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EFFECT OF MICRO-ALLOYING ELEMENT Bi ON SOLIDIFICATION AND MICROSTRUCTURE OF Al-Pb ALLOY
Sun Qian1,2; Jiang Hongxiang1,2; Zhao Jiuzhou1,2
Corresponding AuthorZhao Jiuzhou(jzzhao@imr.ac.cn)
2016-04-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:4Pages:497-504
AbstractMonotectic alloys are characterized by a miscibility gap in the liquid state. Many of them have great potentials to be used in industry. For example, alloys based on Cu-Pb and Al-Pb are good candidates to be used as advanced bearing materials if the soft Pb phase is dispersed in the Al or Cu matrix. Cu-Cr alloy is a high strength, high conductivity material and Cu-Co alloy is an excellent magneto-resistive material, etc.. However, when a homogeneous monotectic alloy melt is cooled into the miscibility gap, it will transform into two liquids. The liquid-liquid decomposition generally causes the formation of a phase segregated microstructure. In recent years, considerable efforts have been made to investigate the solidification behavior of monotectic alloys. A lot of experiments have been carried out under microgravity conditions in space as well as under the gravitational conditions on the earth. The solidification behaviors of monotectic alloys under the conventional and rapid solidification conditions as well as the effect of external fields, such as electric current, magnetic field etc., are investigated. Models describing the solidification process have been built and the microstructure formations under different conditions have been calculated. It has been demonstrated that the microstructure evolution during cooling an alloy in the miscibility gap is a result of the concurrent actions of the nucleation, growth, Ostwald ripening and motions of the dispersed phase droplets. The nucleation of the dispersed phase droplets has a dominant influence on the solidification microstructure of monotectic alloys. In this work, solidification experiments were carried out to investigate the effect of micro-alloying element Bi on the solidification of Al-Pb alloys. The experimental results demonstrate that micro-alloying element Bi can cause an obvious refinement of the Pb-rich particles. The refining effect increases with the increase of the Pb content of Al-Pb alloys. The affecting mechanism of micro-alloying element Bi on the solidification process of Al-Pb alloys was analyzed. The microstructure formation process was calculated. The numerical results indicate that the addition of micro-alloying element Bi causes a reduction in the interfacial energy between the two liquid phases and, thus, enhances the nucleation rate of the Pb-rich droplets and promotes the formation of Al-Pb alloys with a well-dispersed microstructure.
Keywordmicro-alloying element monotectic alloy interfacial energy solidification microstructure
Funding OrganizationNational Natural Science Foundation of China ; China Manned Space Engineering
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51271185] ; National Natural Science Foundation of China[51471173] ; China Manned Space Engineering[TGJZ800-2-RW024]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000374809600014
PublisherSCIENCE PRESS
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/122081
Collection中国科学院金属研究所
Corresponding AuthorZhao Jiuzhou
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Sun Qian,Jiang Hongxiang,Zhao Jiuzhou. EFFECT OF MICRO-ALLOYING ELEMENT Bi ON SOLIDIFICATION AND MICROSTRUCTURE OF Al-Pb ALLOY[J]. ACTA METALLURGICA SINICA,2016,52(4):497-504.
APA Sun Qian,Jiang Hongxiang,&Zhao Jiuzhou.(2016).EFFECT OF MICRO-ALLOYING ELEMENT Bi ON SOLIDIFICATION AND MICROSTRUCTURE OF Al-Pb ALLOY.ACTA METALLURGICA SINICA,52(4),497-504.
MLA Sun Qian,et al."EFFECT OF MICRO-ALLOYING ELEMENT Bi ON SOLIDIFICATION AND MICROSTRUCTURE OF Al-Pb ALLOY".ACTA METALLURGICA SINICA 52.4(2016):497-504.
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