Dispersoid strengthening of a high temperature Al–Si–Cu–Mg alloy via Mo addition

Farkoosh, Amir R.; Chen, X. Grant; Pekguleryuz, Mihriban

doi:10.1016/j.msea.2014.10.004

Cited by 130 publications

(94 citation statements)

References 46 publications

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“…1f). According to the SEM-EDS results and Al-Mo binary phase diagram [22], the primary Mo-containing intermetallic particles are identified as Al12Mo, as shown in Fig. 1e and 1f.…”

Section: Resultsmentioning

confidence: 97%

“…2a, no remarkable change occurred on primary Al12Mo particles, even after 600℃/24h. This can be attributed to the higher formation temperature of Al12Mo intermetallics based on the Al-Mo phase diagram, which is higher than 700°C [22]. Therefore, the Mo contents should be less than 0.35% to avoid the formation of primary Al12Mo particles from the microstructure view, which is stable and cannot be dissolved even at high temperature (~600 °C).…”

Section: Resultsmentioning

confidence: 99%

“…However, the yield strength at 315°C for the 6061 alloy is largely reduced to elevated-temperature mechanical properties. In addition, the distribution coefficient of Mo is calculated to be 2.5 [22,24], which is much higher than 1, indicating significant negative segregation during the solidification. Therefore, it provides the possibility to increase the volume fraction of dispersoids but also to reduce the volume fraction of DFZs in the center of dendrites.…”

Section: Introductionmentioning

confidence: 95%

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Enhanced elevated-temperature properties via Mo addition in Al-Mn-Mg 3004 alloy

Liu

Chen

2017

Journal of Alloys and Compounds

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The present work investigates the influence of adding Mo to an Al-Mn-Mg 3004 alloy on elevated-temperature properties as well as their thermal stability during longterm thermal holding at 350°C and 400°C. In as-cast and heat-treated conditions, both microhardness and yield strength increase with increasing Mo contents and reach peak values at 0.3 wt. % followed by a plateau. With an optimized Mo content (0.3 wt. %), the volume fraction of dispersoids is increased while the volume percentage of the dispersoid-free zone is greatly reduced compared to the base alloy free of Mo, resulting in the remarkable increases in elevated-temperature strength and creep resistance. The results of the long-term thermal holding show that compared with the rapid drop of elevated-temperature strength and creep resistance in the base alloy, the Al-Mn-Mg alloy with 0.3% Mo is thermally stable up to 350°C, exhibiting a slight decrease of stability at 400°C. The combination of high elevated-temperature properties and their excellent thermal stability at 350-400°C with Mo addition makes Al-Mn-Mg 3xxx alloys the promising candidates for elevated-temperature applications.

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“…1f). According to the SEM-EDS results and Al-Mo binary phase diagram [22], the primary Mo-containing intermetallic particles are identified as Al12Mo, as shown in Fig. 1e and 1f.…”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Enhanced elevated-temperature properties via Mo addition in Al-Mn-Mg 3004 alloy

Liu

Chen

2017

Journal of Alloys and Compounds

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“…However, the strength of traditional precipitation strengthening alloys, such as 2xxx, 6xxx and 7xxx alloys, can be seriously deteriorated due to the rapid coarsening of precipitates at elevated temperature (i.e., the overaging effect) [1,2]. Conversely, dispersoid strengthening is reported to be an important hardening mechanism at elevated temperature in aluminum alloys [3][4][5][6][7][8]. Therefore, developing low cost and thermally stable aluminum alloys with dispersoid precipitation that function well at elevated temperature is particularly attractive for these industries.…”

Section: Introductionmentioning

confidence: 99%

Development of Al–Mn–Mg 3004 alloy for applications at elevated temperature via dispersoid strengthening

2015

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In this study, the potential applications of Al-Mn-Mg 3004 alloy at elevated temperature have been evaluated through the systematic study of the precipitation behavior of α-Al(MnFe)Si dispersoids and their effect on material properties during precipitation treatment and long-term thermal holding. The results demonstrate a significant dispersion strengthening effect caused by the precipitation of fine uniformly distributed dispersoids during precipitation treatment. The peak compression yield strength (YS) at 300°C of the experimental 3004 alloy can reach as high as 78 MPa due to a large volume fraction (~2.95 vol. %) of α-Al(MnFe)Si dispersoids. The dispersoids are found to be thermally stable at 300°C for up to 1000 h of holding, leading to consistently high mechanical performance and creep resistance. The superior and stable YS and creep resistance at 300°C enables the 3004 alloy to be applied to weight-sensitive applications at elevated temperatures.

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“…It is reported that the coherent or semi coherent Al3M dispersoids can precipitate and thermal stable up to 250-350°C through the addition of transition and rare earth elements, such as individual or combined addition of Sc, Zr and Er [3][4][5][6] . However, the high cost of these elements limits their wide application.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Elevated-Temperature Strength and Creep Resistance during Multi-Step Heat Treatments in Al-Mn-Mg Alloy

Wang¹,

Liu²,

Wang³

2018

Preprint

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Abstract:Present work has systematically investigated the evolution of dispersoid and elevated-temperature properties including the strength and creep resistance during the various multi-step heat treatments in Al-Mn-Mg 3004 alloys. Results show that only α-Al(MnFe)Si dispersoid is observed in the studied temperature range (up to 625°C) and it coarsens with increasing temperature to 500°C but dissolves at 625°C. The evolution of elevated-temperature strength and creep resistance is greatly related to the temperature of each step during the multi-step heat treatments. Generally, lower temperature at the first-step heat treatment leads to higher properties while the properties decrease with increasing temperature of last-step heat treatment. Suitable models have been introduced to explain the evolution of strength and the creep threshold stress at elevated-temperature during the various heat treatments.

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Dispersoid strengthening of a high temperature Al–Si–Cu–Mg alloy via Mo addition

Cited by 130 publications

References 46 publications

Enhanced elevated-temperature properties via Mo addition in Al-Mn-Mg 3004 alloy

Enhanced elevated-temperature properties via Mo addition in Al-Mn-Mg 3004 alloy

Development of Al–Mn–Mg 3004 alloy for applications at elevated temperature via dispersoid strengthening

Evolution of Elevated-Temperature Strength and Creep Resistance during Multi-Step Heat Treatments in Al-Mn-Mg Alloy

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