摘要
采用纯铝中加20%的Al-5Ti-1B制备了Al-20%(Al-5Ti-1B)合金,并在550℃固溶12h后进行1道次室温等径角挤压试验。运用金相显微镜和扫描电镜等研究了合金微观结构的变化,测定了合金不同状态下的导电率和硬度。对铸态和挤压态合金进行了室温拉伸试验。研究了组织转变对合金力学性能与导电性能的影响。结果表明,等径角挤压可以细化晶粒,改善第二相颗粒分布的均匀性,提高Al-20%(Al-5Ti-1B)合金的力学性能和导电性能。与铸态合金相比,等径角挤压后的合金屈服强度由195 MPa增加到245 MPa,提高了13.4%;硬度由26.37 HV增大到44 HV,提高了66.85%;导电率由49.63%IACS增加到51.8%IACS,提高4.4%。
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 by 13.4%, 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%.
作者
万骞
边丽萍
周国华
赵元亮
赵兴国
梁伟
WAN Qian;BIAN Liping;ZHOU Guohua;ZHAO Yuanliang;ZHAO Xingguo;LIANG Wei(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Key Laboratory of Advanced Magnesium-based Materials,Taiyuan 030024,China;Datong Power Supply Company,State Grid Shanxi Electric Power Company,Datong 030008,China)
出处
《热加工工艺》
北大核心
2019年第17期38-41,45,共5页
Hot Working Technology
基金
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)
关键词
组织转变
等径角挤压(ECAP)
Al-5Ti-1B合金
力学性能
导电性能
microstructure transformation
equal-channel angular pressing (ECAP)
Al-5Ti-1B alloy
mechanical properties
electrical conductivity
