Ti/Al 微叠层复合板单向拉伸与胀形性能

Ti/Al micro-laminated composite sheet with alternate arrangement of Ti/TiAl₃/Al laminate microstructure was fabricated through vacuum hot-pressing method. The uniaxial tensile deformation behavior at high temperature and the bulging formability were investigated by uniaxial tensile experiment and gas bulging experiment, respectively. The results show that the composite sheet hot pressed for 15 min exhibits better plastic deformation behavior because the hard and brittle TiAl₃ layer is thin. When the composite is deformed at elevated temperatures, the cracks of the composite sheet are blunted, which inhibits the propagation of cracks in TiAl₃ layer, so the elongation and limiting bulging rate at 600 ℃ reach 135% and 45%, respectively. At the top region of the bulged spherical shell, the Ti layer and Al layer both undergo severe deformation and are necked, the Ti/Al interface is wavy, the TiAl₃ layer breaks into islands, with Al layer filling their gaps, and no cracks are formed.