Low temperature deformation of MoSi2 and the effect of Ta, Nb and Al as alloying elements

Zenk C, Gibson JS, Maier-Kiener V, Neumeier S, Göken M, Korte-Kerzel S (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Acta Materialia Elsevier

Book Volume: 181

Pages Range: 385-398

DOI: 10.1016/j.actamat.2019.09.008

Abstract

Molybdenum disilicide (MoSi2) is a very promising material for high temperature structural applications due to its high melting point (2030∘C), low density, high thermal conductivity and good oxidation resistance. However, MoSi2 has limited ductility below 900∘C due to its anisotropic plastic deformation behaviour and high critical resolved shear stresses on particular slip systems. Nanoindentation of MoSi2 microalloyed with aluminium, niobium or tantalum showed that all alloying elements cause a decrease in hardness. Analysis of surface slip lines indicated the activation of the additional {1 1 0}<1 1 1> slip system in microalloyed MoSi2, which is not active below 300∘C in pure MoSi2. This was confirmed by TEM dislocation analysis of the indentation plastic zone. Further micropillar compression experiments comparing pure MoSi2 and the Ta-alloyed sample enabled the determination of the critical resolved shear stresses of individual slip systems even in the most brittle [0 0 1] crystal direction.

Authors with CRIS profile

Carolin Zenk Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Influence of topology, interfaces and local chemical compositions on the deformations behavior of nanostructures (GRK1896/2-B6) In-situ Characterization of Nanomaterials with Electrons, X-rays/Neutrons and Scanning Probes (GRK 1896) April 1, 2018 - Sept. 30, 2022 Plastic deformation, crack nucleation and fracture in lightweight intermetallic composite materials (EXC315 EAM (A3-7)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2007 - Oct. 31, 2017

Involved external institutions

Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen DE Germany (DE) Montanuniversität Leoben AT Austria (AT)

How to cite

APA:

Zenk, C., Gibson, J.S., Maier-Kiener, V., Neumeier, S., Göken, M., & Korte-Kerzel, S. (2019). Low temperature deformation of MoSi2 and the effect of Ta, Nb and Al as alloying elements. Acta Materialia, 181, 385-398. https://doi.org/10.1016/j.actamat.2019.09.008

MLA:

Zenk, Carolin, et al. "Low temperature deformation of MoSi2 and the effect of Ta, Nb and Al as alloying elements." Acta Materialia 181 (2019): 385-398.

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