J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (5): 885-890.DOI: 10.1016/j.jmst.2018.11.022
• Orginal Article • Previous Articles Next Articles
Peipei Maa, Chunhui Liuab?(), Ziyao Mab, Lihua Zhanab, Minghui Huangab
Received:
2018-04-30
Accepted:
2018-08-29
Online:
2019-05-10
Published:
2019-02-20
Contact:
Liu Chunhui
About author:
1 These authors contribute equally to this paper.
Peipei Ma, Chunhui Liu, Ziyao Ma, Lihua Zhan, Minghui Huang. Formation of a new intermediate phase and its evolution toward θ' during aging of pre-deformed Al-Cu alloys[J]. J. Mater. Sci. Technol., 2019, 35(5): 885-890.
Fig. 2 HAADF-STEM images showing the typical microstructure in the alloy aged at 165 ℃ for 9?h: (a) without pre-deformation; (b) overall mixed-precipitates morphology in pre-deformed sample; (c-g) high resolution images of the large precipitates marked by the arrows P1-P4, respectively, in (a); (e) a magnified image of the lower tip of P2. The electron beam is parallel to [001]Al direction.
Fig. 3 Atomic-resolution HAADF-STEM images of (a) pre-θ′-2 and (b) 1.5 cθ′ thick θ′. The yellow arrow points to an enlarged part of the precipitate indicated by the solid-line box. The atomic model and the simulated image are overlaid on the experimental image. Inset with dashed-line box shows a HAADF-STEM image reported in ref. [18] of the complex hetero-phase θ′′+ θt′ at the semi-coherent interface (rim region) between Al matrix and θ′ phase. A 1-nm-wide region of θ′′ is present at the rim area of each precipitate. The arrow at the rim interface represents a dislocation with Burgers vector (aAl/2) [100]. The electron beam is parallel to [001]Al direction.
Fig. 5 Formation energy per Cu atom compared to Cu in solid solution of different precipitate structures appearing in Al-Cu alloy with pre-deformation. The energy of a pre-θ'-2 was set as the zero energy.
Fig. 6 TEM images showing the precipitates and dislocations in the pre-deformed Al-Cu alloy after ageing. The large precipitates normally exist near or at irregular dislocation segments marked by the arrows.
Fig. 7 HAADF-STEM images showing the typical microstructure in the pre-deformed high-purity Al-Cu alloy aged at 165 ℃ for 9?h: (a) overall mixed-precipitates morphology; (b-d) high resolution images of the large precipitates marked by the arrows P1-P3, respectively, in (a). The electron beam is parallel to [001]Al direction.
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