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Microstructure evolution during the liquid-liquid phase transformation of Al-Bi alloys under the effect of TiC particles
Sun, Qian; Jiang, Hongxiang; Zhao, Jiuzhou; He, Jie; Zhao, JZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2017-05-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume129Pages:321-330
AbstractSolidification experiments were carried out for Al-Bi alloys with the addition of TiC. It is demonstrated that the average size of the Bi-rich minority phase particles (MPPs) shows a tendency of keeping constant, increasing, decreasing and then keeping constant again with the increase of the additive amount of TiC. The MPPs can be refined effectively with the addition of an appropriate amount of TIC. A model was developed to describe the kinetic behavior of the TiC particles in the melt and the microstructure evolution during the liquid-liquid (L-L) phase transformation of the Al-Bi alloys with the addition of TiC. The numerical results show that TiC particles may dissolve and coarsen during the heating period, and precipitate out during the cooling period of the melt. There may be two kinds of TiC particles: the one remained during holding temperature and the one precipitated during a cooling of the melt. Both of them can work as the inoculants for the nucleation of the minority phase droplets. What determines the refining efficiency is the resultant number density of the TiC particles in the melt cooled to the binodal line temperature. This research demonstrates that inoculation is an effective method for controlling the L-L phase transformation. The addition of the efficient inoculant may promote the formation of a monotectic alloy with a well dispersed microstructure. (C) 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc.; Solidification experiments were carried out for Al-Bi alloys with the addition of TiC. It is demonstrated that the average size of the Bi-rich minority phase particles (MPPs) shows a tendency of keeping constant, increasing, decreasing and then keeping constant again with the increase of the additive amount of TiC. The MPPs can be refined effectively with the addition of an appropriate amount of TIC. A model was developed to describe the kinetic behavior of the TiC particles in the melt and the microstructure evolution during the liquid-liquid (L-L) phase transformation of the Al-Bi alloys with the addition of TiC. The numerical results show that TiC particles may dissolve and coarsen during the heating period, and precipitate out during the cooling period of the melt. There may be two kinds of TiC particles: the one remained during holding temperature and the one precipitated during a cooling of the melt. Both of them can work as the inoculants for the nucleation of the minority phase droplets. What determines the refining efficiency is the resultant number density of the TiC particles in the melt cooled to the binodal line temperature. This research demonstrates that inoculation is an effective method for controlling the L-L phase transformation. The addition of the efficient inoculant may promote the formation of a monotectic alloy with a well dispersed microstructure. (C) 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
description.department[sun, qian ; jiang, hongxiang ; zhao, jiuzhou ; he, jie] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [sun, qian] univ sci & technol china, sch mat sci & engn, shenyang 110016, peoples r china
KeywordHeterogeneous Nucleation Of Phase Precipitation Phase Transformation Modelling Microstructure
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51471173, 51501207, 51374194, 51271185]; China Manned Space Engineering [TGJZ800-2-RW024]; Natural Science Foundation of Liaoning Province [201501043]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78167
Collection中国科学院金属研究所
Corresponding AuthorZhao, JZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Sun, Qian,Jiang, Hongxiang,Zhao, Jiuzhou,et al. Microstructure evolution during the liquid-liquid phase transformation of Al-Bi alloys under the effect of TiC particles[J]. ACTA MATERIALIA,2017,129:321-330.
APA Sun, Qian,Jiang, Hongxiang,Zhao, Jiuzhou,He, Jie,&Zhao, JZ .(2017).Microstructure evolution during the liquid-liquid phase transformation of Al-Bi alloys under the effect of TiC particles.ACTA MATERIALIA,129,321-330.
MLA Sun, Qian,et al."Microstructure evolution during the liquid-liquid phase transformation of Al-Bi alloys under the effect of TiC particles".ACTA MATERIALIA 129(2017):321-330.
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