Characterization of precipitates in a hot-deformed hypereutectic Al–Si alloy

He, Kun; Yu, Faquan; Zhao, Dewei; Zuo, Liang

doi:10.1016/j.jallcom.2012.06.051

Cited by 22 publications

(6 citation statements)

References 20 publications

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“…Based on the Al-Si system, Cu and Mg are commonly added as alloying elements to make these alloys heat treatable, and provide a way to enhance their mechanical properties by precipitation hardening. Normally, their mechanical properties are determined by the phase composition, morphology, distribution and size of precipitate formed during decomposition of the metastable supersaturated solid solution obtained by solution treatment and quenching [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of Cast Hyper-Eutectic Al-18% Si Alloy during Cyclic Semi-Solid Heat Treatment

Ramadan¹

2015

JMMCE

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The cyclic semi-solid heat treatment represents a promising technique for improving microstructure and mechanical properties of a wide range of metallic alloys. In the current research the influence of cyclic semi-solid heat treatment on microstructure of Al-18% Si alloy containing 0.8% Fe has been studied. All specimens were heated in an electrically heated resistance furnace with heating rate of 10˚C•min −1 to 585˚C. For a complete one cycle heat treatment (5 min heating time), samples after 5 min holding at 585˚C were cooled to a temperature of 550˚C in still air cooling and the samples were taken out immediately for water quenching. It was found that heat treatment cycles should be limited to 3 cycles or less in order to maintain fine grain size and globular structure without agglomeration and coalescence. Cyclic semi-solid heat treatment changes morphology of iron-rich intermetallics phases to be plate-like and fine plate iron-rich intermetallics phases, in stead of needle-like iron-rich intermetallics phases that are observed in as-cast samples. Cyclic heating shows a relatively higher hardness for all heating cycles compared with as-cast one due to its finer and globular structure. Cyclic semi-solid heat treatment technique results in lower coarsening rate constant compared with isothermal heat treatment one due to coarsening discontinuous effect.

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Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of Cast Hyper-Eutectic Al-18% Si Alloy during Cyclic Semi-Solid Heat Treatment

Ramadan¹

2015

JMMCE

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“…With the addition of Sr the primary Si particles size decreased and eutectic Si had granular structure. With the addition of P primary Si can be refined even to 32.8μm, and Sr addition mostly modifies eutectic Si [11].In [19] microstructure of as-cast (Al17.5Si)alloy shows fine primary Si particles, -aluminum dendrites, eutectic Si and complex intermetallic phases, and the microstructure was much finer than that of the commercial Al-Si alloy. After T6 treatment and aging at 150°C for 16h the -aluminum dendritic structure was eliminated.…”

Section: Microstructurementioning

confidence: 99%

Polymer matrix nanocomposites from the ecological aspect in the automotive industry

Miladinović

Gajević²,

Ivanović³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Demands of today’s automotive industry are increasing; there is a constant tendency of weight reduction and higher reliability of constructions. Pistons and piston liners for vehicles are mostly manufactured from aluminum-silicon alloys. With different manufacturing methods and/or the addition of some chemical elements, base alloy properties can be modified. Methods for hypereutectic aluminum alloys and composites manufacturing and their influence on material properties will be given in this paper. The influence of Si percentage in base alloy and how an addition of some chemical elements affects the properties of these materials will be observed as well.

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“…It was concluded that with addition of P and Sr there was refinement of Si particles and tensile strength was increased. In [19] the mechanical properties of hypereutectic Al17.5Si (Al-17.5Si-4.5Cu-1Zn-0.7Mg-0.5Ni) alloy were investigated. Specimens of hypereutectic alloy were hot deformed and aged for 4-16h at temperatures of 120, 150 and 180°C.…”

Section: Gravity Castingmentioning

confidence: 99%