$Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment$
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Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment

Nb-Si ultra-high temperature alloys have been a hot topic in aviation materials, but low fracture toughness limits the application. Ultrasound treatment has a significant advantage on the grain refinement and properties improvement, successfully induced into hypoeutectic Nb-Si-Ti ternary alloys to i...

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Autores principales:	Shu Wang, Qi Wang, Ruirun Chen, Yue Chai, Yinling Jin, Yanqing Su
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	NbSi alloy Ultrasonic treatment Acoustic streaming effect Microstructure Fracture toughness Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/3c86c26a3ce4433c9d27b7781701a78b
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spelling	oai:doaj.org-article:3c86c26a3ce4433c9d27b7781701a78b2021-11-26T04:23:56ZImproving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment0264-127510.1016/j.matdes.2021.110262https://doaj.org/article/3c86c26a3ce4433c9d27b7781701a78b2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0264127521008170https://doaj.org/toc/0264-1275Nb-Si ultra-high temperature alloys have been a hot topic in aviation materials, but low fracture toughness limits the application. Ultrasound treatment has a significant advantage on the grain refinement and properties improvement, successfully induced into hypoeutectic Nb-Si-Ti ternary alloys to improve primary morphology and fracture toughness. In this work, Nb-16Si-22Ti alloy was treated by ultrasound of 0 s, 80 s, 120 s, 160 s and 200 s. Meanwhile, the coupled physical fields were simulated in Comsol Multiphysics to reveal the mechanism of ultrasonic action. Results show that γ-Nb5Si3 appears with ultrasound induced, and the solidification path is close to the equilibrium transition. Primary Nbss phases were coarsened and spheroidized after ultrasound treatment, and fracture toughness improved by 69.16%. Simulation results show that the strong acoustic active zone is at the height of 15 mm in the ingot, with maximum sound pressure of 36.3 MPa. The high sound pressure can break dendrites. Maximum fluid velocity reaches 0.03 m/s in the longitudinal section and 0.02 m/s in the transversal section with several circulations. Acoustic streaming and cavitation effects break dendrites and spheroidize Nbss phase, benefit to elements distribution uniformly, equilibrium transition and fracture toughness improvement.Shu WangQi WangRuirun ChenYue ChaiYinling JinYanqing SuElsevierarticleNbSi alloyUltrasonic treatmentAcoustic streaming effectMicrostructureFracture toughnessMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials & Design, Vol 212, Iss , Pp 110262- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	NbSi alloy Ultrasonic treatment Acoustic streaming effect Microstructure Fracture toughness Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	NbSi alloy Ultrasonic treatment Acoustic streaming effect Microstructure Fracture toughness Materials of engineering and construction. Mechanics of materials TA401-492 Shu Wang Qi Wang Ruirun Chen Yue Chai Yinling Jin Yanqing Su Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment
description	Nb-Si ultra-high temperature alloys have been a hot topic in aviation materials, but low fracture toughness limits the application. Ultrasound treatment has a significant advantage on the grain refinement and properties improvement, successfully induced into hypoeutectic Nb-Si-Ti ternary alloys to improve primary morphology and fracture toughness. In this work, Nb-16Si-22Ti alloy was treated by ultrasound of 0 s, 80 s, 120 s, 160 s and 200 s. Meanwhile, the coupled physical fields were simulated in Comsol Multiphysics to reveal the mechanism of ultrasonic action. Results show that γ-Nb5Si3 appears with ultrasound induced, and the solidification path is close to the equilibrium transition. Primary Nbss phases were coarsened and spheroidized after ultrasound treatment, and fracture toughness improved by 69.16%. Simulation results show that the strong acoustic active zone is at the height of 15 mm in the ingot, with maximum sound pressure of 36.3 MPa. The high sound pressure can break dendrites. Maximum fluid velocity reaches 0.03 m/s in the longitudinal section and 0.02 m/s in the transversal section with several circulations. Acoustic streaming and cavitation effects break dendrites and spheroidize Nbss phase, benefit to elements distribution uniformly, equilibrium transition and fracture toughness improvement.
format	article
author	Shu Wang Qi Wang Ruirun Chen Yue Chai Yinling Jin Yanqing Su
author_facet	Shu Wang Qi Wang Ruirun Chen Yue Chai Yinling Jin Yanqing Su
author_sort	Shu Wang
title	Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment
title_short	Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment
title_full	Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment
title_fullStr	Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment
title_full_unstemmed	Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment
title_sort	improving primary nbss morphology and fracture toughness in hypoeutectic nb-si-ti ternary alloy by ultrasonic treatment
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/3c86c26a3ce4433c9d27b7781701a78b
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Improving primary Nbss morphology and fracture toughness in hypoeutectic Nb-Si-Ti ternary alloy by ultrasonic treatment

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