2397铝锂合金显微组织、拉伸性能和断裂韧性研究

发布时间：2018-05-09 10:16

本文选题：铝锂合金 + 织构　；参考：《稀有金属材料与工程》2015年01期

【摘要】：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方向㧐LT方向㧐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。
[Abstract]:The microstructure of 130mm thick 2397-T87 Al-Li alloy with different thickness and orientation was studied by metallographic microscope, transmission electron microscope and 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 texture distribution in the thickness direction is uneven, the surface layer texture is mainly Gao Si texture, the center texture is mainly composed of 尾 -orientation rolling texture and a little cubic texture, and the sub-surface T / 8 texture is weak. From the center to the subsurface layer, the content of 尾 -oriented texture and cubic texture decreased, while the shear texture content increased. The tensile properties of different thickness layers with maximum shear texture content in the direction of T / 8 showed inhomogeneity. The tensile strength (蟽 b) and yield strength (蟽 0.2) of the subsurface layer are smaller than those of the central LT direction. The strength and fracture toughness of the alloy are anisotropic, and the variation rule of 蟽 b and 蟽 0.2 is that the fracture toughness is the best in the SL orientation and the second in the SL direction, followed by the S-L orientation.
【作者单位】：中南大学有色金属材料科学与工程教育部重点实验室;上海飞机设计研究院;
【分类号】：TG146.21

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