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Main Title: Effect of hot isostatic pressing on densification, microstructure and nanoindentation behaviour of Mg–SiC nanocomposites
Author(s): Hübler, Daniela
Ghasemi, Alireza
Riedel, Ralf
Fleck, Claudia
Kamrani, Sepideh
Type: Article
Abstract: The production of fully dense nanocomposites with a homogeneous distribution of nanoparticles through powder metallurgy (PM) techniques is challenging. Additionally to mechanical milling, pressing and sintering, a final consolidation process is needed to fully densify the nanocomposite. Hot isostatic pressing (HIP) is a promising alternative method to other hot forming processes to eliminate porosity in these PM parts. In contrast to hot extrusion, for instance, isotropic properties are achieved, and textures, as they are usually observed in Mg after uniaxial deformation, are avoided. Here, we evaluate the effect of HIP on the densification, microstructure and (nano)hardness of Mg–SiC nanocomposites. Even though density increased indeed, we observed no increase in the mechanical properties, due to significant heterogeneity in the microstructure. SiC-free regions with a higher grain size developed. Local nanohardness measurements of the HIPed Mg nanocomposite revealed that these regions had a significantly lower nanohardness than the SiC-containing regions. Under consideration of mechanisms reported to be active in Mg in the pressure and temperature regime we used, we conclude that grain growth is the most likely mechanism leading to the microstructure observed after HIP. This is driven by the thermodynamic pressure to decrease the grain boundary energy and facilitated by a slightly inhomogeneous distribution of SiC nanoparticles in the sintered nanocomposite.
Subject(s): densification
nanoindentation behaviour
Mg–SiC nanocomposites
hot isostatic pressing
Issue Date: 13-May-2020
Date Available: 12-Mar-2021
Is Part Of: 10.14279/depositonce-12634
Language Code: en
DDC Class: 670 Industrielle Fertigung
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2020
Journal Title: Journal of Materials Science
Publisher: SpringerNature
Volume: 55
Issue: 24
Publisher DOI: 10.1007/s10853-020-04758-5
Page Start: 10582
Page End: 10592
EISSN: 1573-4803
ISSN: 0022-2461
TU Affiliation(s): Fak. 3 Prozesswissenschaften » Inst. Werkstoffwissenschaften und -technologien » FG Werkstofftechnik
Appears in Collections:Technische Universität Berlin » Publications

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