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研究了一种高强AI-Li-Cu-Mg-Zr合金薄板材料,在100～250℃时的高温拉伸性能和高温变形特征.实验结果表明,合金在200℃拉伸时屈服强度可达室温屈服强度的70%以上,显示出良好的高温拉伸性能.高温变形时的强化与被切割的δ’ 粒子,重新恢复有序结构以及热激活形成的交滑移障碍有关.随着变形温度提高,时效前的预变形引起的强化作用减弱.高温变形时,形成以位错网络和胞状亚结构为特征的变形组织.
The high-temperature tensile properties and high temperature deformation characteristics of a high strength Al-Li-Cu-Mg-Zr alloy sheet at 100 ~ 250 ℃ have been studied.The experimental results show that the yield strength of the alloy reaches to room temperature Yield strength of more than 70%, showing good high-temperature tensile properties.High-temperature deformation of the strengthening and cutting of δ ’particles, to restore the orderly structure and thermal activation of the formation of the cross-slip obstacles related to the deformation temperature increases , Pre-aging pre-deformation caused by strengthening the role of weakening.High temperature deformation, the formation of dislocation network and cellular sub-structure is characterized by deformation of the organization.