The Heat Treatment of Rheo-High Pressure Die Cast Al-Cu-Mg-Ag Alloy 2139

Möller, Heinrich; Govender, Gonasagren

doi:10.4028/www.scientific.net/ssp.192-193.173

Cited by 10 publications

(17 citation statements)

References 13 publications

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“…Peak 2 had an onset temperature between 489 and 501°C, while peak 3 had an onset temperature of 494-508°C. These peaks possibly correspond to the phases with lower melting temperatures compared to Al 2 Cu, with onset temperatures between * 495 and * 513°C relating to AlCuMg compounds (S-Al 2 CuMg and Q-Al 7-Cu 3 Mg 6 ), reported in scholars [16,17,34]. Although these phases could not be identified using microscopic characterisation tools, DSC curve revealed their attendance.…”

Section: Alloysmentioning

confidence: 93%

“…In previous studies on Al-Cu-Mg and Al-Cu-Mg-Ag alloys [16,17,20,29], Mg level between 0.4 and 1.0 was typically used, while Cu/Mg was in the range 3-10. It was reported that increasing Mg content up to 1 mass% improves the hardenability in Al-Cu-Mg-Ag alloys [20].…”

Section: Design Of the Alloysmentioning

confidence: 99%

“…Yet a reasonable fraction of 92-95% of the maximum solute level was obtained. However, complex solution treatments for similar alloys proposed in scholars, such as controlled heating [17] or multi-step solubilisation and homogenisation treatment [16], may assist in reaching solute levels closer to equilibrium values. DSC thermograms during heating for Al-Cu-Mg-Ag alloy with coarse microstructure in as-cast and solution-treated conditions (490°C for 5 h ?…”

Section: Alloysmentioning

confidence: 99%

“…The second step at a temperature above 515°C for 10 h is to dissolve the Al 2 Cu phase. Moller et al [16] instead proposed a two-step homogenisation/solution heat treatment: homogenisation at 490°C for 24 h, followed by a SHT at 520°C for 2 h, which successfully prevents the formation of incipient melting pores to a great extent in 2139 alloy. Daswa et al [17] suggested a mix of three-step SHT coupled with controlled heating for 2139 alloy: controlled heating from 400 to 513°C and holding at 513°C for 2 h and eventually heating to 525°C and holding for 16 h.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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: 93%

Section: Design Of the Alloysmentioning

confidence: 99%

Section: Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Zamani

Toschi

Morri

et al. 2019

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…As mentioned previously, rheological die casting process greatly improves the porosity defects as shown in Figure 5 . The dimensional variations and surface bubbling phenomena do not appear after the appropriate T6 heat treatment, for rheological die castings, and better comprehensive mechanical properties can be achieved [ 37 – 40 ]. The R-HPDC process has a bright prospect and the applications in the automotive industry might be further expanded.…”

Section: Discussionmentioning

confidence: 99%

R-HPDC Process with Forced Convection Mixing Device for Automotive Part of A380 Aluminum Alloy

Zhou

Kang

et al. 2014

Materials

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The continuing quest for cost-effective and complex shaped aluminum castings with fewer defects for applications in the automotive industries has aroused the interest in rheological high pressure die casting (R-HPDC). A new machine, forced convection mixing (FCM) device, based on the mechanical stirring and convection mixing theory for the preparation of semisolid slurry in convenience and functionality was proposed to produce the automotive shock absorber part by R-HPDC process. The effect of barrel temperature and rotational speed of the device on the grain size and morphology of semi-solid slurry were extensively studied. In addition, flow behavior and temperature field of the melt in the FCM process was investigated combining computational fluid dynamics simulation. The results indicate that the microstructure and pore defects at different locations of R-HPDC casting have been greatly improved. The vigorous fluid convection in FCM process has changed the temperature field and composition distribution of conventional solidification. Appropriately increasing the rotational speed can lead to a uniform temperature filed sooner. The lower barrel temperature leads to a larger uniform degree of supercooling of the melt that benefits the promotion of nucleation rate. Both of them contribute to the decrease of the grain size and the roundness of grain morphology.

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Multistage homogenization process of aluminum alloy 2618

Zhu

Peng

Liu

et al. 2020

Materialwissenschaft Werkst

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Single‐, two‐, and three‐stage homogenization treatments of heat‐resistant alloy 2618 were conducted in this study. Results reveal a low melting point Al2CuMg phase and high melting point Al2Cu phase in the as‐cast aluminum alloy 2618. After single‐stage homogenization at 495 °C for 10 h, the Al2CuMg phase dissolves completely, but the Al2Cu phase cannot be completely dissolved even once the homogenization time is prolonged to 18 h. After the alloy 2618 are homogenized using two stages: 495 °C for 10 h and 520 °C for 8 h, a portion of the Al2Cu phase remains in the alloy. The Al2Cu phase remains undissolved even after prolonged time. After the two‐stage homogenization treatment at 495 °C for 10 h and 540 °C for 5 h, the high melting point Al2Cu phase completely dissolves but overburn occurs. After the alloy 2618 are homogenized using three stages at 495 °C for 10 h, 520 °C for 5 h, and 540 °C for 3 h, the Al2Cu phase completely dissolves and no overburn is detected. The three‐stage homogenization treatment is an effective method for dissolving the high melting point Al2Cu phase in the alloy 2618 and increasing their overburn temperature and solid solution temperature.

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The Heat Treatment of Rheo-High Pressure Die Cast Al-Cu-Mg-Ag Alloy 2139

Cited by 10 publications

References 13 publications

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

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

R-HPDC Process with Forced Convection Mixing Device for Automotive Part of A380 Aluminum Alloy

Multistage homogenization process of aluminum alloy 2618

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