Role of vacancy–solute complex in the initial rapid age hardening in an Al–Cu–Mg alloy

Nagai, Yasuyoshi; Murayama, Mitsuhiro; Tang, Zheng; Nonaka, Takashi; Hara, Kazuhiro; Hasegawa, Masayuki

doi:10.1016/s1359-6454(00)00348-7

Cited by 163 publications

(78 citation statements)

References 21 publications

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“…[29]). This allows us to apply a simplified precipitation sequence in the present work, which permits formulation of precipitation kinetics and strengthening model with transparent predictions [8,29]: α ss → Cu:Mg co-clusters → S phase precipitates This precipitation sequence is consistent with the two stage strengthening observed in these alloys with the initial stage attributed to the strengthening by the Cu:Mg co-clusters and the later stage attributed to the strengthening by the S phase precipitates [8,31,32].…”

Section: Introductionsupporting

confidence: 69%

A model for precipitation kinetics and strengthening in Al–Cu–Mg alloys

Khan

Starink

Yan

2008

Materials Science and Engineering: A

121

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A physically-based numerical model is developed to predict the microstructural evolution and strengthening in Al-Cu-Mg alloys during isothermal treatments. The modelling of the formation kinetics of the precipitates is based on the Kampmann and Wagner model. The strengthening by the shearable Cu:Mg co-clusters is modelled on the basis of modulus strengthening mechanism and the strengthening by the non-shearable S phase precipitates is based on the Orowan looping mechanism. The model predictions are verified by comparing with the strength and differential isothermal calorimetery data on 2024-T351 aluminium alloys. The microstructural development and strength predictions of the model are generally in good agreement with the experimental data.

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Section: Introductionsupporting

confidence: 69%

A model for precipitation kinetics and strengthening in Al–Cu–Mg alloys

Khan

Starink

Yan

2008

Materials Science and Engineering: A

121

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“…The origin of the initial rapid hardening is still in dispute. Mechanisms cited for the rapid age hardening of Al-Cu-Mg alloys are formation of Guinier-Preston-Bagaryatsky (GPB) zones [1], Cu-Mg coclusters [2,3], a dislocation-solute interaction [4,5]. In the early work, the second stage of hardening was generally attributed to the formation of the S' or S phase [1].…”

Section: Introductionmentioning

confidence: 99%

Precipitation hardening in Al–Cu–Mg alloys revisited

2006

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Transmission electron microscopy, differential scanning calorimetry and hardness test have been used to study the precipitation sequence on artificial ageing of a stretched Al-Cu-Mg alloy.Two ageing temperatures at 190°C and 150°C for different times have been chosen. Some orthorhombic GPB2/S" is present in samples aged at 150°C for 48h, which is at the very start of the 2 nd stage of hardening. The combined experiments clearly show the second stage hardening is dominated by S phase, which forms a dense precipitation at the peak hardness stage, whilst no significant amounts of other phases or zones are detected.

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“…The use of CDB spectroscopy was extended to study the association of vacancies with solute atoms in metallic solid solutions only a few years ago, 4,5 but several CDB works regarding alloys have been published since then. 2,[6][7][8][9][10] CDB spectroscopy suit studying solute-vacancy complexes in Al alloys especially well because, as open-volume defects, they effectively trap positrons. Moreover, typical solute atoms, such as Cu, Zn, and Ag, have occupied d atom shells giving strong signals in the CDB momentum spectra in contrast to Al.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electron-positron momentum spectra of metallic alloys as supported by first-principles calculations

et al. 2007

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Electron-positron momentum distributions measured by the coincidence Doppler broadening method can be used in the chemical analysis of the annihilation environment, typically a vacancyimpurity complex in a solid. In the present work we study possibilities for a quantitative analysis, i.e., for distinguishing the average numbers of different atomic species around the defect. First-principles electronic structure calculations determining self-consistently electron and positron densities and ion positions are performed for vacancy-solute complexes in Al-Cu, Al-Mg-Cu, and Al-Mg-Cu-Ag alloys. The ensuing simulated coincidence Doppler broadening spectra are compared with measured ones for defect identification. A linear fitting procedure, which uses the spectra for positrons trapped at vacancies in pure constituent metals as components, has previously been employed to find the relative percentages of different atomic species around the vacancy [A. Somoza et al., Phys. Rev. B 65, 094107 (2002)]. We test the reliability of the procedure by the help of first-principles results for vacancy-solute complexes and vacancies in constituent metals.

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Role of vacancy–solute complex in the initial rapid age hardening in an Al–Cu–Mg alloy

Cited by 163 publications

References 21 publications

A model for precipitation kinetics and strengthening in Al–Cu–Mg alloys

A model for precipitation kinetics and strengthening in Al–Cu–Mg alloys

Precipitation hardening in Al–Cu–Mg alloys revisited

Analysis of electron-positron momentum spectra of metallic alloys as supported by first-principles calculations

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