Preparation of semi-solid AlSi7Mg alloy slurry

Zhao, Zhongxing; Mao, Wenwen

doi:10.1016/s1006-7191(08)60031-9

Cited by 12 publications

(9 citation statements)

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“…The semi-solid rolling process has also been used for processing steels [93], in which the fabricating slurry is combined with the continuously rolling process. Different steels including 60Si2Mn [94,95], 1Cr18Ni9Ti [94,96,97] and T12 [98] have been tried for semi-solid twin roll casting process.…”

Section: Semi-solid Twin Roll Castingmentioning

confidence: 99%

An Overview on the Process Development and the Formation of Non-Dendritic Microstructure in Semi-Solid Processing of Metallic Materials

Wang

Dong

2022

Crystals

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Semi-solid metal (SSM) processing has been an attractive method for manufacturing near-net-shape components with high integrity due to its distinct advantages over conventional forming technologies. SSM processing employs a mixture of solid phase and liquid metal slurries and/or non-dendritic feedstocks as starting materials for shaping. Since the original development from 1970s, a number of SSM processes have been developed for shaping components using the unique rheological and/or thixotropic properties of metal alloys in the semi-solid state, in which the globular solid particles of primary phase are dispersed into a liquid matrix. In this paper, the progress of the development of shaping technologies and the formation of non-dendritic microstructure in association with the scientific understanding of microstructural evolution of non-dendritic phase are reviewed, in which the emphasis includes the new development in rheomoulding, rheo-mixing, rheo/thixo-extrusion and semi-solid twin roll casting, on the top of traditional rheocasting, thixoforming and thixomoulding. The advanced microstructural control technologies and processing methods for different alloys are also compared. The mechanisms to form non-dendritic microstructures are summarised from the traditional understanding of mechanical shear/bending and dendrite multiplication to the spheroidal growth of primary phase under intensively forced convection. In particular, the formation of spheroidal multiple phases in eutectic alloys is summarised and discussed. The concluding remarks focus on the current challenges and developing trends of semi-solid processing.

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Section: Semi-solid Twin Roll Castingmentioning

confidence: 99%

An Overview on the Process Development and the Formation of Non-Dendritic Microstructure in Semi-Solid Processing of Metallic Materials

Wang

Dong

2022

Crystals

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“…The phase stability of ternary GaAsSb alloy was determined using the phase diagram in a regular solution model. Thus, to specify the miscible and the unstable composition of materials, we used the following set of thermodynamic quantities, which can be expressed as [15,16]…”

Section: Mathematical Approachmentioning

confidence: 99%

“…that the GaAsSb alloy over intermediate compositions has a stable phase at an average growth temperature and illustrates a large miscibility gap enclosed by the binodal line[15,16,22]. The miscibility gap disappears, and the homogenous random alloy is predicted over the critical temperature (Tc) for phase separation is about 1580 K at 55%Sb.…”

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confidence: 99%

Theoretical Approach to Study the Physical Properties of GaAsSb Alloy

Sharma

Gupta

Bhattarai

et al. 2021

Preprint

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The physical properties of GaAsSb alloy are studied using a numerical method for a wide range of antimony compositions and temperatures. In the study of the phase diagram, the binodal curve describes the limits of solid solubility. In contrast, the spinodal curve points to the equilibrium solubility limit called the miscibility gap. It signifies that the GaAsSb alloy over intermediate compositions has a stable phase at a normal growth temperature and illustrates a large miscibility gap enclosed by the binodal line. It has been observed that GaAsSb alloy exhibiting the mixing enthalpy of about 1.1 kcal/mole and corresponds to critical temperature Tc by 1580 K. Whereas, the rate at which Debye temperature decreasing along with crystallographic direction Λ by 3.88/%Sb, Σ by 2.85/%Sb, and Δ by 1.59/%Sb. Also, we calculated the specific heat of GaAsSb alloy (35%Sb) at room temperature 49.1076 J/mole K and thermal conductivity by considering the Umklapp processes the dominant scattering mechanism 2.9036 W/mK. We also calculated the threshold energy due to the non-parabolicity effect and seen monotonic variation in temperature-dependent intrinsic carrier concentration of the GaAsSb alloy. Thus, make the right choice for several applications, such as photodetectors, photodiodes, and solar cells, and so on.

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“…Semi-solid processing is a promising technology based on the thixotropic behavior of materials in semi-solid state, which takes place at temperatures between solidus and liquidus. The process depends on material behaving in a thixotropic way in semi-solid state [1][2][3][4] . The required spheroidal microstructure can be obtained by a number of routes, such as mechanical stirring 5,6 , electromagnetic stirring 7,8 .…”

Section: Introductionmentioning

confidence: 99%