摘要
在450℃单道次等通道转角挤压(ECAP)结合退火工艺制备钛铝双金属复合棒材,利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)等方法研究了不同退火温度条件下钛铝双金属复合棒材的结合行为,并通过显微硬度试验、剪切试验测试其界面结合性能。结果表明,在ECAP提供的剧烈剪切力作用下,基体金属形成了牢固的机械结合,后续退火处理促进Ti、Al原子扩散,钛铝双金属复合棒材在界面结合处形成了良好的冶金结合,界面扩散层厚度从580℃退火时的1.17μm升高至620℃退火时的4.43μm。本试验条件下,Ti/Al扩散层的金属间化合物主要为TiAl、Ti_(3)Al和TiAl_(3),当退火温度高于600℃以时,会有少量的金属间化合物Ti_(2)Al_(5)产生。Ti/Al扩散层的显微硬度和剪切强度随退火温度的升高而增加。当退火温度为620℃时,钛铝双金属复合棒材结合效果最优,Ti/Al扩散层的显微硬度和剪切强度分别为99.72 HV0.1和19.84 MPa。
Ti/Al bimetallic composite bar was prepared by ECAP at 450℃combined annealing process.The interfacial bonding behavior of the Ti/Al bimetallic composite bar at different annealing temperatures was studied by means of SEM,EDS and XRD,and the interfacial bonding properties were tested through microhardness test and shear test.The results show that under the action of severe shear force provided by ECAP,a firm mechanical bond is formed.The subsequent annealing process promotes the diffusion of Ti and Al atoms,and the Ti/Al bimetallic composite bar forms a good metallurgical bond at the interface bond where the interfacial diffusion layer increases from 1.17μm(annealing at 580℃)to 4.43μm(annealing at 620℃).Under the experimental conditions,the intermetallic compounds of Ti/Al diffusion layer are mainly TiAl,Ti_(3)Al and TiAl_(3).When the annealing temperature is higher than 600℃,a small amount of intermetallic compound Ti_(2)Al_(5)will be produced.The microhardness and shear strength of Ti/Al diffusion layer increase with the annealing temperature rising.When the annealing temperature is 620℃,the bonding effect of the Ti/Al bimetallic composite bar is the best,and the microhardness and shear strength of Ti/Al diffusion layer are 99.72 HV0.1 and 19.84 MPa,respectively.
作者
张飞
王晓溪
张翔
董清照
Zhang Fei;Wang Xiaoxi;Zhang Xiang;Dong Qingzhao(School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng Jiangsu 224051,China;School of Mechanical and Electrical Engineering,Xuzhou University of Technology,Xuzhou Jiangsu 221018,China;Jiangsu XCMG Construction Machinery Research Institute Co.,Ltd.,Xuzhou Jiangsu 221004,China)
出处
《金属热处理》
北大核心
2025年第7期118-124,共7页
Heat Treatment of Metals
基金
国家自然科学基金(51905462)
江苏省自然科学基金(BK20201150,BK20221212)
江苏省高校自然科学研究重大项目(21KJA460007)
江苏省“333高层次人才工程”培养项目。
关键词
钛铝双金属复合棒材
ECAP
退火温度
界面结合行为
Ti/Al bimetallic composite bar
ECAP
annealing temperature
interface binding behavior
作者简介
张飞(2000-),男,硕士研究生,主要研究方向为大塑性成形工艺及理论,E-mail:k423jofny@163.com;通信作者:王晓溪,教授,博士,E-mail:xiaoxi119@vip.163.com。
