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Effect of SiC nanoparticles on manufacturing process, microstructure and hardness of Mg-SiC nanocomposites produced by mechanical milling and hot extrusion

Penther, Daniela and Ghasemi, Alireza and Riedel, Ralf and Fleck, Claudia and Kamrani, Sepideh (2018):
Effect of SiC nanoparticles on manufacturing process, microstructure and hardness of Mg-SiC nanocomposites produced by mechanical milling and hot extrusion.
In: Materials Science and Engineering: A, Elsevier Science SA, Switzerland, pp. 264-272, 738, ISSN 09215093,
DOI: 10.1016/j.msea.2018.09.106,
[Online-Edition: https://www.sciencedirect.com/science/article/abs/pii/S09215...],
[Article]

Abstract

The production of fully dense Mg-SiC nanocomposites with a homogeneous distribution of SiC nanoparticles through powder metallurgy techniques is still a challenging issue. We propose to combine sintering and hot extrusion of mechanically milled composite powders to encompass the known difficulties of conventional processing. Here, we report on the effect of SiC nanoparticle content on the compressibility, microstructure and hardness of SiC-Mg nanocomposites during the different consolidation steps. Cold-isostatic pressing, sintering and indirect hot extrusion were used for compaction and consolidation. Near dense Mg-SiC nanocomposites with 1 and 10 vol% SiC nanoparticles were successfully produced with a homogeneous distribution of the nanoparticles. Scanning electron microscopy, X-ray diffraction and transmission electron microscopy were used to characterise the microstructure of the powders and of the sintered and extruded Mg-SiC nanocomposites. Vickers microhardness tests were done to reveal the hardening effect after sintering and extrusion. The nanoparticles pin the grain boundaries and foster dynamic recrystallisation, so that a nanograined Mg matrix develops and is preserved even after the final consolidation step. The results further show a very good interface adherence between nanoparticles and matrix contributing to the high hardness of the nanocomposites.

Item Type: Article
Erschienen: 2018
Creators: Penther, Daniela and Ghasemi, Alireza and Riedel, Ralf and Fleck, Claudia and Kamrani, Sepideh
Title: Effect of SiC nanoparticles on manufacturing process, microstructure and hardness of Mg-SiC nanocomposites produced by mechanical milling and hot extrusion
Language: English
Abstract:

The production of fully dense Mg-SiC nanocomposites with a homogeneous distribution of SiC nanoparticles through powder metallurgy techniques is still a challenging issue. We propose to combine sintering and hot extrusion of mechanically milled composite powders to encompass the known difficulties of conventional processing. Here, we report on the effect of SiC nanoparticle content on the compressibility, microstructure and hardness of SiC-Mg nanocomposites during the different consolidation steps. Cold-isostatic pressing, sintering and indirect hot extrusion were used for compaction and consolidation. Near dense Mg-SiC nanocomposites with 1 and 10 vol% SiC nanoparticles were successfully produced with a homogeneous distribution of the nanoparticles. Scanning electron microscopy, X-ray diffraction and transmission electron microscopy were used to characterise the microstructure of the powders and of the sintered and extruded Mg-SiC nanocomposites. Vickers microhardness tests were done to reveal the hardening effect after sintering and extrusion. The nanoparticles pin the grain boundaries and foster dynamic recrystallisation, so that a nanograined Mg matrix develops and is preserved even after the final consolidation step. The results further show a very good interface adherence between nanoparticles and matrix contributing to the high hardness of the nanocomposites.

Journal or Publication Title: Materials Science and Engineering: A
Volume: 738
Publisher: Elsevier Science SA, Switzerland
Uncontrolled Keywords: Mg-SiC nanocomposite; Mechanical milling; Cold isostatic pressing; Hot extrusion; Vickers hardness MAGNESIUM-MATRIX COMPOSITES; REINFORCEMENT; POWDERS; COLD; RECRYSTALLIZATION; COMPRESSIBILITY; PARTICLES; STRENGTH; BEHAVIOR
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 03 Dec 2018 14:49
DOI: 10.1016/j.msea.2018.09.106
Official URL: https://www.sciencedirect.com/science/article/abs/pii/S09215...
Funders: Deutsche Forschungsgemeinschaft (DFG), KA 4325/1-1
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