Al-3Ti-4.35La中间合金的制备及其细化变质效果  

Preparation and Refinement Modification Effect of Al-3Ti-4.35La Master Alloy

作　　者：丁万武[1,2] 田旭东[1,2] 陈建超 安家志 余海存 魏振鹏 杨成亮 DING Wanwu;TIAN Xudong;CHEN Jianchao;AN Jiazhi;YU Haicun;WEI Zhenpeng;YANG Chengliang(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Dongxing Aluminum Co.,Ltd.,Jiayuguan 735100,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学材料科学与工程学院,兰州730050 [3]甘肃东兴铝业有限公司,甘肃嘉峪关735100

出　　处：《有色金属(中英文)》2025年第3期348-360,共13页Nonferrous Metals

基　　金：国家自然科学基金资助项目(52161006);甘肃省教育厅产业支持计划项目(2021CYZC-23);有色金属产业研究院成果转化项目;甘肃省中央引导地方科技发展资金项目(23ZYQB309)。

摘　　要：通过SEM、XRD和DSC等手段分析研究了不同保温时间和温度对Al-3Ti-4.35La中间合金中Ti_(2)Al_(20)La相的含量、形态尺寸和形成过程的影响规律,并探究Al-3Ti-4.35La中间合金对Al-7Si合金细化变质的影响。结果表明:在1 150℃下,保温4 min时Al-3Ti-4.35La中间合金中Ti_(2)Al_(20)La相以块状形态均匀分布在基体中,且其含量最高为20.78%,长宽比为2.33;向Al-7Si合金中添加0.2%Al-3Ti-4.35La中间合金后,其α-Al的二次枝晶臂间距、共晶Si的平均尺寸及长宽比分别由未添加的18.33μm、8.91μm、6.6下降至13.88μm、6.12μm、4.1,且粗大的片状共晶Si向棒状转变,具有良好的细化变质效果。In this paper,the effects of holding times and temperatures on the content,morphology,size and formation process of the Ti2Al20La phase in Al-3Ti-4.35La master alloy were studied by SEM、XRD and DSC.Meanwhile,the effect of Al-3Ti-4.35La master alloy on the refinement and metamorphic of Al-7Si alloy(0.2%)was also studied.The results show that the content and the aspect ratio of Ti2Al20La phase in Al-3Ti-4.35La master alloy is 20.78%and 2.33 at 1150℃for 4 min,respectively,and the Ti2Al20La phase distribute uniform in the matrix in a block-like form.After adding 0.2%Al-3Ti-4.35La master alloy to Al-7Si alloy,the spacing of the secondary dendrite arms ofα-Al,the average size and the aspect ratio of eutectic Si in Al-7Si alloy decreases from 18.33μm,8.91μm and 6.6 to 13.88μm,6.12μm and 4.1,respectively.Meanwhile,the coarse flake-like eutectic Si transform into a rod,which has a good refinement and metamorphic effect.

关 键 词：Al-3Ti-4.35La合金 Ti_(2)Al_(20)La 细化变质 Al-7Si合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]