Structure and Microstructure of Aluminum Alloys in As-Cast State

Glazoff, Michael V.; Khvan, A.; Zolotorevsky, Vadim S.; Белов, Н. А.; Dinsdale, Alan

doi:10.1016/b978-0-12-811805-4.00002-x

Cited by 6 publications

(28 citation statements)

References 42 publications

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“…It should be noted that the best metal forming processability was shown for Al-Ca-Mn alloys [14]. Moreover, Mn acts both as a eutectic-forming element and a solid-solution strengthening agent [1,15]. As for Al-Ca-Ni alloys, an appearance of the ternary Al9NiCa phase together with Al4Ca and Al3Ni phases was found in equilibrium with (Al) solid solution [9].…”

Section: Introductionmentioning

confidence: 95%

“…Currently, light materials with a given set of mechanical and physical properties are extremely in demand for manufacturing engineering parts [1][2][3]. Specifically, high-load pistons operated at up to 300 • C require not only specific mechanical properties (e.g., strength, hardness and ductility) but also low Coefficient of Thermal Expansion (CTE) and high thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, high-load pistons operated at up to 300 • C require not only specific mechanical properties (e.g., strength, hardness and ductility) but also low Coefficient of Thermal Expansion (CTE) and high thermal conductivity. Among numerous materials, hypereutectic Al-Si alloys (e.g., A390.0 and FM180 alloys), have been established due to acceptable performance in the aforementioned properties [1,4,5]. In reality, they are natural metal matrix composites (NMMC) consisting of hard (Si) crystals distributed throughout a eutectic matrix.…”

Section: Introductionmentioning

confidence: 99%

“…In reality, they are natural metal matrix composites (NMMC) consisting of hard (Si) crystals distributed throughout a eutectic matrix. However, they show some pivotal drawbacks such as brittleness and the need for modification operation for refining primary and eutectic (Si) phase [1,5].…”

Section: Introductionmentioning

confidence: 99%

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Hypereutectic Al-Ca-Mn-(Ni) Alloys as Natural Eutectic Composites

Наумова

Doroshenko

Barykin

et al. 2021

Metals

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In the present paper, Natural Metal-Matrix Composites (NMMC) based on multicomponent hypereutectic Al-Ca-(Mn)-(Ni) alloys were studied in as-cast, annealed and rolled conditions. Thermo-Calc software and microstructural observations were utilised for analysing the equilibrium and actual phase composition of the alloys including correction of the Al-Ca-Mn system liquidus projection and the solid phase distribution in the Al-Ca-Mn-Ni system. A previously unknown Al10CaMn2 was discovered by both electron microprobe analysis and X-ray studies. The Al-6Ca-3Mn, Al-8Ca-2Mn, Al-8Ca-2Mn-1Ni alloys with representative NMMC structure included ultrafine Сa-rich eutectic and various small-sized primary crystals were found to have excellent feasibility of rolling as compared to its hypereutectic Al-Si counterpart. What is more, Al-Ca alloys showed comparable Coefficient of Thermal Expansion values due to enormous volume fraction of Al-based eutectic and primary intermetallics. Analysis of tensile samples’ fracture surfaces revealed that primary intermetallics may act either as stress raisers or malleable particles depending on their stiffness under deformation. It is shown that a compact morphology can be achieved by conventional casting without using any refining agents. Novel hypereutectic Al-Ca NMMC materials solidifying with the formation of Al10Mn2Ca primary compound have the best ductility and strength. We reasonably propose these materials for high-load pistons.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hypereutectic Al-Ca-Mn-(Ni) Alloys as Natural Eutectic Composites

Наумова

Doroshenko

Barykin

et al. 2021

Metals

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“…Today, aluminum and its alloys are used in different areas of manufacturing and technology (e.g., automotive and aerospace) [1]. Modern industries have been aggressively pushing the limits of aluminum alloys in strength, damage tolerance and corrosion resistance fronts to develop strong and tough aluminum alloys for various parts to increase the overall efficiency [2,3].…”

Section: Introductionmentioning

confidence: 99%

A New Approach in Surface Modification and Surface Hardening of Aluminum Alloys Using Friction Stir Process: Cu-Reinforced AA5083

2020

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In the current study, a new approach for surface modification and surface hardening of aluminum alloys is developed. The method is based on the logic of in-situ reinforcing FSP strategies. The novelty of the proposed process is the application of a bulk reinforcing metallic material instead of metallic powders. The FSP was carried out on aluminum alloy AA5083—thick plates. A thin sheet of pure copper (cross-section 4 × 0.8 mm2) was placed in a machined groove on the upper surface of the aluminum plate, and both materials were FSPed together. Samples with one, two and three FSP passes were manufactured respectively. Results indicate that the copper thin sheet was successfully integrated in the AA5083 stir zone. By increasing the FSP passes, almost all copper was integrated in the stir zone, mainly in the form of coper-based micron-sized intermetallic particles, and secondly, by copper diffusion in the AA5083 matrix. Due to the presence of complex intermetallic compounds created by the high heat input and intense plastic deformation, the hardness inside the stir-zone was found highly increased from 77 to 138 HV.

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