High pressure deformation induced precipitation in Al–Zn–Mg–Cu alloy (Al7075)

Precipitate-matrix interactions govern the mechanical behavior of precipitate strengthened Al-based alloys. These alloys find a wide range applications ranging from aerospace to automobile and naval industries due their low cost high strength weight ratio. Structures made undergo complex loading conditions such as strain rate impact, which involves pressures. Here we use diamond anvil cells study Al7075 alloy under quasi-hydrostatic non-hydrostatic pressure up ~53 GPa. In situ X-ray diffraction (XRD) pre- post-compression transmission electron microscopy (TEM) imaging are used analyze microstructural changes estimate strength. We bulk modulus 75.2 +- 1.9 GPa using XRD measurements. showed that leads significant increase in defect density peak broadening with cycling. mapping revealed region highest local had greatest nucleation, whereas largest gradient underwent texturing larger grains. TEM analysis cycling led nucleation growth many precipitates. The an for at