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研究了Al-Cu-Mg-Ag合金经时效处理165℃×2 h(欠时效态)后,在不同温度(150~300℃)和不同时间(0~1000 h)热暴露后的显微组织和性能.结果表明:在150℃热暴露下,随时间延长,其剩余强度先上升后下降,强度峰值出现在100 h,在1000 h后合金力学性能相对欠时效态无明显下降;在200~300℃热暴露时,合金的强度随时间的延长而下降,延伸率随着时间的延长而增大;在300℃热暴露时,合金的强度明显下降,暴露10 h后其抗拉强度为272.5 MPa,100 h后其抗拉强度降至114.5 MPa.欠时效状态的合金组织主要为均匀细小分布Ω相;随着暴露温度的升高,Ω相长大并粗化,晶界无析出带(PFZ)变宽.
The microstructure of Al-Cu-Mg-Ag alloy after heat exposure at different temperatures (150 ~ 300 ℃) and different times (0 ~ 1000 h) after aged at 165 ℃ for 2 h The results show that the residual strength first increases and then decreases with the increase of time under the heat exposure of 150 ℃, the peak intensity appears at 100 h, and the relative underaged state of alloy has no obvious decrease after 1000 h. At 300 ℃ thermal exposure, the strength of the alloy decreases with time, and the elongation increases with time. The strength of the alloy decreases obviously after heat exposure at 300 ℃, and the tensile strength after exposure for 10 h is 272.5 MPa and 100 h, the tensile strength decreased to 114.5 MPa.The microstructure of the under-aged state was mainly uniform and small distribution Ω phase.With the increase of the exposure temperature, the Ω phase grew and coarsens, the grain boundary had no precipitation PFZ) widens.