High resolution electron microscopy study of Guinier-Preston (GP1) zones in AlCu based alloys

Karlı́k, Miroslav; Jouffrey, B.

doi:10.1016/s1359-6454(97)00003-7

Cited by 67 publications

(29 citation statements)

References 27 publications

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“…I. zone in Cu-Al alloys. [8][9][10][11][12] In addition to Zone and the CSS state, a new metastable state between them was found in the present work. Figure 2 shows a bright field image and a high resolution electron micrograph of a 10 min-aged sample, together with a corresponding electron diffraction pattern with the incidence in the [100] direction.…”

Section: Resultssupporting

confidence: 61%

New Chemical Layered Structure in Ti-Cr Alloys

2002

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The new chemical layered structure, referred to as a chemical stripe structure, was found as a metastable state in the (bcc → hcp + C15) metastable phase separation in the Ti-Cr alloys. Note that a metastable separation is here defined as a separation characterized by a positive value of the second derivative of Gibbs free energy with respect to chemical composition. The experimental data showed that the layered structure had periodicity of 4 × d 002 , about 0.72 nm, and chemical ordering of Ti : Cr = 3 : 1, and that a lot of antiphase boundaries with phase shifts of π/2 and π were involved in the structure. The coherent length of the layered structure was estimated to be about 15 nm along the modulated direction. In addition to these features, it was found that the layered structure was formed from the local bct state as another metastable state, not directly from the zone structure consisting of one Cr layer. On the basis of these data, the physical origin of the formation of the chemical layered structure is also discussed.

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Section: Resultssupporting

confidence: 61%

New Chemical Layered Structure in Ti-Cr Alloys

2002

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“…Both the formation of these particles and their effect on mechanical properties have been widely studied and many details are now reasonably well understood. It is well-known that the GP zones in Al-Zn and Al-Zn-Mg alloys are three-dimensional, often spherical [1,2,[5][6][7][8], while those forming in Al-Cu are two-dimensional, plate-like [9][10][11][12]. In Al-Zn-Mg-Cu alloys, although there is evidence that Cu atoms are mostly built into Zn-and Mg-containing η and η phases [1,2,7,13,14], it is not entirely clear what types of GP zones are formed.…”

Section: Introductionmentioning

confidence: 99%

The effect of Cu on mechanical and precipitation properties of Al–Zn–Mg alloys

Chinh

Lendvai

Ping

et al. 2004

Journal of Alloys and Compounds

145

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“…The size of the GP zone is about 5 nm in length and 1.8 nm in width. Previous research on GP zones formed in AlMg-Si [ 14,15], Al-Zn-Mg [ 16,17] and Al-Cu [ 18] alloys reveals that these zones are small in size (several nm), and tend to cause a white-black contrast in the image due to the coherency misfit strain perpendicular to the zones. The inset Fast Fourier Transform (FFT) pattern of the image shows that, the diffraction spots are only due to Al matrix.…”

Section: Methodsmentioning

confidence: 98%

Precipitates in Long Term Aging Al 5083 Alloy

Yi¹,

Zhu²,

Cullen³

et al. 2014

Light Metals 2014

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Al 5083 alloy aged at 343 K (70 ) for 3-30 months was evaluated by high resolution transmission electron microscopy (HRTEM) results show that both thickness and continuity of phase formed at grain boundaries increase with time. GP zones are observed in Al 5083 aged at 343 K for 3 months for the first time. TEM results reveal that GP zones can form homogeneously with the help of vacancies as well as heterogeneously at dislocations near grain boundaries, and the mechanism are explained in detail. Mg 2 Si precipitate was found to form at the grain boundary and energy-dispersive X-ray spectroscopy (EDS) results reveal that a Mg, Si (atomic ratio 1:1) rich phase nucleates at the interface of Mg 2 Si-matrix. phase(Al 3 Mg 2 , hexagonal) is observed to form at grain boundaries of Al 5083 alloy aged at 343 K for 30 months. phase was found at the grain boundary of Al 5083 aged at 343 K for 12 months using EDS.

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High resolution electron microscopy study of Guinier-Preston (GP1) zones in AlCu based alloys

Cited by 67 publications

References 27 publications

New Chemical Layered Structure in Ti-Cr Alloys

New Chemical Layered Structure in Ti-Cr Alloys

The effect of Cu on mechanical and precipitation properties of Al–Zn–Mg alloys

Precipitates in Long Term Aging Al 5083 Alloy

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