兰州理工大学学报

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (4): 11-16.

• 材料科学与工程 • 上一篇    下一篇

微量Fe、Ni和Ti复合对Al-20Si合金微观组织及其性能的影响

张杰1, 张宇2, 王平波1,3, 王凯龙1, 兰晔峰1, 李庆林*1   

  1. 1.兰州理工大学 材料科学与工程学院, 甘肃 兰州 730050;
    2.中国电子科技集团公司第五十二研究所,浙江 杭州 311100;
    3.西北工业大学 凝固技术国家重点实验室,陕西 西安 710072
  • 收稿日期:2023-01-06 出版日期:2023-08-28 发布日期:2023-08-29
  • 通讯作者: 李庆林(1978-),男,甘肃临洮人,博士,教授,博导. Email:liql301@mail.nwpu.edu.cn
  • 基金资助:
    国家自然科学基金(51561021),甘肃省重点研发计划项目(21YF5GA075),甘肃省研究生创新之星(2023CXZX-392)

The influences of trace Fe,Ni and Ti complex addition on the microstructure and mechanical properties of Al-20Si alloy

ZHANG Jie1, ZHANG Yu2, WANG Ping-bo1,3, WANG Kai-long1 LAN Ye-feng1, LI Qing-lin1   

  1. 1. School of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. The 52th Research Institute of China Electronic Technology Group Corporation, Hangzhou 311100, China;
    3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2023-01-06 Online:2023-08-28 Published:2023-08-29

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摘要： Fe、Ni和Ti元素以AlFeNiTi中间合金的形式添加,AlFeNiTi中间合金(原子比1∶1∶1∶1)通过真空电弧熔炼炉进行熔配,研究中间合金添加量(0.5%、1.0%、1.5%、2.0%、2.5%,质量分数)对Al-20Si合金中Si相、α-Al和力学性能的影响.结果表明:当Al-20Si合金中添加2.0%AlFeNiTi中间合金时,初生Si的形貌由粗大不规则块状和五瓣星状变质为细小规则的块状,其平均尺寸从未变质时的91 μm减小到40 μm,减小56.1%;共晶Si形貌从粗大的针片状变质为边缘钝化的细小粒状,而且α-Al的二次枝晶显著减小,形貌由粗大树枝晶细化为蔷薇状组织.合金的抗拉强度由129 MPa(未变质合金)增加到182 MPa(2.0%AlFeNiTi变质),增加了41.1%,延伸率由0.8%提高到1.43%,提高了78.7%.

关键词: Al-20Si合金, AlFeNiTi中间合金, 微观组织, 力学性能

Abstract: The elementsFe, Ni and Ti were added in the form of AlFeNiTi master alloy (atomic ratio 1∶1∶1∶1), which were fused by vacuum arc melting furnace, andthe influence of the addition amounts of the master alloy (0.5%,1.0%,1.5%,2.0%,2.5%, mass fraction) on Si phase, α-Al and mechanical properties of Al-20Si alloy were studied. The results showed that when the addition concentration of AlFeNiTi master alloy is 2.0%, the morphology of primary Si is transferred from coarse irregular block and five folds to fine and regular block and its average size is reduced from 91 μmto 40 μm by 56.1%. The eutectic Si is modified from coarse needle/flake-like morphology to the edge passivation and fine granular shape. Moreover, the primary α-Al is refined from coarse dendrites to fine rosette-like structure and the secondary arm dendrites spacing is significantly decreased, and the ultimate tensile strength(UTS)is increased by 41.1% from 129 MPa to 182 MPa, and the elongation(EL) isenhanced by 78.7% from 0.8% to 1.43%.

Key words: Al-20Si alloy, AlFeNiTi master alloy, microstructure, mechanical properties

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