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通过金相显微镜、透射电镜和扫描电镜观察以及X射线织构测量、拉伸试验和平面应变断裂韧性测试,研究了130 mm厚2397-T87铝锂合金不同厚度层及不同取向的微观组织、拉伸性能和断裂韧性。结果表明:厚度方向织构分布不均匀,表层织构以高斯织构为主,中心织构则主要由β取向轧制织构和少量立方织构组成,亚表层T/8处织构较弱,且从中心到亚表层,β取向织构和立方织构含量降低,剪切织构含量增加,T/8处剪切织构含量最大。L方向不同厚度层拉伸性能具有不均匀性,亚表层的抗拉强度(σb)和屈服强度(σ0.2)小于中心,LT方向拉伸性能差异相对较小;同一厚度处,合金强度和断裂韧性具有各向异性,σb、σ0.2的变化规律为:L方向﹥LT方向﹥SL方向,L-T取向的断裂韧性最好,T-L取向次之,S-L取向最差。
The microstructures of different thickness layers and different orientations of 13097-T87 Al-Li alloy were investigated by optical microscope, transmission electron microscope, scanning electron microscope, X-ray texture measurement, tensile test and plane strain fracture toughness test. Tensile properties and fracture toughness. The results show that the distribution of texture in the thickness direction is inhomogeneous, the texture of the surface layer is Gaussian texture, the central texture is mainly composed of β-oriented rolled texture and a small amount of cubic texture, and the texture of T / 8 in the subsurface layer is weak , And from the center to the subsurface, the content of β orientation texture and cubic texture decreased, the content of shear texture increased, and the content of shear texture at T / 8 was the largest. The tensile properties of different thickness layers in the L direction are inhomogeneous, the tensile strength (σb) and yield strength (σ0.2) of the subsurface are less than the center, and the tensile properties in the LT direction are relatively small. At the same thickness, The fracture toughness has anisotropy. The variation rules of σb and σ0.2 are as follows: L direction> LT direction> SL direction. The fracture toughness of LT orientation is the best, followed by TL orientation and SL orientation is the worst.