【摘要】 对固溶态2050铝锂合金挤压棒材施加1%～5%的预拉伸变形量，研究预拉伸变形量对该合金力学性能的影响。结果表明：合金经固溶淬火处理后，基体内大部分相回溶，局部区域出现了小尺寸再结晶晶粒。当预拉伸变形量增加到5%,2050铝锂合金的屈服强度增加幅度较大，由固溶态的321 MPa增加到470 MPa;抗拉强度的增幅较小，由固溶态的489 MPa增加到534 MPa;伸长率由固溶态的27.1%降低到15.0%;屈强比由固溶态的65.6%增加到88.0%。固溶态2050铝锂合金挤压棒材经2%预拉伸处理和155℃72 h的时效处理后，抗拉强度、屈服强度、屈强比和伸长率分别为587 MPa、555 MPa、94.5%和9.8%,接近AMS 4353标准要求，达到了2050铝锂合金T84状态的性能指标。从合金的综合性能考虑，预拉伸变形量宜控制在1%～3%之间。更多还原

【Abstract】 The extruded rod of the solution-treated 2050 aluminum-lithium alloy was subjected to a pre-stretching deformation of 1%-5% to study the influence of pre-stretching deformation on the mechanical properties. The research results show that after solution treatment, most of the phases in the alloy matrix are redissolved, and there are a few small-sized recrystallization grains in the local area. As the pre-stretching deformation increases to 5%, the yield strength of 2050 aluminum-lithium alloy increases greatly from 321 MPa in the solid solution state to 470 MPa; the tensile strength increases slightly from 489 MPa in the solid solution state to 534 MPa; the elongation decreases slowly from 27.1% in the solid solution state to 15.0%; and the yield-tensile strength ratio increases from 65.6% in the solid solution state to 88.0%.The tensile strength, yield strength, yield ratio and elongation of solution 2050 Al-Li alloy extruded rod are 587 MPa, 555 MPa, 94.5% and 9.8% respectively after 2% pre-stretching treatment and 155 ℃, 72 h aging treatment. The values are close to the standard AMS 4353 and reach the 2050-T84 state performance requirement. Thus it is recommended that the amount of pre-stretching deformation be controlled between 1% and 3%.更多还原