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Effect of strain rate and temperature on the plastic deformation behaviour of a bulk metallic glass composite

Singh, P. S. and Narayan, R. L. and Sen, Indrani and Hofmann, D. C. and Ramamurty, U. (2012) Effect of strain rate and temperature on the plastic deformation behaviour of a bulk metallic glass composite. Materials Science and Engineering A, 534 . pp. 476-484. ISSN 0921-5093. doi:10.1016/j.msea.2011.11.096.

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The composites consisting of amorphous matrix reinforced with crystalline dendrites offer extraordinary combinations of strength, stiffness, and toughness and can be processed in bulk. Hence, they have been receiving intense research interest, with a primary focus to study their mechanical properties. In this paper, the temperature and strain rate effects on the uniaxial compression response of a tailored bulk metallic glass (BMG) composite has been investigated. Experimental results show that at temperatures ranging between ambient to 500 K and at all strain rates; the onset of plastic deformation in the composite is controlled by that in the dendrites. As the temperature is increased to the glass transition temperature of the matrix and beyond, flow in the amorphous matrix occurs readily and hence it dictates the composite's response. The role of the constituent phases in controlling the deformation mechanism of the composite has been verified by assessing the strain rate sensitivity and the activation volume for deformation. The composite is rate sensitive at room temperature with values of strain rate sensitivity and activation volume being similar to that of the dendrites. At test temperatures near to the glass transition temperature, the composite however becomes rate-insensitive corresponding to that of the matrix phase. At low strain rates, serrated flow akin to that of dynamic strain ageing in crystalline alloys was observed and the serration magnitude decreases with increasing temperature. Initiation of the shear bands at the dendrite/matrix interface and propagation of them through the matrix ligaments until their arrest at another interface is the responsible mechanism for this.

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Additional Information:© 2011 Elsevier B.V. Received 20 September 2011. Revised 23 November 2011. Accepted 27 November 2011. Available online 8 December 2011. We acknowledge Liquidmetal Technologies Inc., Rancho Santa Margarita, CA, USA for providing us the material examined in this study.
Subject Keywords: Bulk amorphous materials; Composites; Plastic deformation; Shear bands; Strain rate
Record Number:CaltechAUTHORS:20120507-114109919
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Official Citation:P.S. Singh, R.L. Narayan, Indrani Sen, D.C. Hofmann, U. Ramamurty, Effect of strain rate and temperature on the plastic deformation behaviour of a bulk metallic glass composite, Materials Science and Engineering: A, Volume 534, 1 February 2012, Pages 476-484, ISSN 0921-5093, 10.1016/j.msea.2011.11.096. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31335
Deposited By: Ruth Sustaita
Deposited On:08 May 2012 15:46
Last Modified:09 Nov 2021 19:51

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