Effects of Cu content and Cu/Mg ratio on the microstructure and mechanical properties of Al–Si–Cu–Mg alloys

Yao, Zheng; Xiao, Wenlong; Ge, Sujing; Zhao, Wei; Hanada, Shuji; Ma, Chao

doi:10.1016/j.jallcom.2015.07.090

Cited by 114 publications

(39 citation statements)

References 31 publications

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“…These can be identified as θ' phase that forms fine platelets (thickness~1 nm) lying on {100} Al planes, as largely documented in literature for Al-Si-Cu-Mg alloys [35,45,46]. Moreover, the SAED pattern ( Figure 16a) shows reflections at {110} Al positions and sharp streaks parallel to the <001> Al direction: by comparing it with the SAED pattern analyses of thermal treated Al-Cu and Al-Si-Cu-based alloys reported in literature [47,48], it can be stated that the experimental diffraction pattern supports that the platelets are consistent with θ' phase. more rapid at higher temperature (200 °C ).…”

Section: Precipitation Microstructuresupporting

confidence: 73%

Effect of T6 Heat Treatment on the Microstructure and Hardness of Secondary AlSi9Cu3(Fe) Alloys Produced by Semi-Solid SEED Process

Fabrizi

Capuzzi

Mori

et al. 2018

Metals

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The effect of the T6 heat treatment on the microstructure and hardness of a secondary semi-solid AlSi9Cu3(Fe) alloy have been investigated by using optical, scanning and transmission electron microscopy and hardness testing. The semi-solid alloy was produced using the swirled enthalpy equilibration device (SEED). The solution heat treatments were performed at 450, 470 and 490 °C for 1 to 6 h followed by water quenching and artificial ageing at 160, 180 and 220 °C for holding times ranging from 1 to 30 h. The microstructural investigations have revealed the spheroidization of the eutectic Si and the dissolution of the majority of Cu-rich compounds after all the solution heat treatments; moreover, the greater the solution temperature and time, the higher the hardness of the alloy. Unacceptable surface blistering has been observed for severe solution condition, 490 °C for 3 and 6 h. The artificial ageing at 160 °C for 24 h has led to the highest alloy strengthening thanks to the precipitation of β” and Q’ (or L) phases within the α-Al matrix. The hardening peaks at higher temperatures have been early achieved due to faster hardening kinetic; however, the lower number density of β” and Q’ (or L) phases and the presence of coarser θ’ precipitates result in a reduction of hardness values for peak aged condition at 180 and 220 °C, respectively.

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Section: Precipitation Microstructuresupporting

confidence: 73%

Effect of T6 Heat Treatment on the Microstructure and Hardness of Secondary AlSi9Cu3(Fe) Alloys Produced by Semi-Solid SEED Process

Fabrizi

Capuzzi

Mori

et al. 2018

Metals

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“…Micro-cracks are easily generated in intermetallic compounds, because of the stress concentration [18]. The small size and the polygonal shape of intermetallic compounds are preferable for the microstructure and it is clearly indicated that the marked increase in mechanical properties in this study is induced by the modification of eutectic Mg2Si.…”

Section: The Tensile Strength Change Of Al-8zn-6si-4mg-2cu Alloys Witmentioning

confidence: 70%

Effect of Eutectic Mg2Si Phase Modification on the Mechanical Properties of Al-8Zn-6Si-4Mg-2Cu Cast Alloy

Kim

Jung

Hwang³

et al. 2019

Metals

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The modification effect of Al-5Ti-1B master alloy on eutectic Mg2Si in Al-Zn-Si-Mg system alloy was investigated in this study. The microstructure shows that an extreme effect can be achieved after the addition of Al-5Ti-1B master alloy into the base alloy. The morphology of eutectic Mg2Si changed from Chinese script to fine polygonal shape, and the size was refined from over 50 μm to under 10 μm. This morphology change is believed to be due to TiB2 particles existing in Al-5Ti-1B master alloy, and the presence of TiB2 particles inside the modified Mg2Si was confirmed by scanning electron microscope/energy dispersive spectrometer (SEM/EDS) observation. The mechanical properties were also improved by the addition of Al-5Ti-1B master alloys. This study investigated the reason for the improvement in mechanical properties with the modification of the microstructure.

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“…By controlling the Cu and the Cu/Mg ratio, the Al-6Si-2Cu-0.5Mg aged alloy with few primary compounds and a large number of fine Q-precipitates exhibits high strength and acceptable ductility. [9] The addition of Ni to the alloys from system Al-Si-Cu-Mg can improve the strength of the alloy by forming a δ-Al 3 CuNi phase. [10] However, the tendency to form porosity which leads to a reduction in strength of the alloys is increased with increasing content of Ni.…”

Section: J Min Metall Sect B-metall 53 (3) B (2017) 423 -428mentioning

confidence: 99%

The role of Zr and T6 heat treatment on microstructure evolution and hardness of AlSi9Cu3(Fe) diecasting alloy

Vončina

Kores

Ernecl

et al. 2017

J min metall B Metall

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The microstructure features and hardness of AlSi9Cu3(Fe) die casting alloy was investigated in the presence of Zr addition. The cast alloys were undergone the solutionizing treatment 2 h at 500 °C followed by artificial aging at 180 °C for 5 h. Optical microscopy and electron micro-analyzer were used to study the formation of different intermetallic phases. The hardness was tested for all samples at 25 °C. The results revealed that the intermetallic phase, based on (Al,Si)(Zr,Ti), forms when Zr is added in the investigated alloy, while the T6 heat treatment does not influence on the formation of Zr-bearing phase. Results also indicate that the hardness slightly increases in the AlSi9Cu3 alloy in as-cast state when Zr is added, while after T6 heat treatment increases by 50 % in the alloy without Zr and by 61 % in the alloy with Zr addition.

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Effects of Cu content and Cu/Mg ratio on the microstructure and mechanical properties of Al–Si–Cu–Mg alloys

Cited by 114 publications

References 31 publications

Effect of T6 Heat Treatment on the Microstructure and Hardness of Secondary AlSi9Cu3(Fe) Alloys Produced by Semi-Solid SEED Process

Effect of T6 Heat Treatment on the Microstructure and Hardness of Secondary AlSi9Cu3(Fe) Alloys Produced by Semi-Solid SEED Process

Effect of Eutectic Mg2Si Phase Modification on the Mechanical Properties of Al-8Zn-6Si-4Mg-2Cu Cast Alloy

The role of Zr and T6 heat treatment on microstructure evolution and hardness of AlSi9Cu3(Fe) diecasting alloy

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