Development of Axial Continuous Metal Expeller for melt conditioning of alloys

Cassinath, Zen; Rao, A.K. Prasada

doi:10.1088/1757-899x/114/1/012042

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…The ACME unit is designed to refine microstructure and distribute particles and various phases for enhanced mechanical and chemical properties. The ACME instrument, designed by Cassinath [20,21], comprises a shaft with several rotor blades, which is driven by a motor. Each stator is fixed into the walls of the barrel and sits in slots.…”

Section: Acme Unitmentioning

confidence: 99%

“…However, twin-screw is difficult to incorporate into casting processes mainly due to the size, compatibility and operational complexities. In order to overcome these challenges, new instruments have been devolved based on rotor-stator shearing mechanism [19]. In the present research, ACME (Axial Centrifugal Metal Expeller) [18,19] shearing device working on the same principle as the rotor-stator instrument is used.…”

Section: Introductionmentioning

confidence: 99%

“…In order to overcome these challenges, new instruments have been devolved based on rotor-stator shearing mechanism [19]. In the present research, ACME (Axial Centrifugal Metal Expeller) [18,19] shearing device working on the same principle as the rotor-stator instrument is used. The ACME device provides high-intensity shearing through blade and shaft design as well as adds flexibilities in terms of processing Metal Metrix Composite (MMC), pumping liquid etc.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing

Cassinath

Sridhar

et al. 2019

Materials Science and Technology

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Sn–20 wt-%Bi and immiscible Sn–20 wt-%Bi–1 wt-%Al alloys were used to understand the effect of high-intensity shearing on microstructural refinement. Novel ACME (Axial Centrifugal Metal Expeller) shearing device, based on axial compressor and rotor–stator mechanism to generate high shear rate and intense turbulence, was used to condition the melts prior to solidification. Microstructure in the Sn–Bi alloy deviated from dendritic grains with coarse eutectic pockets under conventional solidification to compact grains with well-dispersed eutectic under semisolid-state shearing. Decreasing the shearing temperature and increasing shearing time increased the globularity of grains. Following shearing, remnant liquid solidified into fine grain structure. In the immiscible Sn–Bi–Al alloy, shearing produced uniform dispersion of refined Al-rich particles in Sn-rich matrix as opposed to severe segregation under conventional solidification. The primary effect of shearing appears to originate from the thermo-solutal homogenisation of the melt and its effect on interface stability during solidification.

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Section: Acme Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing

Cassinath

Sridhar

et al. 2019

Materials Science and Technology

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“…The application of high shearing of liquid alloy to generate thixotropic structure through the nucleation of globular grains instead of dendritic ones during solidification could be an example of such an action. [74][75][76] Conventional methods of alloy treatments at semi-solid range are also under constant development, e.g. twin screw system for the generation of thixotropic structure by cooling of liquid alloy to semi-solid state with shearing and mixing suspension.…”

Section: Further Development Of Ssmmentioning

confidence: 99%

Critical assessment: Opportunities in developing semi-solid processing: Aluminium, magnesium, and high-temperature alloys

Rogal

2017

Materials Science and Technology

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Semi-solid metal processing (SSM) is a modern metal forming technology offering net-shape metal components of complex geometry in a one-step operation. The process relies on the thixotropic behaviour of metals with non-dendritic microstructures in a wide semi-solid temperature range. The beneficial effects are currently exploited in aluminium and magnesium alloys. This alternative manufacturing route to casting and forging has generated high expectations regarding high melting alloys, although no conclusive results have been achieved so far. Current studies focus on a deep understanding of the fundamental basics of alloys in the semisolid range, e.g. rheology, microstructural evolution, and the consequences of forming, e.g. relations between process parameters, microstructure, and properties. This critical assessment aims at defining the important needs for further development of SSM, and assessing current knowledge.

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Development of Axial Continuous Metal Expeller for melt conditioning of alloys

Cited by 2 publications

References 6 publications

Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing

Microstructural modification of Sn–Bi and Sn–Bi–Al immiscible alloys by shearing

Critical assessment: Opportunities in developing semi-solid processing: Aluminium, magnesium, and high-temperature alloys

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