Modelling of heterogeneous precipitate distribution evolution during friction stir welding process

Kamp, N.; Sullivan, A. M.; Tomasi, Raphaël F.-X.; Robson, James

doi:10.1016/j.actamat.2005.12.024

Cited by 103 publications

(107 citation statements)

References 23 publications

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“…In the KW type model the evaluation of the nucleation rate of the precipitates is based on the classical nucleation theory [34], which is valid for the binary alloys and generally not considered strictly applicable for multi-component alloys [35]. In the model this is overcome by assuming the alloy is pseudo-binary (nucleation and growth of the precipitates is controlled by the diffusion of copper).…”

Section: Nucleation Of S Phasementioning

confidence: 99%

“…The equations (4) and (7) represent an approximation (ignoring the Zeldovitch factor [38]) that has been applied in previous works [2,5,9,10] with some success, but it can be refined further to take into account more detailed theories of the atomic attachment rate and the Zeldovich factor [3,4,35]. In the KW model the nucleated precipitates can only grow if their size is greater than the critical size [3,19,].…”

Section: Nucleation Of S Phasementioning

confidence: 99%

“…v N is the number of the nucleation sites per unit volume estimated as the number of solute atoms per unit volume [10,36] and * r is the critical size which is evaluated by the Gibbs-Thompson relationship [6]. The formulation of the Gibbs-Thompson often used is given by [10,33,35]:…”

Section: Nucleation Of S Phasementioning

confidence: 99%

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

Khan

Starink

Yan

2008

Materials Science and Engineering: A

129

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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: Nucleation Of S Phasementioning

confidence: 99%

Section: Nucleation Of S Phasementioning

confidence: 99%

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

Khan

Starink

Yan

2008

Materials Science and Engineering: A

129

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“…Ligas de alumínio, por apresentarem as características desejadas, vem sendo objeto de pesquisa [1][2][3][4][5][6][7][8][9], em especial ligas de alumínio-lítio [10][11][12], que mantém essas características mesmo em baixas temperaturas. A adição de 1% em peso de Lítio gera, aproximadamente, uma redução de 3% na densidade da liga, além de aumentar o módulo elástico em cerca de 6% [13].…”

Section: Ivan Moroz Nelson Guedes De Alcântara Jorge Fernandes Dos unclassified

“…A variação microestrutural decorrente do processo de FSW em ligas de alumínio tem sido amplamente descrita na literatura [1,4,7,8,11,15]. De forma geral, a região da lente de soldagem (nugget), mostrada na Figura 5C, tem microestrutura de grãos equiaxiais, de dimensões refinadas (da ordem de alguns micrômetros), formados por recristalização devido ao efeito conjunto, nessa região em particular, de altas deformações e temperaturas [15].…”

Section: Metalografiaunclassified