2A66铝锂合金时效行为的研究

The Aging Behavior of Aluminum-Lithium Alloy 2A66

通过DSC分析、硬度测试、拉伸测试、SEM和TEM检测等手段,研究了2A66铝锂合金时效组织和性能的变化.研究结果表明:对于同一时效温度,随着时效时间的延长,强度出现峰值;时效温度越高,出现峰值的时间越短.2A66铝锂合金最佳的峰值时效制度为165℃保温64h,此时合金获得了良好的强塑性结合,硬度为146 HB,抗拉强度为526.5MPa,屈服强度为448.9 MPa,延伸率为10.1%.165℃时效过程中合金的主要强化相为δ',θ'和T_1相,时效初期合金的主要强化来源为GP区、δ'和θ'相,峰值时效时合金的主要强化相为θ'和T_1相.

The evolution of microstructures and the properties of 2A66Al-Li alloy during artificial aging was studied with differential scanning calorimetry（DSC）,hardness measurement,tensile testing,scanning electron microscope（SEM）and transmission electron microscope（TEM）.The results indicate that the strength can reach the peak value with the increase of aging time,and the higher the aging temperature,the shorter the time for peak value.The best aging process for peak value of 2A66Al-Li alloy ages at 165 ℃for 64 hand the alloy gets a good combination of strength and plasticity.Its hardness,σb,σ0.2andδare 146 HB,526.5 MPa,448.9 MPa,10.1%.Theδ＇,θ＇and T1 phases are the major precipitates of2A66 alloy ageing at 165 ℃.At the early stage of aging,the main source of strengthening for the alloy is the GP zone,δ＇phase andθ＇phase.At the peak of aging,theθ＇phase and T1 phase are the main strengthening phases.