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对具有柱状晶组织的铸态全片层Ti-46Al-0.5W-0.5Si合金纵向和横向试样进行了室温拉伸、室温压缩和三点弯曲试验,并对拉伸试样断口进行了分析。结果表明:铸态全片层Ti-46Al-0.5W-0.5Si合金力学性能存在强烈的各向异性。横向试样的拉伸性能和弯曲性能远远优于纵向试样,但压缩屈服强度低。合金的力学性能取决于加载轴与片层界面的角度,而不是柱状晶轴的方向。横向拉伸试样的拉应力与片层界面平行,α2/γ片层相界面对裂纹的阻碍作用对提高拉伸性能起到了重要作用。纵向压缩试样的压应力与片层界面垂直,使片层间的微裂纹闭合不扩展,压缩屈服强度较横向试样高。
Longitudinal and transverse specimens of as-cast full-layer as-cast Ti-46Al-0.5W-0.5Si alloy with columnar grain structure were subjected to room temperature tensile test, room temperature compression test and three-point bending test. Fracture specimens were analyzed . The results show that there is a strong anisotropy in the mechanical properties of as-cast full-layer Ti-46Al-0.5W-0.5Si alloy. The tensile properties and flexural properties of the transverse specimens are much better than those of the longitudinal specimens, but the compressive yield strength is low. The mechanical properties of the alloy depend on the angle at which the axis of the loaded shaft and lamella interface, rather than the orientation of the columnar crystal axis. The tensile stress of the transverse tensile specimen is parallel to the interface of the lamella, and the interfacial adhesion of the α2 / γ lamellae to the crack plays an important role in improving the tensile property. The compressive stress of the longitudinal compressive specimen is perpendicular to the interface of the sheet, so that the microcracks between the sheets do not expand and the compressive yield strength is higher than that of the transverse specimen.