研究了微量Sc对Al Li Cu系2197合金的显微组织和拉伸性能的影响。采用拉伸试验和透射电镜等方法对样品进行了力学性能测试和微观组织分析。研究结果表明,δ′(Al3Li),θ′(Al2Cu)和T1(Al2CuLi)相仍为含 Sc 2197合金的主要强化相;添加微...研究了微量Sc对Al Li Cu系2197合金的显微组织和拉伸性能的影响。采用拉伸试验和透射电镜等方法对样品进行了力学性能测试和微观组织分析。研究结果表明,δ′(Al3Li),θ′(Al2Cu)和T1(Al2CuLi)相仍为含 Sc 2197合金的主要强化相;添加微量Sc使合金析出初生和次生Al3Sc颗粒,时效过程中δ′相依附在Al3Sc颗粒上析出、长大,形成Al3Li/Al3Sc复合沉淀相,但这2种颗粒的存在并未明显提高热处理可强化的2197合金的强度和塑性。展开更多
The flow stress behavior of 2197 Al-Li alloy during hot compression deformation was studied in the strain rate range from 0.01 to 10 s-1 and the temperature range from 360 to 510 ℃ by isothermal compression test on a...The flow stress behavior of 2197 Al-Li alloy during hot compression deformation was studied in the strain rate range from 0.01 to 10 s-1 and the temperature range from 360 to 510 ℃ by isothermal compression test on a Gleeble-1500 thermal-mechanical simulator. The results show that the flow stress of 2197 Al-Li alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. The peak flow stress during high temperature deformation can be represented by Z parameter in a hyperbolic sine function. The analytical expression of peak flow stress was fitted with the hot deformation activation energy of 260.6 kJ/mol.展开更多
文摘研究了微量Sc对Al Li Cu系2197合金的显微组织和拉伸性能的影响。采用拉伸试验和透射电镜等方法对样品进行了力学性能测试和微观组织分析。研究结果表明,δ′(Al3Li),θ′(Al2Cu)和T1(Al2CuLi)相仍为含 Sc 2197合金的主要强化相;添加微量Sc使合金析出初生和次生Al3Sc颗粒,时效过程中δ′相依附在Al3Sc颗粒上析出、长大,形成Al3Li/Al3Sc复合沉淀相,但这2种颗粒的存在并未明显提高热处理可强化的2197合金的强度和塑性。
基金Project(MKPT-2004-19ZD) supported by the National Defense Science, Technology and Industry Committee of China
文摘The flow stress behavior of 2197 Al-Li alloy during hot compression deformation was studied in the strain rate range from 0.01 to 10 s-1 and the temperature range from 360 to 510 ℃ by isothermal compression test on a Gleeble-1500 thermal-mechanical simulator. The results show that the flow stress of 2197 Al-Li alloy decreases with the increase of deformation temperature and increases with the increase of strain rate. The peak flow stress during high temperature deformation can be represented by Z parameter in a hyperbolic sine function. The analytical expression of peak flow stress was fitted with the hot deformation activation energy of 260.6 kJ/mol.
