Precipitation strengthening at ambient and elevated temperatures of heat-treatable Al(Sc) alloys

Seidman, David N.; Marquis, Emmanuelle A.; Dunand, David C.

doi:10.1016/s1359-6454(02)00201-x

Cited by 697 publications

(240 citation statements)

References 30 publications

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“…Precipitation strengthening from the 2 to 20 nm particles was estimated using the particle parameters measured with TEM (Table I) and the order strengthening relationship, [46] which assumes the dislocation cutting of relatively small coherent particles observed in this steel previously: [31] …”

Section: Effect Of Strengthening Mechanisms On the Yield Stressmentioning

confidence: 99%

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

Kostryzhev

Marenych

Killmore³

et al. 2015

Metall Mater Trans A

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The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075 °C to 825 °C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly. The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075°C to 825°C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly.

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Section: Effect Of Strengthening Mechanisms On the Yield Stressmentioning

confidence: 99%

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

Kostryzhev

Marenych

Killmore³

et al. 2015

Metall Mater Trans A

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“…The strengthening by the shearable co-clusters may, in principle, be due to mechanisms such as order strengthening, stacking fault strengthening, chemical strengthening or modulus strengthening [20,42]. In 2024 Al-Cu-Mg alloys the co-cluster strengthening can be described well by modulus strengthening mechanism [29,43].…”

Section: Co-cluster Strengtheningmentioning

confidence: 99%

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

Khan

Starink

Yan

2008

Materials Science and Engineering: A

128

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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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“…From these results, they concluded that the precipitate strengthening in the alloy was caused by inhibiting the recovery of the dislocation substructure, rather than by the resistance to the dislocation motion among the dispersed particles. In addition, Seidman et al 23) reported that, in an Al alloy containing coherent precipitate particles, the presence or absence of a subgrain structure depends on the size of precipitates when the minimum creep strain rate occurs. They considered that under conditions where no subgrain structure is formed, the pinning effect of dislocations due to precipitated particles becomes more efcient because the climbing motion of the dislocations to the particles is slowed.…”

Section: 4mentioning

confidence: 99%