Precipitate microstructure of peak-aged 7075 Al

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  • Cited by (66)

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      Citation Excerpt :

      During the aging process of AA7075, finely dispersed MgZn2 precipitates are formed in the matrix according to the usual sequence followed by Al 7xxx series [8–10]:SSSS (α-phase) => Guinier-Preston (GP) zone => Metastable MgZn2 (η′) phase => Stable MgZn2 (η) phase. The metastable η′ precipitate is the main constituent strengthening factor in peak-aged (T6 and T651) AA7075 [11–13] due to its existence in abundance and strong pinning effect on dislocations which strengthens the material [4,6]. On account of the extraordinary combination of properties manifested in the T6 condition such as high mechanical strength, light weight, dimensional stability, machinability, good vibration-damping characteristics and specific stiffness, AA7075 is widely used in this temper state for structural applications in aerospace, military and automobile industries, for example, in aircraft fittings, fuse parts, shafts and gears, missile parts, regulating valves, worm gears, sensor and guidance components for flight and satellite systems, etc. [14–16].

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