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Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites

The high-temperature mechanical properties of directionally solidified (DS) ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites with a script lamellar structure have been investigated as a function of loading axis orientation and growth rate in a temperature range from 900 to 15...

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Autores principales: Matsunoshita, Hirotaka, Sasai, Yuta, Fujiwara, Kosuke, Kishida, Kyosuke, Inui, Haruyuki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5118655/
https://www.ncbi.nlm.nih.gov/pubmed/27877900
http://dx.doi.org/10.1080/14686996.2016.1218248
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author Matsunoshita, Hirotaka
Sasai, Yuta
Fujiwara, Kosuke
Kishida, Kyosuke
Inui, Haruyuki
author_facet Matsunoshita, Hirotaka
Sasai, Yuta
Fujiwara, Kosuke
Kishida, Kyosuke
Inui, Haruyuki
author_sort Matsunoshita, Hirotaka
collection PubMed
description The high-temperature mechanical properties of directionally solidified (DS) ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites with a script lamellar structure have been investigated as a function of loading axis orientation and growth rate in a temperature range from 900 to 1500°C. These DS ingots are plastically deformed above 1000 and 1100 °C when the compression axis orientations are parallel to [1[Image: see text] 0](MoSi2) (nearly parallel to the growth direction) and [001](MoSi2), respectively. [1[Image: see text] 0](MoSi2)-oriented DS eutectic composites are strengthened so much by forming a script lamellar microstructure and they exhibit yield stress values several times higher than those of MoSi(2) single crystals of the corresponding orientation. The yield stress values increase with the decrease in the average thickness of MoSi(2) phase in the script lamellar structure, indicating that microstructure refinement is effective in obtaining better high-temperature strength of these DS eutectic composites. Among the four ternary alloying elements tested (V, Nb, Ta and W), Ta is found to be the most effective in obtaining higher yield strength at 1400 °C.
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spelling pubmed-51186552016-11-22 Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites Matsunoshita, Hirotaka Sasai, Yuta Fujiwara, Kosuke Kishida, Kyosuke Inui, Haruyuki Sci Technol Adv Mater Engineering and Structural materials The high-temperature mechanical properties of directionally solidified (DS) ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites with a script lamellar structure have been investigated as a function of loading axis orientation and growth rate in a temperature range from 900 to 1500°C. These DS ingots are plastically deformed above 1000 and 1100 °C when the compression axis orientations are parallel to [1[Image: see text] 0](MoSi2) (nearly parallel to the growth direction) and [001](MoSi2), respectively. [1[Image: see text] 0](MoSi2)-oriented DS eutectic composites are strengthened so much by forming a script lamellar microstructure and they exhibit yield stress values several times higher than those of MoSi(2) single crystals of the corresponding orientation. The yield stress values increase with the decrease in the average thickness of MoSi(2) phase in the script lamellar structure, indicating that microstructure refinement is effective in obtaining better high-temperature strength of these DS eutectic composites. Among the four ternary alloying elements tested (V, Nb, Ta and W), Ta is found to be the most effective in obtaining higher yield strength at 1400 °C. Taylor & Francis 2016-09-08 /pmc/articles/PMC5118655/ /pubmed/27877900 http://dx.doi.org/10.1080/14686996.2016.1218248 Text en © 2016 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Engineering and Structural materials
Matsunoshita, Hirotaka
Sasai, Yuta
Fujiwara, Kosuke
Kishida, Kyosuke
Inui, Haruyuki
Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites
title Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites
title_full Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites
title_fullStr Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites
title_full_unstemmed Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites
title_short Plastic deformation of directionally solidified ingots of binary and some ternary MoSi(2)/Mo(5)Si(3) eutectic composites
title_sort plastic deformation of directionally solidified ingots of binary and some ternary mosi(2)/mo(5)si(3) eutectic composites
topic Engineering and Structural materials
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5118655/
https://www.ncbi.nlm.nih.gov/pubmed/27877900
http://dx.doi.org/10.1080/14686996.2016.1218248
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