细晶Mg-Al-Ti-C中间合金的制备及其对AZ91D组织和性能的影响

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英文篇名：Preparation of Fine-grained Mg-Al-Ti-C Master Alloy and Its Effect on Microstructure and Properties of AZ91D Alloy 作者：孟宏杰 ; 董天顺 ; 叶校瑛 ; 刘利 ; 王拓 英文作者：MENG Hong-jie;DONG Tian-shun;YE Xiao-ying;LIU Li;WANG Tuo;Department of Mechanical Engineering,Tangshan Polytechnic College;School of Materials Science and Engineering,Hebei University of Technology; 关键词：两步法 ; 铜模喷铸 ; Mg-Al-Ti-C中间合金 ; AZ91D合金 英文关键词：two-step method;;copper mold inject casting;;Mg-Al-Ti-C master alloy;;AZ91D alloy 中文刊名：METE 英文刊名：Nonferrous Metals(Extractive Metallurgy) 机构：唐山工业职业技术学院机械工程系;河北工业大学材料科学与工程学院; 出版日期：2019-02-12 出版单位：有色金属(冶炼部分) 年：2019 基金：河北省高等学校科学技术研究项目(ZD2014040) 语种：中文; 页：METE201902013 页数：5 CN：02 ISSN：11-1841/TF 分类号：60-64

摘要

采用两步法+铜模喷铸的方式制备具有颗粒增强和细晶强化作用的Mg-Al-Ti-C中间合金,并研究了其对AZ91D组织和性能的影响。通过OM、SEM、XRD、硬度及拉伸试验对中间合金和AZ91D的组织形貌和力学性能进行分析。结果表明,两步法制备得到了Mg-Al-Ti-C中间合金,经过铜模喷铸后,TiC颗粒尺寸大幅度减小,且弥散分布于Mg-Al-Ti-C中间合金中;用该细晶Mg-Al-Ti-C中间合金处理AZ91D,后者的抗拉强度提高了19.8%,硬度提高了64.9%;TiC颗粒既有颗粒增强作用,也能作为AZ91D凝固时的异质形核核心,起到细晶强化作用。
        Mg-Al-Ti-C master alloy with particle reinforcement and fine crystal strengthening was prepared by two-step method and copper mold inject casting.Effects of Mg-Al-Ti-C master alloy on microstructure and properties of AZ91 Dwere investigated by means of OM,SEM,XRD,hardness test and tensile test.The results show that Mg-Al-Ti-C master alloy was produced by two-step method,and TiC particles are dispersedly distributed in Mg-Al-Ti-C master alloy with their sizes becoming much smaller.After treatment with Mg-Al-Ti-C master alloy,tensile strength and hardness of AZ91 Drise by 19.8% and64.9%respectively.Besides particle reinforcing effect,TiC particles can also be used as heterogeneous core of AZ91 Dto strengthen substrate.

引文

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