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Thermal Stability of Amorphous MoSiZr Thin Films
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Metallic glass is a class of materials which have a disordered structure of atoms, due to this, glasses lack grains and grain boundaries, which are present in their crystalline counterparts. Metallic glasses have many interesting properties worth investigating, such as high corrosion resistance or high mechanical strength. However, metallic glasses are metastable and will therefore crystallise if heated above the crystallisation temperature. MoSiZr alloys have been studied and to gain knowledge of how the composition affects the crystallisation temperature, which enables further improvement of thermal stability. Crystallisation temperatures of the MoSiZr alloys were investigated by heat treatments in vacuum and ex-situ X-ray diffraction and X-ray reflectivity analysis. The highest thermal stability of the alloys was exhibited by M48Si48Zr4, Mo43Si50Zr7, Mo50Si40Zr10 and Mo45Si43Zr12, they remained amorphous after heat treatment at 1073 K. The resulting crystalline phases are Mo3Si, Mo5Si3 and ZrO2. Oxidation of Zr in the alloys is present only when the Zr content is at least 10 at%, crystallisation is otherwise mainly driven by formation of Mo3Si. Further improvement of the thermal stability is possible by introducing new alloying elements at the cost of those that promote crystallisation. Keeping the content of Zr below 10 at% is of great importance to prevent oxidation.

Place, publisher, year, edition, pages
2016. , 41 p.
Series
UPTEC Q, ISSN 1401-5773 ; 16007
Keyword [en]
amorphous metals, metallic glasses, thermal stability, thin films, crystallisation temperature
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-298165OAI: oai:DiVA.org:uu-298165DiVA: diva2:944967
Educational program
Master Programme in Materials Engineering
Presentation
2016-06-13, Ångströmlaboratoriet, Uppsala, 13:15 (Swedish)
Supervisors
Examiners
Available from: 2016-07-01 Created: 2016-06-30 Last updated: 2016-07-01Bibliographically approved

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CiteExportLink to record
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