In this study, the effectiveness of the cross-lamellar microstructure for improving the high-temperature creep deformation property, being the most essential for UHT materials, was examined by using the oriented crystals. The creep rate significantly reduced along a loading orientation parallel to the lamellar interface. Furthermore, the degradation in creep strength for other loading orientation that is not parallel to the lamellar interface, which has been a serious problem up to now, was also suppressed. The results demonstrated that the simultaneous improvement of high-temperature creep strength and room temperature fracture toughness can be first accomplished by the development of unique cross-lamellar microstructure, which opens a potential avenue for the development of novel UHT materials as alternatives to existing Ni-based superalloys.Koji HagiharaTakaaki IkenishiHaruka ArakiTakayoshi NakanoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Koji Hagihara
Takaaki Ikenishi
Haruka Araki
Takayoshi Nakano
Outstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure
description Abstract A (Mo0.85Nb0.15)Si2 crystal with an oriented, lamellar, C40/C11b two-phase microstructure is a promising ultrahigh-temperature (UHT) structural material, but its low room-temperature fracture toughness and low high-temperature strength prevent its practical application. As a possibility to overcome these problems, we first found a development of unique “cross-lamellar microstructure”, by the cooping of Cr and Ir. The cross-lamellar microstructure consists of a rod-like C11b-phase grains that extend along a direction perpendicular to the lamellar interface in addition to the C40/C11b fine lamellae. In this study, the effectiveness of the cross-lamellar microstructure for improving the high-temperature creep deformation property, being the most essential for UHT materials, was examined by using the oriented crystals. The creep rate significantly reduced along a loading orientation parallel to the lamellar interface. Furthermore, the degradation in creep strength for other loading orientation that is not parallel to the lamellar interface, which has been a serious problem up to now, was also suppressed. The results demonstrated that the simultaneous improvement of high-temperature creep strength and room temperature fracture toughness can be first accomplished by the development of unique cross-lamellar microstructure, which opens a potential avenue for the development of novel UHT materials as alternatives to existing Ni-based superalloys.
format article
author Koji Hagihara
Takaaki Ikenishi
Haruka Araki
Takayoshi Nakano
author_facet Koji Hagihara
Takaaki Ikenishi
Haruka Araki
Takayoshi Nakano
author_sort Koji Hagihara
title Outstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure
title_short Outstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure
title_full Outstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure
title_fullStr Outstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure
title_full_unstemmed Outstanding compressive creep strength in Cr/Ir-codoped (Mo0.85Nb0.15)Si2 crystals with the unique cross-lamellar microstructure
title_sort outstanding compressive creep strength in cr/ir-codoped (mo0.85nb0.15)si2 crystals with the unique cross-lamellar microstructure
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/a97c8eb7b3274ec7b9dae4cd414381b6
work_keys_str_mv AT kojihagihara outstandingcompressivecreepstrengthincrircodopedmo085nb015si2crystalswiththeuniquecrosslamellarmicrostructure
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AT harukaaraki outstandingcompressivecreepstrengthincrircodopedmo085nb015si2crystalswiththeuniquecrosslamellarmicrostructure
AT takayoshinakano outstandingcompressivecreepstrengthincrircodopedmo085nb015si2crystalswiththeuniquecrosslamellarmicrostructure
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