Effects of Ag variations on the microstructures and mechanical properties of Al–Cu–Mg alloys at elevated temperatures

Bai, Song; Zhou, Xuanwei; Liu, Zhiyi; Xia, Peng; Li, Meng; Su-min, Zeng

doi:10.1016/j.msea.2014.05.065

Cited by 63 publications

(17 citation statements)

References 24 publications

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“…Bai et al [32] reported a conclusive improvement in thermal stability of X which precipitates once Ag level increased from 0.4 to 0.8 mass%. In another study, where a varied set of compositions was studied to optimise precipitation hardening, the addition of 0.6 mass% Ag to Al-5Cu-1Mg alloy yielded the highest peak of hardness after ageing among the other Ag levels [20].…”

Section: Alloysmentioning

confidence: 97%

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Optimisation of heat treatment of Al–Cu–(Mg–Ag) cast alloys

Zamani

Toschi

Morri

et al. 2019

J Therm Anal Calorim

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The optimisation of heat treatment parameters for Al-Cu-(Mg-Ag) cast alloys (2xxx) having different microstructural scales was investigated. Thermo-Calc software was used to design optimal alloy compositions. Differential scanning calorimetry (DSC), scanning electron microscopy and wavelength-dispersive spectroscopy technique were employed to determine proper solution heat treatment temperature and homogenisation time as well as incidence of incipient melting. Proper artificial ageing temperature for each alloy was identified using DSC analysis and hardness measurement. Microstructural scale had a pronounced influence on time and temperature required for complete dissolution of Al 2 Cu and homogenisation of Cu solute atoms in the a-Al matrix. Refined microstructure required only one-step solution treatment and relatively short solution treatment of 10 h to achieve dissolution and homogenisation, while coarser microstructures desired longer time. Addition of Mg to Al-Cu alloys promoted the formation of phases having a rather low melting temperature which demands multi-step solution treatment. Presence of Ag decreases the melting temperature of intermetallics (beside Al 2 Cu) and improvement in age-hardening response. Peak-aged temperature is primarily affected by the chemical composition rather than the microstructural scale.

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Section: Alloysmentioning

confidence: 97%

“…Al-4.3Cu). Evidence in the studies showed a range of 0.35-1.70 mass% Ag added to Al-Cu-Mg alloys to encourage X precipitation [20,[30][31][32]. Based on solidification simulation, Ag incorporation of 0.4-1.0 mass% into Al-4.3Cu-0.7Mg system changes neither any characteristic temperature of phases nor the fraction of phases (Table 3).…”

Section: Alloysmentioning

confidence: 99%

Optimisation of heat treatment of Al–Cu–(Mg–Ag) cast alloys

Zamani

Toschi

Morri

et al. 2019

J Therm Anal Calorim

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“…Many recent publications [1,7,8] have focused on investigating the evolution of microstructure and mechanical properties in these alloys.…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

Statistical Model for the Mechanical Properties of Al-Cu-Mg-Ag Alloys at High Temperatures

Al-Obaisi

El‐Danaf

Ragab

et al. 2017

Advances in Materials Science and Engineering

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Aluminum alloys for high-temperature applications have been the focus of many investigations lately. The main concern in such alloys is to maintain mechanical properties during operation at high temperatures. Grain coarsening and instability of precipitates could be the main reasons behind mechanical strength deterioration in these applications. Therefore, Al-Cu-Mg-Ag alloys were proposed for such conditions due to the high stability of Ω precipitates. Four different compositions of Al-Cu-Mg-Ag alloys, designed based on half-factorial design, were cast, homogenized, hot-rolled, and isothermally aged for different durations. The four alloys were tensile-tested at room temperature as well as at 190 and 250 ∘ C at a constant initial strain rate of 0.001 s −1 , in two aging conditions, namely, underaged and peak-aged. The alloys demonstrated good mechanical properties at both aging times. However, underaged conditions displayed better thermal stability. Statistical models, based on fractional factorial design of experiments, were constructed to relate the experiments output (yield strength and ultimate tensile strength) with the studied process parameters, namely, tensile testing temperature, aging time, and copper, magnesium, and silver contents. It was shown that the copper content had a great effect on mechanical properties. Also, more than 80% of the variation of the high-temperature data was explained through the generated statistical models.

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“…The temperature for the covering skin of supersonic aircraft can reach 150 • C in service and even reach 300 • C in some extreme cases, and then it is prone to creep fracture [3,4]. The Al-Cu-Mg-Ag alloy precipitates a fine and uniformly distributed plate-like Ω phase on the {111} planes of the matrix during the aging process, which can significantly enhance the mechanical properties and thermal stability of the alloy [5][6][7][8][9][10]. Compared to the materials, such as titanium alloys and metal matrix composites, the Al-Cu-Mg-Ag alloy has characteristics of good performance/price ratio [11].…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents

Peng

Wang

Yang

et al. 2021

Metals

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The creep behavior and microstructural evolution of three Al–Cu–Mg–Ag alloys with Cu content around its solid solubility limit in Al (5.65 wt %) were investigated at 180–240 °C and applied stress of 150–300 MPa. The creep resistance of aged alloy, which is mainly determined by the number density of Ω phase, is the best for 6.00 wt % Cu, better for 5.30 wt % Cu, and the worst for 5.65 wt % Cu. After solid-solution treatment, the lowest Cu content in the Al matrix for the alloy with 5.65 wt % Cu is observed due to the existence of more residual phases. It results in the lowest number density of Ω phase the following aging and poor creep resistance. Increasing temperature from 180 to 240 °C at the same stress (225 MPa), the steady creep rate of alloys increases by 225 times, which is apparently larger than that (26 times) for increasing stress from 225 to 300 MPa at the same temperature (180 °C). It indicates that the coarsening of the Ω phase with increasing temperature should be more serious than that with increasing stress. The creep mechanism of Al–Cu–Mg–Ag alloy can be attributed to the dislocation climb with the existence of threshold stress.

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Effects of Ag variations on the microstructures and mechanical properties of Al–Cu–Mg alloys at elevated temperatures

Cited by 63 publications

References 24 publications

Optimisation of heat treatment of Al–Cu–(Mg–Ag) cast alloys

Optimisation of heat treatment of Al–Cu–(Mg–Ag) cast alloys

Statistical Model for the Mechanical Properties of Al-Cu-Mg-Ag Alloys at High Temperatures

Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents

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