In Situ Study of Solidification Kinetics of Al–Cu and Al–Ce–Mg Alloys with Application of Neutron Diffraction

Stroh, Joshua; Davis, T. A.; McDougal, Alexandra; Sediako, D.

doi:10.1007/978-3-319-72284-9_138

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…These results, along with microstructure and hot tearing studies, demonstrated that grain refinement results in a more uniform distribution of Al2Cu along grain boundaries, easing eutectic feeding and reducing hot tearing [58]. Additionally, recent work on Al-Ce alloys has demonstrated the need for experimental verification, since simulated data was unable to satisfactorily predict the presence and/or reaction temperatures of some phases [59]. For Mg alloys, the growth of Mg17Al12 intermetallic was not detected by neutrons in a Mg-6 wt.% Al alloy but appeared when the Al concentration increased to 9 wt.% [60].…”

Section: 1-1 Introductionmentioning

confidence: 97%

Mechanisms of Improving the Thermal and Electrical Conductivity of Aluminum Alloy Cylinder Heads

Vandersluis¹

2023

Preprint

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<p>One of the major causes of premature failure in automotive cylinder heads is the accumulation of thermal stresses, due to their large internal temperature gradients in-service. To ensure mechanical integrity, engine operating temperatures are typically restricted. However, this response reduces fuel efficiency, which increases costs and carbon emissions. A more sustainable solution can involve enhancing alloy conductivity, which improves temperature uniformity in the heads. In aluminum alloys, solidification rate, silicon modification, and precipitation heat treatment have each been reported to influence conductivity. Yet, the mechanisms and interactions regarding these parameters were unclear in the literature. Accordingly, the objective of this dissertation was to provide an in-depth, systematic investigation of the individual and combined effects of these processes on the microstructure and conductivity of automotive 319 aluminum alloy.</p> <p>After performing a baseline characterization of commercial cylinder heads, permanent-mould castings were produced with a range of solidification rates and strontium contents. These castings were analyzed to establish the dominant microstructural factors affecting electron mobility in the as-cast condition. Then, samples were subjected to multiple combinations of solution, natural aging, artificial aging, and direct aging heat treatments, to elucidate the roles of the dissolution, spheroidization and precipitation transformations. Furthermore, this work was complimented by several innovative, state-of-the-art experiments, which were the first to analyze the kinetics of solidification, chemical modification, thermal expansion, dissolution, and precipitation in 319. As a result, this dissertation contributed numerous, novel and meaningful insights regarding heat transfer in aluminum alloys. This included elucidation of the independent, major impacts of porosity, silicon morphology, and the size, distribution and coherency of the aluminum-copper precipitates, despite insensitivity to the dendritic size. The appropriate combination of solidification rate, strontium content, and heat treatment was demonstrated to promote superior conductivity to what was possible through their individual variation. Given low-porosity castings, this research revealed the potential for approximately 40% improvements in thermal and electrical conductivity, compared to the strontium-free, as-cast condition. Overall, the extensive conductivity data generated in this research supports strategic and practical materials processing procedures, demonstrates opportunities for balancing high conductivity with mechanical integrity, and ensures enhanced component performance and environmental sustainability.</p>

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Section: 1-1 Introductionmentioning

confidence: 97%

Mechanisms of Improving the Thermal and Electrical Conductivity of Aluminum Alloy Cylinder Heads

Vandersluis¹

2023

Preprint

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“…Hence, various elements such as Cu, Si, Mg, Mn, Zn, Ca, and rare earth (RE) elements have been added to enhance the performance of Al alloys at high temperatures [11]. Recent studies have shown that the addition of RE elements can be particularly beneficial for improving the ambient as well as elevated temperature mechanical properties [9].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of suction-cast aluminium–cerium alloys

Gope

Mondol

Ganguly

et al. 2023

Materials Science and Technology

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In the present investigation, the microstructure and tensile properties of Al–12Ce, Al–12Ce–4Si, and Al–12Ce–4Si–0.4Mg alloys (wt-%), fabricated by suction-casting (SC) and gravity-casting (GC) were compared. The SC alloys exhibited finer grains and a higher number of precipitates than the GC alloys. Addition of Si and Mg in Al–12Ce alloy improved the hardness substantially. Incorporation of 4Si and 0.4Mg enhanced the yield and tensile stress but reduced ductility in the SC alloys. The SC Al-12Ce-4Si-0.4Mg alloy illustrated the best hardness and tensile strength. The fracture behaviour of the SC Al–12Ce alloy changed from quasi-cleavage to complete cleavage fracture following the addition of 4Si and 0.4Mg.

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In Situ Neutron Diffraction Solidification Analyses of Rare Earth Reinforced Hypoeutectic and Hypereutectic Aluminum–Silicon Alloys

Stroh

Sediako

Weiss

et al. 2020

The Minerals, Metals &Amp; Materials Series

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In Situ Study of Solidification Kinetics of Al–Cu and Al–Ce–Mg Alloys with Application of Neutron Diffraction

Cited by 4 publications

References 13 publications

Mechanisms of Improving the Thermal and Electrical Conductivity of Aluminum Alloy Cylinder Heads

Mechanisms of Improving the Thermal and Electrical Conductivity of Aluminum Alloy Cylinder Heads

Microstructure and mechanical properties of suction-cast aluminium–cerium alloys

In Situ Neutron Diffraction Solidification Analyses of Rare Earth Reinforced Hypoeutectic and Hypereutectic Aluminum–Silicon Alloys

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