Effect of solution heat treatment on the age hardening capacity of dendritic and globular AlSi7Mg0.6 alloys

Birol, Yücel

doi:10.3139/146.110293

Cited by 21 publications

(12 citation statements)

References 33 publications

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“…c) shows the internal microstructure of the powder after heat treatment at 385°C for 6 h. These micrographs reveal coarsening of both the dark and light contrasting phases at the dendrite boundaries, accompanied with a transition from the networked, script-like phase structure to a more spheroidized structure. Similar trends in microstructural evolution with heat treatment have been seen in other Al-Si-Mg alloys (Ref[48][49][50][51]…”

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confidence: 79%

Microstructure and Mechanical Property Evaluation of Aluminum F357 Powder for Cold Spray Applications

et al. 2021

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Cold spray (CS) is a solid-state additive manufacturing process that can create high-density, high-performance deposits for many applications. Aluminum alloys have been the target of recent CS research due to their excellent mechanical behavior when cold-sprayed. The introduction of new Al alloys to CS is of interest as unique properties may be achieved, especially when powder is heat-treated prior to deposition. In this study, three batches of Al F357 powder—a control as-atomized, heat-treated at 230 °C for 75 min and heat-treated at 385 °C for 6 h—were studied. Scanning electron microscopy revealed microstructural modifications after heat treatment in the powder and sprayed deposits. X-ray diffraction highlighted the presence of eutectic Si, Mg2Si and SiO2 in all specimens. Energy-dispersive spectroscopy showed the spheroidization of Si during the 385 °C heat treatment, with an increase in the fraction of Mg2Si during both treatments. Nanohardness and microhardness testing showed a decrease in hardness with thermal processing in both the powder and sprayed deposits. Tensile testing demonstrated ductile behavior from both heat-treated powders, but significantly higher strengths from the 230 °C treatment. These results suggest Al F357 may be used in CS when appropriate powder heat treatments are applied.

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confidence: 79%

Microstructure and Mechanical Property Evaluation of Aluminum F357 Powder for Cold Spray Applications

et al. 2021

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“…This result is significant as it shows that dendritic and globular A356 components respond similarly to heat treatment. The same conclusion was reached by Birol [21,22] recently, by comparing artificial aging curves of globular and dendritic A356/7. The lower % elongation to failure (%A 5 ) of the GDC caliper as compared to the SSM-HPDC calipers is noteworthy.…”

Section: Solution Treatment At 540supporting

confidence: 59%

Application of shortened heat treatment cycles on A356 automotive brake calipers with respective globular and dendritic microstructures

Möller

Govender

Stumpf

2010

Transactions of Nonferrous Metals Society of China

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Abstract:The conventional casting alloy A356 is probably one of the most popular alloys used for semi-solid metal (SSM) forming. This is due to its high fluidity and good "castability". This alloy can be heat treated alternatively to the T4, T5 or T6 temper conditions. Previous work by the authors has shown that shorter heat treatment cycles can be applied for SSM processed A356 rather than the more costly traditional cycles (that were originally developed for liquid cast dendritic A356). The previous work was performed on relatively small rectangular plates (4×80×100mm 3 ) that were cast in steel moulds with a 50 ton high pressure die casting (HPDC) machine. This work determined whether these short heat treatment cycles (T4, T5 and T6) can be applied successfully to a larger (and more complex) casting too. Since the automotive industry has many possible applications for SSM-HPDC parts, the newly developed heat treatment cycles, as well as the traditional heat treatment cycles, were applied to A356 brake calipers cast using a 630 ton HPDC machine. Vickers hardness measurements at a cross section of the brake calipers were performed, indicating that similar values can be obtained when using the significantly shorter heat treatment cycles. Finally, the typical tensile properties that can be obtained for SSM-HPDC A356 brake calipers are compared with those manufactured by gravity die casting. These results indicate that the differences in microstructures (globular or dendritic) do not have a noteworthy effect on the heat treatment response. This implies that the short heat treatment cycles originally developed for globular SSM-HPDC A356 castings can be successfully applied to dendritic liquid A356 castings too.

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“…However, a recent paper by the authors has shown that the heat treatment response and tensile mechanical properties of A356 automotive brake calipers are in fact not influenced by having a globular or dendritic microstructure [12]. The same conclusion was also reached by Birol [13,14].…”

Section: Introductionmentioning

confidence: 64%

The Influence of Prior Natural Aging on the Subsequent Artificial Aging Response of Aluminium Alloy A356 with Respective Globular and Dendritic Microstructures

Möller

Govender

Rossouw

et al. 2011

Advances in Materials Science and Engineering

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Alloy A356 is one of the most popular alloys used for semisolid metal forming. The heat treatment cycles that are currently applied to semisolid processed components are mostly those that are in use for dendritic casting alloys. The assumption has been made that these heat treatments are not necessarily the optimum treatments, as the difference in solidification history and microstructure of SSM processed components should be considered. The objective of this study is to determine whether dendritic A356 behaves in a similar way to globular A356 in terms of its response to artificial aging with or without prior natural aging. The results indicate that the differences in microstructures (globular or dendritic) do not have a noteworthy effect on the heat treatment response. It is also shown that strong linear correlations are found between T4 and T6 hardness and wt% Mg of A356, regardless of the casting technique used.

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Effect of solution heat treatment on the age hardening capacity of dendritic and globular AlSi7Mg0.6 alloys

Cited by 21 publications

References 33 publications

Microstructure and Mechanical Property Evaluation of Aluminum F357 Powder for Cold Spray Applications

Microstructure and Mechanical Property Evaluation of Aluminum F357 Powder for Cold Spray Applications

Application of shortened heat treatment cycles on A356 automotive brake calipers with respective globular and dendritic microstructures

The Influence of Prior Natural Aging on the Subsequent Artificial Aging Response of Aluminium Alloy A356 with Respective Globular and Dendritic Microstructures

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