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Effect of Microstructure Transformation on Mechanical Properties and Conductive Properties of Al-20%(Al-5Ti-1B) Alloy

WAN Qian;BIAN Liping;ZHOU Guohua;ZHAO Yuanliang;ZHAO Xingguo;LIANG Wei;College of Materials Science and Engineering,Taiyuan University of Technology;Shanxi Key Laboratory of Advanced Magnesium-based Materials;Datong Power Supply Company,State Grid Shanxi Electric Power Company;  
The Al-20%(Al-5Ti-1B) alloy was prepared by adding 20% Al-5Ti-1B into pure aluminum. After solution at 550 ℃ for 12 h, one pass equal angular extrusion test at room temperature was carried out. The microstructure of the alloy was studied by means of metallographic microscope and scanning electron microscope. The electrical conductivity and hardness of the alloy in different states were measured. The tensile tests of as-cast and extruded alloys at room temperature were carried out. The effect of microstructure transformation on the mechanical and electrical properties of the alloy was studied. The results show that the equal-channel angular extrusion can refine the grain, improve the uniformity of the distribution of the second phase particles, and improve the mechanical and electrical properties of Al-20%(Al-5Ti-1B) alloy.Comparing with the as-cast alloy, the yield strength of the alloy increases from 195 MPa to 245 MPa, which increases by13.4%, the hardness increases from 26.37 HV to 44 HV, which increases by 66.85%, the conductivity increases from 49.63% IACS to 51.8% IACS, which increases by 4.4%.
【Fund】: 国家自然科学基金资助项目(51401143);; 山西省青年科技研究基金资助项目(2014021017-1)
【CateGory Index】: TG379
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