Effect of Cu content on precipitation and age-hardening behavior in Al-Mg-Si-xCu alloys

Qiao, Xiao; Liu, Huiqun; Yi, Danqing; Yin, Dong; Chen, Yuqiang; Zhang, Ying; Wang, Bin

doi:10.1016/j.jallcom.2016.10.221

Cited by 89 publications

(36 citation statements)

References 27 publications

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“…The needle-like β" precipitate is coherent with α-Al matrix, as reported by Yang et al (2012Yang et al ( , 2014. The lath shaped Q' and plate shaped θ' precipitates are semi--coherent with the α-Al matrix, as reported by Xiao et al (2017). These precipitates could provide excellent precipitation strengthening effect, which ensures the peak strengthening of the alloy, and contributes to the high yield strength of above 305 MPa for the alloy after heattreatment.…”

Section: Enhancement Of Mechanical Propertiessupporting

confidence: 51%

High performance gravity cast Al9Si0.45Mg0.4Cu alloy inoculated with AlB 2 and TiB 2

Dong

Zhang

Amirkhanlou

et al. 2018

Journal of Materials Processing Technology

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The primary α-Al grain size was 540 ± 110 μm in the Al9Si0.45Mg0.4Cu alloy refined by conventional Al5Ti1B master alloy, and that was 340 ± 80 μm in the Al3Ti3B refined alloy. The yield strength, tensile strength and elongation of the T6 heat-treated alloy refined by Al3Ti3B were 320 ± 2 MPa, 375 ± 10 MPa and 6.0 ± 1.0% respectively, which were increased by 3%, 4% and 50% in comparison with the alloy refined by Al5Ti1B. β", Q' and θ' precipitates were verified for peak strengthening of the heat-treated alloys. The majority of precipitates were β" and Q', while the minority was θ'. The volume of porosity was decreased by 50% in the Al3Ti3B refined alloy comparing with the Al5Ti1B refined alloy. The inoculation of AlB2 along with TiB2 results in the better grain refinement under Al3Ti3B, which contributes to the enhancement of yield strength and reduction of porosity. The improvement of tensile strength and ductility in Al3Ti3B refined alloy is attributed to the decrease of the size and area fraction of porosity on the fracture surface.

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Section: Enhancement Of Mechanical Propertiessupporting

confidence: 51%

High performance gravity cast Al9Si0.45Mg0.4Cu alloy inoculated with AlB 2 and TiB 2

Dong

Zhang

Amirkhanlou

et al. 2018

Journal of Materials Processing Technology

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“…The peak strength of the Al-Mg-Si alloy is known to be caused by the dispersion of β” phase, which can be changed by addition of Mg and/or Si, as well as other elements 6 , 15 – 17 , 29 .…”

Section: Introductionmentioning

confidence: 99%

“…In particular, addition of Cu to the Al-Mg-Si alloys shows large enhancement of the age-hardening kinetics and improvement of the peak hardness, and have been widely applicable for the industrial applications owing to their good mechanical properties compared with the one without Cu 15 – 17 . The cause of these phenomena have been considered as the change of precipitation sequences as 29 – 35 : …”

Section: Introductionmentioning

confidence: 99%

Structural and compositional study of precipitates in under-aged Cu-added Al-Mg-Si alloy

Maeda

Kaneko

Namba

et al. 2018

Sci Rep

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Atomic scale characterization of fine precipitates in an under-aged Cu added Al-Mg-Si alloy was carried out by combination of atomically-resolved annular dark-field scanning transmission electron microscopy and energy dispersive X-ray spectroscopy. Two types of precipitates were observed in the alloy. In the case of ordered β” precipitates, β” was proposed as Mg5-xAl2+xSi4 (x ≈ 1) with solute Cu atoms replacing Al site of β” precipitate. In the case of disordered precipitates, the precipitates were found to consist of β” sub-unit cells, three-fold symmetric structure without Cu atoms, Cu containing structures termed as “Cu sub-unit cluster”, and Q’ sub-unit cells. Among these structures, the morphologies of three-fold symmetric structure without Cu atoms, Cu sub-unit cluster, and Q’ sub-unit cell were almost the same, so that these structures should be the clusters of Q’ phase. Since the areal density, length and diameter of precipitates were almost equal between Cu free Al-Mg-Si alloy and Cu added Al-Mg-Si alloy, the increase of hardness by Cu addition should be due to the precipitation of Cu related precipitates, such as Cu sub-unit clusters and Q’ sub-unit cells.

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“…For the AlSi7Cu3.5Mg0.15 (Mn, Zr, V) alloy, two other kinds of precipitates can be observed: Dark rounded ones, identified as Al3(Zr, V, Ti) dispersoids, and small dark dots of β′′ or Q′ (globular, needles). They were identified with the help of EDS analysis and literature data [6][7][8]. These identifications are detailed in Figure 8a.…”

Section: Tem Precipitate Observationsmentioning

confidence: 99%

“…Quaternary Al-Si-Cu-Mg alloys show an impressive complexity in their own precipitation sequence due to the combination of the concomitant sequences and the formation of the Q (Al-Si-Cu-Mg) phase and its precursors. Different studies have shown the effect of composition ratios in such alloys to explain the nature of hardening precipitates and the conditions under which they are formed [6][7][8][9][10]. Furthermore, Q phase precursors present a vast topic in literature due to their sophisticated structure [11].…”

Section: Introductionmentioning

confidence: 99%

Precipitation Kinetics and Evaluation of the Interfacial Mobility of Precipitates in an AlSi7Cu3.5Mg0.15 Cast Alloy with Zr and V Additions

Heugue

Larouche

Breton

et al. 2019

Metals

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Recent environmental restrictions constrained car manufacturers to promote cast aluminum alloys working at high temperatures (180 °C–300 °C). The development of new alloys permits the fabrication of higher-strength components in engine downsizing. Those technologies increase internal loadings and specific power and stretch current materials to their limits. Transition metals in aluminum alloys are good candidates to improve physical, mechanical, and thermodynamic properties with the aim of increasing service life of parts. This study is focused on the modified AlSi7Cu3.5Mg0.15 alloy where Mn, Zr, and V have been added as alloying elements for high-temperature applications. The characterization of the cast alloy in this study helps to evaluate and understand its performance according to their physical state: As-cast, as-quenched, or artificially aged. The precipitation kinetics of the AlSi7Cu3.5Mg0.15 (Mn, Zr, V) alloy has been characterized by differential scanning calorimetry (DSC), transmission electron microscopy (TEM) observations, and micro-hardness testing. The Kissinger analysis was applied to extract activation energies from non-isothermal DSC runs conducted at different stationary heating rates. Finally, first-order evaluations of the interfacial mobility of precipitates were obtained.

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Effect of Cu content on precipitation and age-hardening behavior in Al-Mg-Si-xCu alloys

Cited by 89 publications

References 27 publications

High performance gravity cast Al9Si0.45Mg0.4Cu alloy inoculated with AlB 2 and TiB 2

High performance gravity cast Al9Si0.45Mg0.4Cu alloy inoculated with AlB 2 and TiB 2

Structural and compositional study of precipitates in under-aged Cu-added Al-Mg-Si alloy

Precipitation Kinetics and Evaluation of the Interfacial Mobility of Precipitates in an AlSi7Cu3.5Mg0.15 Cast Alloy with Zr and V Additions

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