Effects of Cu content on microstructure and mechanical properties of Al–14.5Si–0.5Mg alloy

Wu, Chih Ting; Lee, Sheng Long; Hsieh, Ming Che; Lin, Jiaping

doi:10.1016/j.matchar.2010.06.022

Cited by 26 publications

(6 citation statements)

References 17 publications

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“…As shown in Fig. 3, the first and the second exothermic peaks in the DSC traces of the as quenched alloy correspond to the λ ′ precipitates (Al 5 Cu 2 Mg 8 Si 6 ) and θ′ precipitates (Al 2 Cu) respectively6,14,15 These metastable λ ′ and θ′ precipitates cannot withstand high temperature of 300°C during isothermal heat treatment, which leads to a severe precipitate coarsening. The tiny white precipitates shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effects of T6 heat treatment on thermal stability and wear behaviour of Al–12·5Si–4·5Cu–1·0Mg alloy

Lee

et al. 2012

Materials Science and Technology

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The present study elucidates how T6 heat treatment affects thermal stability and wear behaviour of Al–12·5Si–4·5Cu–1·0Mg alloy. The experimental alloys under as cast and T6 heat treated conditions were isothermally heat treated at 300°C for 100 h to investigate thermal stability and wear behaviour. Owing to the precipitation of a large amount of λ′ (Al5Cu2Mg8Si6) and θ′ (Al2Cu) phases, T6 heat treated alloy showed the highest hardness before isothermal heat treatment. The coarsening of λ′ and θ′ phases led to a large decrease in hardness following isothermal heat treatment. The thermal stability of the T6 heat treated alloy was much worse than that of the as cast alloy. For wear behaviour, the as cast and T6 heat treated alloys showed the same wear rate with 10 N load after isothermal heat treatment, which indicated that the wear rates of Al–12·5Si–4·5Cu–1·0Mg alloys were independent on T6 heat treatment. Under 40 N load, the wear resistance of as cast alloy was superior to that of T6 heat treated alloy after isothermal heat treatment.

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Section: Resultsmentioning

confidence: 99%

Effects of T6 heat treatment on thermal stability and wear behaviour of Al–12·5Si–4·5Cu–1·0Mg alloy

Lee

et al. 2012

Materials Science and Technology

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“…The growth and coarsening of precipitates reduce the number of solute atoms in the matrix and release the strain fields around those precipitates, which results in a continuous increase in the electrical conductivity during the aging heat treatment (Ref 19,20). The electrical conductivity of alloys A and B (Zr-containing) under as-quenched (C q ), T6 heat-treated (C T6 ) and thermal exposure (C 100 ) conditions are listed in Table 3.…”

Section: Electrical Conductivity Measurementmentioning

confidence: 99%

Microstructure and Thermal Stability of A357 Alloy With and Without the Addition of Zr

Tzeng

Chengn

Nieh

et al. 2017

J. of Materi Eng and Perform

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The principal purpose of this research was to evaluate the effects of Zr on the microstructure and thermal stability of an A357 alloy that has been subjected to an aging treatment (T6) and thermal exposure (250 °C). The results show that the addition of Zr had a significant influence on the refinement of the grain size, which enhanced the hardness and tensile strength of the A357 alloy under the T6 condition. During thermal exposure at 250 °C, the rodlike metastable bÕ-Mg 2 Si precipitates transformed into coarse equilibrium phase b-Mg 2 Si precipitates, resulting in a significant drop in the hardness and tensile strength of the T6 heat-treated A357 alloy. However, after thermal exposure, coherent, finely dispersed Al 3 Zr precipitates were found to be formed in the T6 heat-treated A357 alloy. The addition of 0.1% Zr played a critical role in improving the high-temperature strength. Consequently, the A357 alloy with the addition of Zr demonstrated better mechanical properties at room temperature and high temperature than the alloy without Zr, in terms of both microstructure and thermal stability.

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“…Al-Mg 2 Si binary eutectic cells with regular morphologies have flake-like Mg 2 Si surrounded by α-Al. Wu et al [ 14 ] studied the effects of Cu on the microstructure and mechanical properties of Al-14.5Si-0.5Mg alloy, and it is reported that the Fe-containing phases in the alloy were β-Al 5 FeSi when the Cu content was 4.65% but were converted to Al 8 Mg 3 FeSi 6 with a Cu content of 0.52%. In a study of Al-7Si-3Cu-(0–0.92)Mg alloy, Aguilera-Luna et al [ 11 , 15 ] found the best modification effect of eutectic silicon particles and the smallest eutectic silicon size was achieved when the Mg content was 0.6% under the cooling rate of 4 °C/s.…”

Section: Introductionmentioning

confidence: 99%

Formation of Phases and Microstructures in Al-8Si Alloys with Different Mg Content

et al. 2021

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Mg-containing high-silicon aluminum alloy is a heat-treatable aluminum alloy that is now widely used in the aerospace and automotive industries because of its high specific strength, high wear resistance and corrosion resistance, low thermal expansion coefficient, and low cost. More attention has been paid to optimizing the microstructure to increase the performance of this type of aluminum alloy. In the present work, the solidification processes of Mg-free and Mg-containing (0.33–1.32%) Al-8Si alloys were analyzed by the experimental results combined with the thermodynamic calculation. The results showed that α-Al, Si, and Al5FeSi were in the Mg-free Al-8Si alloy ingots, while the Al5FeSi phases in alloys with Mg additions were transformed into π phases (Al8Mg3FeSi6) by the reaction L+Al5FeSi→α-Al+Si+Al8Mg3FeSi6. There was a binary eutectic reaction of L→α-Al+Al5FeSi when the Mg content exceeded 0.51% and the Fe content was higher than 0.17%. With the increase of Mg content, the volume of Mg2Si was gradually increased while the divorced eutectic phenomenon of the quaternary eutectic structure (α-Al+Si+Mg2Si+Al8Mg3FeSi6) was weakened and the eutectic structure was significantly refined.

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Effects of Cu content on microstructure and mechanical properties of Al–14.5Si–0.5Mg alloy

Cited by 26 publications

References 17 publications

Effects of T6 heat treatment on thermal stability and wear behaviour of Al–12·5Si–4·5Cu–1·0Mg alloy

Effects of T6 heat treatment on thermal stability and wear behaviour of Al–12·5Si–4·5Cu–1·0Mg alloy

Microstructure and Thermal Stability of A357 Alloy With and Without the Addition of Zr

Formation of Phases and Microstructures in Al-8Si Alloys with Different Mg Content

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