熔体处理对A356合金组织和性能的影响

发布时间：2018-01-22 18:48

本文关键词： A 磁悬浮熔炼力学性能显微组织　出处：《铸造》2017年03期 　论文类型：期刊论文

【摘要】：通过光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析仪(EDS)等分析手段,研究了磁悬浮熔炼A356铝合金在输出电流为70 A、加热时间为5 min的条件下,经过不同变质处理后的力学性能及显微组织。结果表明:不同熔体处理的A356的抗拉强度和伸长率,随着烙炼方法和变质剂不断的改进呈上升趋势,其中以磁悬浮熔炼并加入Al-10Sr+Al-5Ti-1B-1RE细化剂的A356合金的抗拉强度和伸长率最高;真空磁悬浮熔炼获得的组织更加致密,Al-5Ti-1B-1RE通过降低自由能、Al-10Sr通过生成高熔点化合物来增加异质形核细化晶粒,两者共同作用达到最佳效果。
[Abstract]:By means of optical microscope, scanning electron microscope (SEM) and energy spectrum analyzer (EDS), the magnetic levitation melting of A356 aluminum alloy was studied. The output current of A356 aluminum alloy was 70 A. The mechanical properties and microstructure of A356 treated by different modification were obtained under the condition of heating time of 5 min. The results showed that the tensile strength and elongation of A356 treated with different melts were different. With the incessant improvement of the cautery method and the modifier, the trend is increasing. The tensile strength and elongation of A356 alloy with magnetic suspension melting and Al-10Sr Al-5Ti-1B-1RE refiner were the highest. The microstructure obtained by vacuum maglev melting is denser than that of Al-5Ti-1B-1RE by reducing the free energy of Al-10Sr by forming high melting point compounds to increase heterogeneous nucleation and grain refinement. The best effect can be achieved by the combined action of the two.
【作者单位】：常州工程职业技术学院机电与汽车工程学院;江苏大学材料科学与工程学院;
【基金】：江苏高校品牌专业建设工程资助项目(PPZY2015C235)
【分类号】：TG292
【正文快照】： 随着节能减排战略的不断推进,铝合金因其密度小,比强度比刚度高,优良的加工成型性等优点,广泛应用于汽车、轨道交通、航空航天航海、民用工业等行业中[1-3]。美国牌号A356系列铝合金是一种应用广泛的亚共晶Al-Si合金,但是在传统熔炼铸造条件下未经处理的A356铝合金易产生气孔

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