Effect of melt overheating, cooling and solidification rates on Al–16wt.%Si alloy structure

Li, Peijie; Никитин, В. И.; Kandalova, E.G.; Никитин, К. В.

doi:10.1016/s0921-5093(01)01864-0

Cited by 94 publications

(37 citation statements)

References 4 publications

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“…This finding is not surprising and echoes those of a number of previous investigations [12][13][14][15]. Indeed it is noted that cooling rate alone can be sufficient for primary Si refinement in high pressure diecasting although in practice P additions are frequently used for complete control (if the me t sleeve and/or the flow prior to die filling is too slow then coarse primary Si may form before the melt enters the die cavity) [1].…”

Section: Discussionsupporting

confidence: 80%

Refinement of primary Si in hypereutectic Al-Si alloys by intensive melt shearing

Zhang¹,

Li²,

Stone³

et al. 2012

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

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Abstract. Hypereutectic Al-Si based alloys are gaining popularity for applications where a combination of light weight and high wear resistance is required. The high wear resistance arising from the hard primary Si particles comes at the price of extremely poor machine tool life. To minimize machining problems while exploiting outstanding wear resistance, the primary Si particles must be controlled to a uniform small size and uniform spatial distribution. The current industrial means of refining primary Si chemically by the addition of phosphorous suffers from a number of problems. In the present paper an alternative, physical means of refining primary Si by intensive shearing of the melt prior to casting is investigated. Al-15wt%Si alloy has been solidified under varying casting conditions (cooling rate) and the resulting microstructures have been studied using microscopy and quantitative image analysis. Primary Si particles were finer, more compact in shape and more numerous with increasing cooling rate. Intensive melt shearing led to greater refinement and more enhanced nucleation of primary Si than was achieved by adding phosphorous. The mechanism of enhanced nucleation is discussed.

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Section: Discussionsupporting

confidence: 80%

Refinement of primary Si in hypereutectic Al-Si alloys by intensive melt shearing

Zhang¹,

Li²,

Stone³

et al. 2012

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

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“…The microstructure of amorphous alloys is found to be much more homogeneous if precursor melts are much over-heated [20,21]. In order to refine solidified crystals, various techniques, like melt overheating and melt thermal treatment, have been explored and sometimes proved to be quite effective [22][23][24][25][26]. Although it is believed that the correlation between solidified microstructures and the melt thermal history would be attributed to different melt microstructures, the underlying nature and rules are unclear to date.…”

Section: Open Accessmentioning

confidence: 99%

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

2015

Metals

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Understanding the nature of liquid structures and properties remains an open problem for many fundamental and applied fields. It is well known that there is no other defined phase line above liquidus (TL) in phase diagrams of ordinary alloys. However, via resorts of internal friction, electric resistivity, thermal analysis, X-ray diffraction, solidification, etc., the results of our research on lots of single-and multiple-component melts show a novel physical image: temperature induced liquid-liquid structure transition (TI-LLST) can occur above TL. Moreover, the solidification behaviors and structures out of the melts that experienced TI-LLST are distinct from those out of the melts before TI-LLST. In this paper, some typical examples of TI-LLST and characteristic aspects of the TI-LLST are briefly reviewed, in which the main contents are limited in our own achievements, although other groups have also observed similar phenomena using different methods. In the sense of phenomenology, TI-LLST reported here is quite different from other recognized liquid transitions, i.e., there are only a few convincing cases of liquid P, Si, C, H2O, Al2O3-Y2O3, etc. in which the transition occurs, either induced by pressure or at a supercooled state and near liquidus.

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“…[1,8]) was done at one concentration in the similar way as the computations done for polyanionic clustering in liquid alloys [9].…”

Section: Introductionmentioning

confidence: 99%

Theoretical evaluation of structural and various associated properties of Al–Si melts

Mishra

Venkatesh

2008

Chemical Physics

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Effect of melt overheating, cooling and solidification rates on Al–16wt.%Si alloy structure

Cited by 94 publications

References 4 publications

Refinement of primary Si in hypereutectic Al-Si alloys by intensive melt shearing

Refinement of primary Si in hypereutectic Al-Si alloys by intensive melt shearing

Temperature-Induced Liquid-Liquid Transition in Metallic Melts: A Brief Review on the New Physical Phenomenon

Theoretical evaluation of structural and various associated properties of Al–Si melts

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