不同时效状态2024铝合金组织与性能  

Investigation on the microstructure and properties of 2024 aluminum alloy under different ageing conditions

作　　者：汝继刚[1] 伊琳娜[1] 臧金鑫[1] 李惠曲[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《塑性工程学报》2013年第3期121-125,共5页Journal of Plasticity Engineering

摘　　要：对T42和T62两种典型状态下2024合金进行室温拉伸、稳定化后室温拉伸、高频疲劳、晶间腐蚀性能及微观组织特征的研究表明,T42和T62状态下,合金的抗拉强度基本相当,但T62状态合金由于S′相析出物的弥散强化作用,其屈服强度高于T42状态,而塑性则低于T42状态;T42和T62状态合金在温度125℃、175℃以下,均具有良好的力学性能与组织稳定性,但T62状态合金的热稳定性整体优于T42状态合金;T62状态合金与T42状态合金的高频轴向疲劳性能及晶间腐蚀性能无明显差异。The room temperature tensile properties before and after thermal exposure, high-cycle fatigue properties, intergranular corrosion properties and microstructure of 2024 aluminum alloy in two typical ageing conditions, namely T42 and T62, were sys- tematically investigated in the present research. The results indicate that alloy in T62 condition has equivalent tensile strength, higher yield strength and lower elongation than that in T42 condition, mainly due to the dispersion strengthening effect induced by S＇ precipitates. The thermal stability of mechanical properties and microstructure for alloy in T62 condition is superior to that in T42 condition, and the temperature under which the alloy has good stabilities are 175℃ and 125℃ respectively. The alloy in T62 condition and in T42 condition shows no apparent difference in fatigue limit and intergranular corrosion properties.

关 键 词：2024铝合金 热暴露 高频疲劳 腐蚀 

分 类 号：TG146.2[一般工业技术—材料科学与工程]