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Title: Deformation behaviour of Mg/Y 2O 3 nanocomposite at elevated temperatures
Authors: Mallick, A.
Tun, K.S. 
Gupta, M. 
Keywords: Deformation
High-temperature properties
Stress relaxation
Issue Date: 15-Aug-2012
Citation: Mallick, A., Tun, K.S., Gupta, M. (2012-08-15). Deformation behaviour of Mg/Y 2O 3 nanocomposite at elevated temperatures. Materials Science and Engineering A 551 : 222-230. ScholarBank@NUS Repository.
Abstract: In this study, we focused on the tensile deformation behaviour of Mg and Mg/Y 2O 3 nanocomposite that includes temperature dependent strength, ductility, strain rate sensitivity and activation volume. Bulk nanocomposite with monolithic Mg as the matrix, reinforced by 2vol.% nano-yttria (Y 2O 3) particulate was prepared by powder metallurgy technique incorporating energy efficient microwave assisted rapid sintering process followed by hot extrusion. Results revealed that the presence of thermally stable nano-Y 2O 3 particulates as reinforcement leads to a significant improvement in 0.2% yield strength and tensile strength at all test temperatures (25-250°C) when compared to pure Mg. No apparent necking was detected in the composite samples following tensile testing at any of the test temperatures. These results suggest that an increase in test temperature up to 250°C does not affect the homogeneous deformation process exhibited by the composite samples. Strain rate sensitivity and the apparent activation volume were measured by the repeated stress relaxation test. High strain rate sensitivity and low activation volume at room temperature as compared to pure Mg suggest that different rate controlling deformation mechanisms exist in the composite samples. Low temperature sensitivity was observed in the composite. © 2012 Elsevier B.V.
Source Title: Materials Science and Engineering A
ISSN: 09215093
DOI: 10.1016/j.msea.2012.04.116
Appears in Collections:Staff Publications

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