A phenomenological constitutive model of Novel Rheo Gravity Die Cast Al-15Mg2Si-4.5Si-0.01Sr-0.015B composite

Pandey, DK and Das, P (2024) A phenomenological constitutive model of Novel Rheo Gravity Die Cast Al-15Mg2Si-4.5Si-0.01Sr-0.015B composite. In: Materials Today Communications, 38 .

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Abstract

The present study discusses the high temperature deformation behaviour as well as phenomenological constitutive model development of the novel Rheo gravity die cast (RGDC) Al-15Mg2Si-4.5Si-0.01 Sr-0.015B composite. Within the scope of the study, uniaxial isothermal compression tests are performed on the RGDC Al-15Mg2Si-4.5Si-0.01 Sr-0.015B composite, covering a range of strain rates from 10�3 to 10 s�1 and deformation temperatures spanning from 250 °C to 450 °C. Analysis using X-ray Diffraction (XRD), Energy dispersive spectroscopy (EDS) and Electron Probe Micro Analyzer (EPMA) revealed the presence of distinct phases within the material, including primary Al, Mg2Si, and elemental Si. The study employed three different constitutive models i.e., the Johnson-Cook (JC), modified Johnson-Cook (mJC), and sine hyperbolic Arrhenius (shA) types, to predict the flow stress of the material as a function of strain, strain rate, and deformation temperature. The results indicated that the sine hyperbolic Arrhenius type model and the modified Johnson Cook model effectively accounted the coupling effect of strain, strain rate, and deformation temperature, which affect the flow stress. Statistical analysis, specifically Pearson coefficient correlation (R), average absolute relative error (AARE) and standard deviations, established a reasonable agreement between the predicted flow stress values and the experimental flow stress data. Furthermore, it is observed that the sine hyperbolic Arrhenius type model exhibited superior accuracy compared to the modified Johnson Cook model, particularly at higher strain levels. © 2024

Item Type:	Journal Article
Publication:	Materials Today Communications
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to publisher
Keywords:	Compression testing; Constitutive models; Die casting; Energy dispersive spectroscopy; Morphology; Silicon; Strain rate, Al-15mg2si-4.5si-0.01sr-0.015b composite; Arrhenius; Constitutive modeling; Deformation temperatures; Die-cast; Johnson-Cook; Johnson-Cook model; Rheo gravity die casting; Strain deformation; Strain/strain rates, Plastic flow
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Mar 2024 04:22
Last Modified:	04 Mar 2024 04:22
URI:	https://eprints.iisc.ac.in/id/eprint/83888

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