激光熔化沉积连接钛-铝异质合金工艺及组织性能研究  

Process,Microstructure and Properties of Titanium-Aluminum Heteroalloy Connected by Laser Melting Deposition

作　　者：尚晓峰 孙晨 赵宇辉[2] 贺晨 赵吉宾[2] Shang Xiaofeng;Sun Chen;Zhao Yuhui;He Chen;Zhao Jibin(School of Mechanical and Electrical Engineeing,Shenyang Aerospace University,Shenyang 110136,China;Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳航空航天大学机电工程学院,辽宁沈阳110136 [2]中国科学院沈阳自动化研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2024年第12期3493-3502,共10页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2022YFB4602203);辽宁省博士科研启动基金(2022-BS-026);内蒙古自治区重点研发和成果转化计划项目(2023KJHZ0029)。

摘　　要：为解决物性参数差异大的TC4-7075异质合金的连接难题,拓展高比强度钛-铝异质合金复合结构的应用范围。选用AlTiVNbSi高熵合金为中间层材料,采用激光熔化沉积技术实现了TC4和AA7075异质合金的有效连接,采用OM、SEM、EBSD对连接区的宏观形貌、显微组织、界面组织和成分分布进行观察分析,并对连接件的显微硬度和抗拉强度进行检测。结果表明,连接接头与TC4钛合金侧界面结合良好,存在宽度约为20μm的界面过渡区,靠近界面的TC4有集束魏氏组织产生,7075侧界面存在宽度为20μm的化合物区。基于高熵合金的以AlTiVNbSi为中间层材料,采用激光熔化沉积技术可实现钛-铝异质合金的有效连接,连接接头硬度(HV)约为6822.37 MPa,高于母材硬度,近钛侧连接区硬度高于近铝侧连接区硬度,抗拉强度为116 MPa。To overcome the difficulty in connecting TC4-7075 heteroalloy with large differences in physical parameters,and to expand the application range of high specific strength titanium-aluminum heteroalloy composite structure,AlTivNbSi high-entropy alloy was selected as the intermediate layer material,and the effective connection of TC4 and AA7075 heteroalloys was realized by laser melting deposition technology,and the macromorphology,microstructure,component distribution and interface characteristics of the junction area were characterized by OM,SEM,EBSD,microhardness and tensile experiment.The results show that the connection joint is well combined with the TC4 titanium alloy side interface,and there is an interface transition zone with a width of about 20μm.Weisler tissue is bundled on TC4 near the interface,and a compound area with a width of 20μm exists at the 7075 side interface.Based on AITiVNbSi as the intermediate layer material of high-entropy alloy,laser melting deposition technology can realize the effective connection of titanium-aluminum heteroalloy,the hardness(HV)of the joint is about 6822.37 MPa,which is higher than that of the base metal,the hardness of the connecting zone on the near titanium side is higher than that of the connecting zone on the aluminum side,and the tensile strength is 116 MPa.

关 键 词：钛-铝异质合金 激光熔化沉积 显微组织 力学性能 

分 类 号：TG456.7[金属学及工艺—焊接]