Co元素对Al-10Si-1.5Fe合金显微组织和力学性能的影响

doi:10.11896/cldb.19060020

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Abstract In this paper, the effect of Co on iron-rich phase in Al-10Si-1.5Fe alloy was studied by adding different content of Co. The results show that Co can effectively modify acicular iron-rich phase structure. With the increase of Co content, acicular β-phase gradually transforms into a small block of α-Al₁₅ (Fe, Co)₃Si₂ phase structure. When the Co/Fe ratio is 1.5, the acicular Fe phase disappears, the average length of Fe phase reaches the minimum of 15.4 μm, and the refinement effect is the best. At the same time, the tensile strength of the alloy reaches the maximum value of 152.7 MPa, and the maximum elongation after fracture is 1.58%, which is 66.8% and 61.2% higher than that of the original alloy without Co addition, respectively. With the excessive addition of cobalt, the agglomeration of small bulk rich (Fe, Co) intermetallic compounds occurs, and the precipitation of white filamentary Co-rich phase (Al₃Co) leads to the decrease of alloy properties. It can be seen that the addition of Co element in the matrix will react with the Fe element in the Fe compounds to variety intermetallic compounds. At the same time, different Co content will also affect the morphology of the intermetallic compounds.

Key words： Co element Al-10Si-1.5Fe iron-rich phase microstructure mechanical properties

Published: 24 July 2020

CLC number:

TG146.2

Fund:This work was financially supported by the Guangxi Natural Science Foundation (2017GXNSFAA19827), the Project of Guangxi Association for Science and Technology (2019ZB-11), the PhD Initiate Foundation of Guangxi University (XBZ190876), Center of Ecological Collaborative Innovation for Aluminum Industry in Guangxi (20190225), the Project of Guangxi Educational Committee (2018KY0034), and the Guangxi Innovation Driving Foundation (AA17202011-1).

About author:: Huiyi Huanggraduated from Guangxi University in June 2019 with a master’s degree in engineering. He studied at the School of Resources, Environment and Materials of Guangxi University (GXU) from September 2016 to June 2019. He is currently working at the Materials Application Research Institute of Guangxi Nannan Aluminum Co., Ltd., mainly engaged in the research and control of aluminum alloy structure and its mechanism.
Yiyuan Liugraduated from Guangxi University in June 2018 with a bachelor’s degree in engineering. He stu-died at the School of Resources, Environment and Materials of Guangxi University from 2014 to September to June 2018. He is currently pursuing a master’s degree in engineering from the School of Environment and Materials of Guangxi University.
Peng Tangreceived his Ph.D. degree in material processing engineering (SCUT) in 2017. He is currently an tutor in Guangxi University (GXU) and participates in the development of purification aluminum melt and strengthening and toughening of aluminum alloys. His research interests are preparation of characterization and application new alloy system.

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Cite this article:

HUANG Huiyi,LIU Yiyuan,TANG Peng, et al. Effect of Co Element on Microstructure and Mechanical Properties of Al-10Si-1.5Fe Alloy[J]. Materials Reports, 2020, 34(16): 16087-16093.

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http://www.mater-rep.com/EN/10.11896/cldb.19060020 OR http://www.mater-rep.com/EN/Y2020/V34/I16/16087

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