Abstract
The present study investigated the effect of the rare earth element neodymium (Nd) on the strengthening mechanism and precipitation morphology high-temperature stability of Al–Zn–Mg–Cu–Zr aluminum alloy. By using transmission electron microscopy (TEM), hardness, and tensile testing, the following conclusions were drawn after thermal exposure of Al–Zn–Mg–Cu samples at three different temperatures: (i) the addition of Nd resulted in the presence of more substructures and fine equiaxed grains within the alloy, (ii) Nd effectively inhibited the growth of precipitates, retained more strengthening phases, and exhibited improved stability at high temperatures, (iii) Nd-added alloy maintained high hardness (160.8 HV) and strength (482.3 MPa) at 135 °C, which was attributed to the presence of thermally stable nano-scale Al3Nd particles which hindered dislocation movement. In summary, the Nd-added alloy demonstrated an enhanced thermal stability at 135 °C.
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