稀土元素Eu和冷却速率对Al-7Si合金中共晶硅的影响

doi:10.11896/cldb.20020065

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Abstract In view of the good modification effect of rare earth element Eu on eutectic silicon, this paper investigates the effects of different Eu content (0.04%, 0.1%, 0.16%, 0.22%, wt%), cooling rate, modification temperature, holding time and remelting times on the modification effect of Al-7Si eutectic silicon. The results show that the increase of cooling rate is beneficial to the modification of Eu element. The higher cooling rate is, the lower the Eu content is required for the complete transformation of eutectic silicon from needle to fibrous. The modification temperature and holding time will affect the modification effect of Eu element. The best modification temperature is 750 ℃, and the best holding time is 15 min. the increase of remelting times will lead to the failure of modification, The remelting times should not exceed three times without affecting the modification effect of rare earth Eu.

Key words： Al-Si alloy cooling rate rare earth element eutectic silicon

Published: 10 May 2021

CLC number:

TG146

Fund:Key Scientific and Technological Project of Henan Province (192102210009), the Opening Project of Jiangsu Pro-vince Key Laboratory of High-end Structural Materials (hsm103), National Joint Engineering Research Center for Abrasion Control and Molding of Metal Mate-rials (HKDNM201815).

About author:: Liming Ou received his bachelor degree in June 2018 from Henan University of Science and Technology in engineering. From September 2018 to now, he is studying for a master's degree at the School of Mechanical Engineering in Yangtze University.
Feng Mao, He graduated from Dalian University of Technology as a doctoral student, lecturer of Henan University of science and technology. His research interests of alloy modification and refinement, real-time synchrotron radiation imaging of solidification process of metal matrix composite, and synchrotron radiation CT imaging of microstructure of metal matrix composite. He has a hand in 3 general projects of NSFC. He has published more than 10 papers in Journals of Alloys and Compounds, Materials Characterization and other domestic and foreign journals, including 12 SCI papers.
Shizhong Wei, He graduated from Xi'an Jiaotong University as a doctoral student, professor (Level 2), doctoral supervisor, vice president of Henan University of Science and Technology, member of the 13th CPPCC National Committee. Special allowance expert of the State Council, national candidate of “one million talents project”, young and middle-aged experts with outstan-ding national contributions, innovation team leader of “Yangtze River Scholars and Innovation Team Development Plan”, rolling support from the Ministry of education, winner of China industry university research cooperation innovation award, visiting scholar of the University of Michigan in the United States, chief of the first batch of Central Plains scholars and scientists' studios in Henan Province Scientist, Henan Province “Central Plains scholar”, Hubei Province “Chutian scho-lar”, Henan Province outstanding professional and technical talents, Henan Province outstanding experts, Henan province innovation first medal winner, Henan University Distinguished Professor, Henan Province Science and technology innovation team leader, Henan Province Science and technology innovation outstanding talents, Henan top ten science and technology innovation figures, Henan Province independent innovation Top Ten Outstanding Youth. Director of national and local joint Engineering Research Center for wear control and forming technology of metal materials, director of Engineering Research Center of Ministry of tribology and material protection education, etc.

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Cite this article:

OU Liming,MAO Feng,QIAO Yongfeng, et al. Effect of Rare Earth Element Eu and Cooling Rate on Eutectic Silicon in Al-7Si Alloy[J]. Materials Reports, 2021, 35(8): 8103-8107.

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http://www.mater-rep.com/EN/10.11896/cldb.20020065 OR http://www.mater-rep.com/EN/Y2021/V35/I8/8103

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