Excess vacancies and the nucleation of precipitates in aluminum-silicon alloys

Ozawa, Eiichi; Kimura, Hisamichi

doi:10.1016/0001-6160(70)90055-6

Cited by 123 publications

(33 citation statements)

References 10 publications

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“…It is well established that the decomposition kinetics during ageing (at least in the early stages) are strongly influenced by the concentration of quenched-in vacancies and vacancy-related defects, which in turn are determined mainly by the quench temperature, quench rate and alloy chemistry [52][53][54][55][56][57][58][59]. In general, ageing kinetics are increased by faster quenching rates or by quenching from higher temperatures.…”

Section: Other Considerationsmentioning

confidence: 99%

Improvements in quench factor modelling

Rometsch

Starink

Gregson

2003

Materials Science and Engineering: A

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In this contribution, the validity of a number of key quench factor analysis (QFA) assumptions is discussed. It is shown that the incorporation of a square-root dependency of yield strength on precipitate volume fraction provides a sounder physical basis for quench factor modelling. Peakaged strength/hardness prediction accuracies are not affected, but C-curve positions are. It is also demonstrated that transformation kinetics are described more correctly by a modified StarinkZahra equation than by a Johnson-Mehl-Avrami-Kolmogorov type equation, yielding better prediction accuracies when a physically realistic Avrami exponent of 1.5 or greater is used.Finally, a regular solution model is introduced to quantify the influence of the solute solubility temperature dependency on the minimum strength. These improvements are all implemented within the framework of classical QFA.

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Section: Other Considerationsmentioning

confidence: 99%

Improvements in quench factor modelling

Rometsch

Starink

Gregson

2003

Materials Science and Engineering: A

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“…This should result in a faster kinetics of clustering. So the increase of the temperature accelerates the formation of the precipitate which has a positive effect on the precipitation kinetics [7,8]. Fig.…”

Section: Methodsmentioning

confidence: 98%

The Effect of the Artificial Aging on the Precipitation Kinetic in the Al-Mg-Si Alloy

Hamdi¹,

Boumerzoug²

2016

JPSA

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In this study, the effect of the artificial aging on the kinetics of the precipitation processes in the Al-Mg-Si alloy was investigated by differential scanning calorimetry and hardness examinations. This investigation revealed that the artificial aging has a positive effect on the precipitation kinetic. The activation energy of the precipitation process was calculated using Kissinger model. The result of this study showed a change in hardness values and in the activation energy for all precipitated phases. The hardness has high values at the higher aging temperature. The activation energy of the metastable phase β″ is determined as 41.55, which indicates that the formation of this phase is uncomplicated during artificial aging.

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“…Needle precipitates along low-index directions are found in AI-Ge [22] and Al-Si [23] where one of the principal strains is zero and the volume change is large. As seen in the micrograph in Fig.…”

Section: Ai-ge and Al-simentioning

confidence: 99%