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Formation of Second-Phases in a Direct-Chill Casting Al-12Si-0.65Mg-xMn Alloy
Wang Guangdong1; Tian Ni1,2; He Changshu1,2; Zhao Gang1,2; Zuo Liang2,3
Corresponding AuthorTian Ni(tiann@atm.neu.edu.cn)
2018-07-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume54Issue:7Pages:1059-1067
AbstractMg-containing high Si aluminum alloy that can be heat treatment enhanced is widely used in the fields of engine, vehicle industry and aerospace, because of its high specific strength, high wear resistance, corrosion resistance and low thermal expansion coefficient. At present, the alloying to improve the microstructure of Mg-containing high Si aluminum alloy and improve its mechanical properties is an important research hotspot of this kind of alloy. As an important alloying element in aluminum alloy, Manganese is of great significance to study the type and formation process of Mn-containing second phase in Mg-containing high Si aluminum alloy. The second phases and their formation in a direct-chill casting Al-12Si-0.65Mg-(0 similar to 2.27)Mn (mass fraction, %) alloy were investigated by LSCM, XRD, SEM/EDS and TEM/EDS, combined with phase graph analysis. The results show that there are eutectic silicon, Mg2Si and E(Al8Mg3FeSi8) besides matrix alpha-Al in the Mn-free Al-125i-0.65Mg (mass fraction, %) alloy ingot, which are formed by the reactions of L+Al5FeSi ->alpha-Al+Si+Al8Mg3FeSi8, L ->alpha-Al+Si+Mg2Si and L ->alpha-Al+Si+Mg2Si+Al8Mg3FeSi8 at 567, 555 and 550 similar to 554 degrees C, respectively. The alpha-Al dendrites are obviously refined, and alpha-Al(FeMn)Si phase can be observed with the addition of Mn to Al-12Si-0.65Mg-(0.10 similar to 2.27)Mn (mass fraction, %) alloy ingot. With the Mn content increasing from 0.10% to 2.27%, the morphology of alpha-Al dendrites has no obvious change, and the number of alpha-Al(FeMn)Si increases gradually whereas the size of alpha-Al(FeMn)Si doesn't change much. There are some Al-9(FeMn)(4)Si-3 with the size of about 80 mu m in the Al-12Si- 0.65Mg-(1.07 similar to 2.27)Mn (mass fraction, %) alloy ingot with the Mn content over 1.07%, which are formed by the reaction of L+Al8Mn ->alpha-Al+Al-9(FeMn)(4)Si-3 at 647 degrees C, and Al9Mn4Si3 turns into Al-9(FeMn)(4)Si-3 with Fe dissolved into it. The number of Al-9(FeMn)(4)Si-3 increases with the Mn content increasing from 1.07% to 2.27%, whereas the size of Al-9(FeMn)(4)Si-3 has no obvious change. Mg2Si entirely dissolves into the matrix. Eutectic silicon, pi-(Al8Mg3FeSi8) and alpha-Al(FeMn)Si spheroidize into granules, whereas the size, the morphology and the number of Al-9(FeMn)(4)Si-3 remain unchanged after the Al-12Si-0.65Mg-xMn (mass fraction, %) alloy ingots were homogenized at 550 degrees C . Simultaneously, there are many Al-9(FeMn)(4)Si-3 at hundreds of nanometer size precipitated out from the Al-12Si-0.65Mg-(0.10 similar to 2.27)Mn (mass fraction, %) alloy matrix after homogenization treatment, and the number of them increases with the increasing of Mn content.
KeywordMg-containing eutectic Al-Si alloy Mn second-phase direct-chill casting homogenization
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China
DOI10.11900/0412.1961.2017.00475
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51371045] ; National Key Research and Development Program of China[2016YFB0300801] ; National Key Research and Development Program of China[2016YFB1200506-12]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000435961500011
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128647
Collection中国科学院金属研究所
Corresponding AuthorTian Ni
Affiliation1.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Liaoning, Peoples R China
2.Northeastern Univ, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Wang Guangdong,Tian Ni,He Changshu,et al. Formation of Second-Phases in a Direct-Chill Casting Al-12Si-0.65Mg-xMn Alloy[J]. ACTA METALLURGICA SINICA,2018,54(7):1059-1067.
APA Wang Guangdong,Tian Ni,He Changshu,Zhao Gang,&Zuo Liang.(2018).Formation of Second-Phases in a Direct-Chill Casting Al-12Si-0.65Mg-xMn Alloy.ACTA METALLURGICA SINICA,54(7),1059-1067.
MLA Wang Guangdong,et al."Formation of Second-Phases in a Direct-Chill Casting Al-12Si-0.65Mg-xMn Alloy".ACTA METALLURGICA SINICA 54.7(2018):1059-1067.
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