研究了两种Al-Li基合金的时效硬化、拉伸和冲击等力学行为,用透射电镜和扫描电镜对合金的显微组织结构,变形和断裂的特征进行了分析。结果指出:同一成分、不同热处理态的合金变形和断裂的机制截然不同。分析了时效态合金韧性下降和产生冲击各向异性的原因。讨论了改善Al-Li合金塑、韧性的可能途径。
The aging response, tensile and impact properties of two kinds of Al-Li based alloys have been studied. The microstructure, deformation as well as frac-ture behaviour have been observed by SEM and TEM. It has been found that themechanism of deformation and fracture for different heat-treated alloys with thesame chemical composition is quite different. The cause led to the drop of ductili-ty, toughness as well as anisotropy in peak-aged alloys have been analysed. Finally,possible methods to improve the ductility and toughness of the alloys have beendiscussed.
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