重熔对Al-Ti-La中间合金中Ti_(2)Al_(20)La相的影响  

Effect of Remelting on Ti_(2)Al_(20)La Phase in Al-Ti-La 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：《有色金属工程》2024年第8期56-66,共11页Nonferrous Metals Engineering

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：通过扫描电镜、X射线衍射和电子探针等分析研究了重熔过程中不同保温时间和温度对Al-Ti-La中间合金中Ti_(2)Al_(20)La相的含量、形态尺寸和稳定性的影响。结果表明:在750℃下,随着保温时间的延长,Ti_(2)Al_(20)La相的溶解度逐渐增大,含量由未处理的20.776%下降至13.72%,形态由块状演变为圆整和细小的片状,长宽比由2.33下降至1.52;在1000℃下,保温15 min后溶解度较大,含量降低至4.5%,形态演变为尖锐的长条状,长宽比上升至2.55;溶解产生的La原子与Al在晶界处形成La-Al金属间化合物(IMC),Ti原子在基体中的分布密度随保温时间的延长和保温温度的升高而增高,以游离态均匀分布在基体中。The effects of different holding time and temperature on the content,morphology,size and stability of the in-situ synthesis of Ti_(2)Al_(20)La phase in Al-Ti-La master alloy were studied by scanning electron microscopy,X-ray diffraction and electron probe.The results showed that the solubility of Ti_(2)Al_(20)La phase gradually increased with the extension of holding time at 750℃,the content decreased from 20.776%to 13.72%untreated,and the morphology evolved from lumpy to round and fine flakes,and the length-to-width ratio decreased from 2.33 to 1.52,and the solubility was larger at 1000℃,the content decreased to 4.5%,and the morphology evolved into sharp strips.The aspect ratio increased to 2.55,and the La-Al intermetallic compound(IMC)was formed at the grain boundary with the dissolved La atoms and Al,and the distribution density of Ti atoms in the matrix increased with the extension of holding time and the increase of holding temperature,and were uniformly distributed in the matrix in a free state.

关 键 词：Al-Ti-La合金 Ti_(2)Al_(20)La 重熔 保温时间 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG146.18[金属学及工艺—金属材料] TG665[金属学及工艺—金属学]