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Metals 2018, 8(9), 699; https://doi.org/10.3390/met8090699

Effect of Calcium on the Hot Working Behavior of AZ31-1.5 vol.% Nano-Alumina Composite Prepared by Disintegrated Melt Deposition (DMD) Processing

1
Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
2
Independent Researcher (Formerly with City University of Hong Kong), No. 2/B, Vinayaka Nagar, Hebbal, Bengaluru 560024, India
3
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
Current address: Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB E3B5A1, Canada.
Current address: Department of Physics, Bharathiar University, Coimbatore 641046, India.
*
Author to whom correspondence should be addressed.
Received: 15 August 2018 / Revised: 1 September 2018 / Accepted: 3 September 2018 / Published: 5 September 2018
(This article belongs to the Special Issue Production and Properties of Light Metal Matrix Nanocomposites)
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Abstract

AZ31-based nanocomposites are produced by disintegrated melt deposition (DMD) processing. In this investigation, the influence of the addition of Ca to AZ31-1.5 vol.% nano-alumina composite (base) on its hot working behavior is studied to develop a processing route for manufacturing components with these composites. A processing map for the base composite in the temperature range 250–500 °C and strain rate 0.0003–10 s−1 is compared with those for composites with 1% Ca and 2% Ca. The grain size of the base composite is refined by Ca addition and the <10 1 ¯ 0> texture is strengthened. Besides nano-alumina particles, the Ca-containing composites have intermetallic particles (Mg,Al)2Ca present at grain boundaries as well as in the matrix. All the three nanocomposites exhibit three DRX domains, with one of them at high strain rate that facilitates high productivity. Addition of Ca mitigates the occurrence of wedge cracking that occurs in AZ31-1.5NAl composite. Increasing of Ca addition to 2% prevents dynamic recrystallization (DRX) at lower temperatures and strain rates and causes only dynamic recovery. At lower temperatures and higher strain rates, DRX occurs by basal + prismatic slip along with recovery via climb controlled by grain boundary self-diffusion promoted by very fine grain size in the composites. View Full-Text
Keywords: Mg–Al–Zn–Ca-nano-alumina; nanocomposite; thermomechanical processing; processing map; microstructure; kinetic analysis Mg–Al–Zn–Ca-nano-alumina; nanocomposite; thermomechanical processing; processing map; microstructure; kinetic analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Rao, K.P.; Dharmendra, C.; Suresh, K.; Prasad, Y.V.R.K.; Gupta, M. Effect of Calcium on the Hot Working Behavior of AZ31-1.5 vol.% Nano-Alumina Composite Prepared by Disintegrated Melt Deposition (DMD) Processing. Metals 2018, 8, 699.

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