【摘要】 研究了Al-Li合金在单向受力状态下的形变特征与断裂行为,测试了不同时效状态合金的慢拉伸裂纹扩展速率与应力强度因子的关系结果表明,不同时效合金的范性形变机制、微观断裂模式和慢拉伸裂纹扩展阻力不同,它们视微观组织和晶界状态而异,应变局部化是低塑性的根源更多还原

【Abstract】 The deformation and fracture behavior of an Al-Li alloy have been investi-gated under slow tensile loading. The relatioship between stress intensity factor and crackgrowth rate has been determined for various aging conditions of the alloy. Plasticdeformation mechanism, microfracture mode and crack growth resistance are different forvarious aging temperatures due to various microstructures. It was indicated that the strainlocalization was the reason for low plastisity and the strain localization closely related to thestate of grain boundaries. The relation between macroproperties and microdeformation char-acteristics has also been determined.更多还原