固液比与Al-Ti-B添加量对8011铝合金组织和性能的影响  

Effect of Al-Ti-B Addition Amount on Micro-structure and Properties of 8011 Aluminum Alloy at Different Solid-liquid Ratios

作　　者：魏振鹏 雷东锴 周耀邦 刘建兴 丁万武[2] WEI Zhenpeng;LEI Dongkai;ZHOU Yaobang;LIU Jianxing;DING Wanwu(Jiuquan Group Dongxing Aluminum Co.,Ltd.,Jiayuguan 735100,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]酒泉钢铁集团东兴铝业有限公司,甘肃嘉峪关735100 [2]兰州理工大学材料科学与工程学院,兰州730050

出　　处：《有色金属工程》2023年第6期46-52,共7页Nonferrous Metals Engineering

基　　金：甘肃省重点研发计划项目(21YF5GD183);甘肃省教育厅产业支撑计划项目(2021CYZC-23);嘉峪关科技计划项目(21-10)。

摘　　要：8011铝合金是广泛使用的一种铸轧铝合金,其熔炼过程中的固液比和Al-Ti-B添加量等都是影响其性能的关键因素。利用光学显微镜(OM)、透射电子显微镜(TEM)和力学性能测试对比研究了固液比(25%、30%、35%、40%)和不同Al-Ti-B中间合金添加量(0.18%、0.20%、0.22%)对8011铝合金显微组织和力学性能的影响。结果表明:固液比相同时,Al-Ti-B中间合金添加量越高,8011铝合金的晶粒越细小,且分布越均匀;Al-Ti-B中间合金添加量相同时,固液比越高,8011铝合金的晶粒越细小,但也容易产生晶粒团聚的现象;当固液比为40%,Al-Ti-B中间合金添加量为0.22%时,8011铝合金的晶粒细化效果最好,力学性能最优,其抗拉强度可达到107 MPa,延伸率可达到12.4%,硬度为36.73 HV。8011 aluminum alloy is a widely used cast rolling aluminum alloy.The solid liquid ratio and Al-Ti-B addition amount in the melting process are key factors affecting its properties.In this paper,the effects of solid liquid ratio(25%,30%,35%,40%)and Al-Ti-B master alloy addition(0.18%,0.20%,0.22%)on the microstructure and mechanical properties of 8011 aluminum alloy were studied via optical microscope(OM),transmission electron microscope(TEM)and mechanical property tests.The results show that the higher the addition of Al-Ti-B master alloy,the finer and more uniform the grain size distribution of 8011 aluminum alloy at the same solid-liquid ratio;At the same addition amount of Al-Ti-B master alloy,the higher the solid-liquid ratio is,the smaller the grain size of 8011 aluminum alloy is,but it is easy to lead to grain agglomeration;When the solid-liquid ratio is 40%and the addition amount of Al-Ti-B master alloy is 0.22%,8011 aluminum alloy has the best grain refinement effect and mechanical properties.Its tensile strength can reach 107 MPa,elongation can reach 12.4%,and hardness is 36.73 HV.

关 键 词：8011铝合金 固液比 AL-TI-B中间合金 微观组织 力学性能 

分 类 号：TG335.13[金属学及工艺—金属压力加工] TG339