Effect of Co Element on Microstructure and Mechanical Properties of Al-10Si-1.5Fe Alloy
HUANG Huiyi1,2, LIU Yiyuan1, TANG Peng1,3, HU Zhiliu1, WANG Kang4, HAN Zhenyao1
1 School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China; 2 Alnan Aluminium Co., Ltd., Nanning 530200, China; 3 Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Nanning 530004, China; 4 School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523000, China
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.
黄惠毅, 刘裔源, 唐鹏, 胡治流, 王康, 韩振尧. Co元素对Al-10Si-1.5Fe合金显微组织和力学性能的影响[J]. 材料导报, 2020, 34(16): 16087-16093.
HUANG Huiyi, LIU Yiyuan, TANG Peng, HU Zhiliu, WANG Kang, HAN Zhenyao. Effect of Co Element on Microstructure and Mechanical Properties of Al-10Si-1.5Fe Alloy. Materials Reports, 2020, 34(16): 16087-16093.
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2020, Vol. 34 
