论文部分内容阅读
The microstructure of dislocation in two kinds of aluminum-lithium alloys 2090 and 2090 + Ce was observed by means of TEM technology. The contributions of δ′ and T1 precipitates to strength were separately calculated by using the results of quantitative metallography and analysis of micro-deformation behavior; the co-strengthening effect of δ′ and T1 precipitates was studied. The results show that the adding relationship of co-strengthening of δ′ and T1 is in accordance with q = 1.4 form at the near peak-aged condition, i.e., 11.4 1.4 1.4?τ p = ?τ δ' + ? τT; but the adding relationship is approximately a linear relation (q = 1) at the under-aged condition and becomes the parabola form when over-aged (q = 2). The adding rela-tionship of co-strengthening contribution of δ′ and T1 is obviously dependent on aging time.
The microstructure of dislocation in two kinds of aluminum-lithium alloys 2090 and 2090 + Ce was observed by means of TEM technology. The contributions of δ 'and T1 precipitates to strength were separately calculated by using the results of quantitative metallography and analysis of micro- deformation behavior; the co-strengthening effect of δ 'and T1 precipitates was studied. The results show that the adding relationship of co-strengthening of δ' and T1 is in accordance with q = 1.4 form at the near peak-aged condition, ie , 11.4 1.4 1.4? Τ p =? Τ δ '+? ΤT; but the adding relationship is approximately a linear relation (q = 1) at the under-aged condition and becomes the parabola form when over- aged (q = 2) . The adding rela-tionship of co-strengthening contribution of δ 'and T1 is obviously dependent on aging time.