铸轧法制备钛铝复合板的界面组织与性能

Interfacial Microstructure and Properties of Ti-Al Rolling-casted Composite Plate

通过万能试验机、MH-3显微硬度计、光学显微镜、SEM以及EDS和XRD研究了采用铸轧法制备的Ti/Al复合板的力学性能、界面和断口形貌及物相分析。结果表明,铸轧法生产的Ti/Al复合板抗拉强度为172.3 MPa,大于理论值135.6 MPa;界面层显微硬度(HV)介于Ti、Al之间,局部由于生成TiAl3而高达450;复合板的界面呈平直状,界面层主要是由扩散形成的冶金结合层,局部区域有少量的金属间化合物TiAl3生成;拉伸时出现翘曲和分离现象,两种金属的断裂均为韧性断裂。

Mechanical properties,interface,fracture morphology and composition analysis of the Ti-Al composite plate prepared by cast-rolling method were investigated by universal testing machine,MH-3micro hardness meter,optical microscope,SEM and EDS and XRD.The results indicate that the tensile strength of Ti-Al composite plate prepared by cast-rolling method reaches 172.3MPa,which is the greater than the theoretical value of 135.6 MPa.Micro hardness of the interface layer is between the two metals,and mico-hardness in partial zone reaches 450 HV due to generating TiAl3 phase.The interface layer exhibits flat-straight structure,which is formed mainly metallurgical bonding layer by diffusion,and there exists a small amount of intermetallic compound TiAl_3 generated in partial zone.There is a phenomenon of warping and separation when the composite plate is stretched,and the fracture of the two metals is characterized by ductile fracture.