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Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl

To modify the microstructure and enhance performances, the ultrasonic vibration is applied in the mould casting of TiAl alloy. The effects and mechanism of ultrasonic vibration on the solidifying microstructure and mechanical properties are investigated and the model for predicting lamellar colony s...

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Autores principales: Ruirun, Chen, Deshuang, Zheng, Tengfei, Ma, Hongsheng, Ding, Yanqing, Su, Jingjie, Guo, Hengzhi, Fu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5259764/
https://www.ncbi.nlm.nih.gov/pubmed/28117451
http://dx.doi.org/10.1038/srep41463
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author Ruirun, Chen
Deshuang, Zheng
Tengfei, Ma
Hongsheng, Ding
Yanqing, Su
Jingjie, Guo
Hengzhi, Fu
author_facet Ruirun, Chen
Deshuang, Zheng
Tengfei, Ma
Hongsheng, Ding
Yanqing, Su
Jingjie, Guo
Hengzhi, Fu
author_sort Ruirun, Chen
collection PubMed
description To modify the microstructure and enhance performances, the ultrasonic vibration is applied in the mould casting of TiAl alloy. The effects and mechanism of ultrasonic vibration on the solidifying microstructure and mechanical properties are investigated and the model for predicting lamellar colony size is established. After ultrasonic vibration, the coarse microstructure is well modified and lamellar colony is refined from 534 μm to 56 μm. Most of precipitated phases are dissolved into the lamellar colony leading to a homogenous element distribution. The phase ratio of α(2)-Ti(3)Al and γ-TiAl is increased, and the chemical composition is promoted to more close to equilibrium level by weakening the influence of β-alloying elements. The microhardness and yield strength are gradually improved by 23.72% and 181.88% due to the fine grain strengthening, while the compressive strength is enhanced by 24.47% through solution strengthening. The critical ultrasonic intensity (I(b)) for TiAl alloy is estimated at 220 W cm(−2) and the model for average lamellar colony size is established as [Image: see text]. The ultrasonic refinement efficiency exponentially increases as the ultrasonic vibration time with a theoretic limit maximum value of E(lim) = 88% and the dominating refinement mechanism by ultrasonic vibration is the cavitation-enhanced nucleation rather than cavitation-induced dendrite fragmentation.
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spelling pubmed-52597642017-01-25 Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl Ruirun, Chen Deshuang, Zheng Tengfei, Ma Hongsheng, Ding Yanqing, Su Jingjie, Guo Hengzhi, Fu Sci Rep Article To modify the microstructure and enhance performances, the ultrasonic vibration is applied in the mould casting of TiAl alloy. The effects and mechanism of ultrasonic vibration on the solidifying microstructure and mechanical properties are investigated and the model for predicting lamellar colony size is established. After ultrasonic vibration, the coarse microstructure is well modified and lamellar colony is refined from 534 μm to 56 μm. Most of precipitated phases are dissolved into the lamellar colony leading to a homogenous element distribution. The phase ratio of α(2)-Ti(3)Al and γ-TiAl is increased, and the chemical composition is promoted to more close to equilibrium level by weakening the influence of β-alloying elements. The microhardness and yield strength are gradually improved by 23.72% and 181.88% due to the fine grain strengthening, while the compressive strength is enhanced by 24.47% through solution strengthening. The critical ultrasonic intensity (I(b)) for TiAl alloy is estimated at 220 W cm(−2) and the model for average lamellar colony size is established as [Image: see text]. The ultrasonic refinement efficiency exponentially increases as the ultrasonic vibration time with a theoretic limit maximum value of E(lim) = 88% and the dominating refinement mechanism by ultrasonic vibration is the cavitation-enhanced nucleation rather than cavitation-induced dendrite fragmentation. Nature Publishing Group 2017-01-24 /pmc/articles/PMC5259764/ /pubmed/28117451 http://dx.doi.org/10.1038/srep41463 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Ruirun, Chen
Deshuang, Zheng
Tengfei, Ma
Hongsheng, Ding
Yanqing, Su
Jingjie, Guo
Hengzhi, Fu
Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl
title Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl
title_full Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl
title_fullStr Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl
title_full_unstemmed Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl
title_short Effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying TiAl
title_sort effects of ultrasonic vibration on the microstructure and mechanical properties of high alloying tial
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5259764/
https://www.ncbi.nlm.nih.gov/pubmed/28117451
http://dx.doi.org/10.1038/srep41463
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