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Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn
Li Wang1,2; Sun Qian1,2; Jiang Hongxiang1; Zhao Jiuzhou1,2
Corresponding AuthorZhao Jiuzhou(jzzhao@imr.ac.cn)
2019-07-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:7Pages:831-839
AbstractAl-Bi alloy has a low friction coefficient and high wear-resistant properties and is a good self-lubricating material for advanced bearings in automotive applications if the soft Bi-rich phase is dispersedly distributed in the comparatively harder Al-based matrix. However, Al-Bi alloy is a typical immiscible alloy. When cooling a homogeneous single phase liquid of Al-Bi alloy in the miscibility gap, it transforms into two liquids. The liquid-liquid phase transformation generally leads to the formation of a phase segregated microstructure. In the last decades, considerable efforts have been made to study the solidification behavior of Al-Bi alloy. It is demonstrated that the microstructure evolution during the liquid-liquid decomposition is a result of concurrent actions of the nucleation, growth, Ostwald ripening and motions of the Bi-rich droplets. The nucleation and the immigration of the Bi-rich droplets show a dominant influence on the solidification microstructure of Al-Bi alloy. Enhancing the nucleation rate and reducing the Marangoni migration velocity of the Bi-rich droplets promote the formation of a well dispersed microstructure. Considering that addition of surface active element to the alloy may result in a reduction in the liquid-liquid interface energy, and thus reduce the nucleation energy barrier and Marangoni migration velocity of the Bi-rich droplets, the possibility to control the solidification process and microstructure of Al-Bi alloys by adding micro-alloying element Sn was investigated. The experimental results show that microalloying element Sn can cause an effective refinement of the Bi-rich particles. The refining effect increases with the increase of Bi content up to 0.10%Sn (mass fraciton). A model was developed to calculate the microstructure formation. The numerical results demonstrate that Sn can act as an effective surface active element for Al-Bi alloys and promote the formation of a well dispersed microstructure.
KeywordAl-Bi alloy solidification microalloying interfacial energy simulation
Funding OrganizationNational Natural Science Foundation of China ; China Manned Space Engineering Project
DOI10.11900/0412.1961.2018.00450
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51471173] ; National Natural Science Foundation of China[51771210] ; National Natural Science Foundation of China[51501207] ; China Manned Space Engineering Project[TGJZ800-2-RW024]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000471268000003
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/134215
Collection中国科学院金属研究所
Corresponding AuthorZhao Jiuzhou
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Li Wang,Sun Qian,Jiang Hongxiang,et al. Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn[J]. ACTA METALLURGICA SINICA,2019,55(7):831-839.
APA Li Wang,Sun Qian,Jiang Hongxiang,&Zhao Jiuzhou.(2019).Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn.ACTA METALLURGICA SINICA,55(7),831-839.
MLA Li Wang,et al."Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn".ACTA METALLURGICA SINICA 55.7(2019):831-839.
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