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Hardness and fracture toughness of solid solutions of Mg2Si and Mg2Sn

Castillo-Hernandez, Gustavo and Yasseri, Mohammad and Ayachi, Sahar and de Boor, Johannes and Müller, Eckhard (2019) Hardness and fracture toughness of solid solutions of Mg2Si and Mg2Sn. Fizika i Tekhnika Poluprovodnikov. Izdatel'stvo Nauka. ISSN 0015-3222

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Abstract

Thermoelectric material development typically aims at maximizing produced electrical power and efficiency of energy conversion, even though sometimes, this means adding expensive or toxic materials. An alternative is to use highly available and low toxic silicides. In fact, magnesium silicide and magnesium stannide have low densities (1.99 and 3.49 g/cm3 respectively), and exhibit good thermoelectric properties with their thermoelectric figure of merit zT>1 for n-type and near 0.6 for ptype Mg2Si-Mg2Sn solid solutions in the range of 723-773 K. These properties turn the materials into logical candidates for light-weight and efficient thermoelectric generators (TEG). The research on their mechanical properties is however lagging behind and little effort has been put into understanding them. In this work we study the effect of the composition over the Mg2Si-Mg2Sn solid solution series on hardness and fracture toughness values. Hardness ranges from 2.44-5.56 GPa whereas fracture toughness values are in a tighter range (0.64-0.88 MPam1/2). However, the highest value does not belong to binary Mg2Si but a composition within the solid solution that exhibits secondary phase nanostructuring.

Item URL in elib:https://elib.dlr.de/130696/
Document Type:Article
Title:Hardness and fracture toughness of solid solutions of Mg2Si and Mg2Sn
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Castillo-Hernandez, GustavoGerman aerospace center, institute of materials research, köln, germanyUNSPECIFIED
Yasseri, MohammadGerman aerospace center, Institute of materials research, Köln, Germany and Justus Liebig university Giessen, Institute of inorganic and analytical chemistry, 35392 Giessen, GermanyUNSPECIFIED
Ayachi, SaharGerman aerospace center, institute of materials research, köln, germanyUNSPECIFIED
de Boor, JohannesGerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
Müller, EckhardGerman aerospace center, Institute of materials research, Köln, Germany and Institute for inorganic and analytical chemistry, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 58, 35392 Gießen, GermanyUNSPECIFIED
Date:2019
Journal or Publication Title:Fizika i Tekhnika Poluprovodnikov
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Publisher:Izdatel'stvo Nauka
ISSN:0015-3222
Status:Published
Keywords:Hardness; fracture toughness; solid solutions; Magnesium Silicide; Magnesium Stannide
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Antriebssystem und Energiemanagement
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:18 Nov 2019 11:12
Last Modified:06 Jan 2020 13:18

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