(西北工业大学 机电学院， 西安 710072)
摘 要: 采用TEM观察2090和2090＋Ce两种铝锂合金中δ′相和T1相与位错的交互作用行为， 利用图形定量分析结果和微观变形理论分别计算两个相的强化贡献， 进而分析两相复合强化作用形式。 分析结果表明： 在近峰值时效区域， δ′和T1相强化作用的叠加关系与q=1.4的关系符合较好； 欠时效时， δ′、 T1相强化贡献的叠加关系接近线性关系(q=1)； 过时效时， 却与抛物线型关系(q=2)符合较好。 δ′和T1相强化作用的叠加关系对时效时间表现出较强的依赖性。
关键字: 铝锂合金; 沉淀相; 强化
（ School of Mechatronic Engineering, Northwestern Polytechnical University,
Xi'an 710072, China）
Abstract: The microstructures of dislocation in two kinds of aluminum-lithium alloy 2090 and 2090+Ce were observed by TEM. The contribution of precipitates of δ′ and T1 phases were separately calculated by the results of quantitative metallography and micro-deformation theory. Furthermore, the co-strengthening effects of δ′ and T1 phases were studied. The results show that the adding relationship of co-strengthening of δ′ and T1 phases accords with that of q=1.4 at near peak-aged condition. But the adding relationship is approximately linear relation (q=1) at under-aged condition, and become parabola form at over-aged (q=2). The adding relation of co-strengthening contribution of δ′ and T1 phases is obviously dependent on aging time.
Key words: aluminum-lithium alloy; precipitates phase; strengthening
