High-Temperature Workability of Thixocast A356 Aluminum Alloy

Singh, Shailesh Kumar ; Chattopadhyay, K. ; Dutta, Pradip (2015) High-Temperature Workability of Thixocast A356 Aluminum Alloy Metallurgical and Materials Transactions A, 46 (7). pp. 3248-3259. ISSN 1073-5623

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Official URL: http://doi.org/10.1007/s11661-015-2855-y

Related URL: http://dx.doi.org/10.1007/s11661-015-2855-y

Abstract

The present work highlights the role of globular microstructure on the workability of A356 aluminum alloy at elevated temperature. The hot deformation behavior was studied by isothermal hot compression tests in the temperature range 573 K to 773 K (300 °C to 500 °C) and strain rate range of 0.001 to 10 s−1. The flow stress data obtained from the tests were used to estimate the strain rate sensitivity and strain rate hardening. Flow stress analysis of the alloy shows that the effect of temperature on strain hardening is more significant at lower strain levels and strain rate sensitivity is independent of strain. The results also reveal that the flowability of conventionally cast alloy increases after changing the dendritic microstructure into a globular structure through semisolid processing route. Thixocast alloy exhibits lower yield strength and higher elongation at elevated temperature in comparisons to conventionally cast values. This property has an important implication toward thixo-forming at an elevated temperature.

Item Type:Article
Source:Copyright of this article belongs to Springer Nature Switzerland AG
Keywords:Flow Stress;Strain Rate Sensitivity;A356 Alloy;Adiabatic Shear Band;Strain Rate Range
ID Code:135286
Deposited On:20 Jan 2023 10:46
Last Modified:20 Jan 2023 10:46

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