Papers by Keyword: GPB Zone

Abstract: In this paper it is investigated the ageing dynamics of Al-4.2Cu-1.5Mg alloy aged at 170°C for different time. Vickers hardness and transmission electron microscopy were employed to test the hardness and microstructures of the aged alloy. It was found that there are two peaks in the curve. The first peak is attributed to the cluster hardening and the second peak is ascribed to the contribution of GPB zones.

Abstract: The precipitates of bending-age-formed ternary Al-4.31Cu-1.51Mg alloy were studied with load of 6.05 kg aged at 190°C. Transmission electron microscopy and electron diffraction has been used to observe the microstructures of the bend-age-formed alloy. The results show that there is no preferential alignment of S phase or GPB zones in the alloys with load compared with that without load. It is interesting to find that the length of S phase is shorter in age-formed sample than that without load. Dislocations generated after loaded can provide enough nucleation sites for the nucleation and growth of S phase.