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Self-organizing nanostructured lamellar (Ti,Zr)C - A superhard mixed carbide
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.ORCID iD: 0000-0003-1102-4342
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Engineering Material Physics.ORCID iD: 0000-0003-2170-0076
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2015 (English)In: International Journal of Refractory Metals and Hard Materials, ISSN 0263-4368, Vol. 51, 25-28 p.Article in journal (Refereed) Published
Abstract [en]

A nanoindentation and first-principles calculation study of a self-organizing nanostructured lamellar (Ti,Zr)C powder has been performed. The nanoindentation measurements reveal that the hardness of the carbide is comparable to the hardest transition metal carbides that have been reported previously. The origin of the super-high hardness is postulated to be due to the inherent bond strength and the large coherency strains that are generated when the carbide demixes within the miscibility gap. The high hardness is maintained at a high level even after 500 h aging treatment at 1300°C. Therefore, it is believed that the new superhard mixed carbide has a high potential in various engineering applications such as in bulk cemented carbide and cermet cutting tools, and in surface coatings.

Place, publisher, year, edition, pages
2015. Vol. 51, 25-28 p.
Keyword [en]
Carbides, Nanoindentation, Phase separation, Ti-Zr-C
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-166883DOI: 10.1016/j.ijrmhm.2015.02.010Scopus ID: 2-s2.0-84923667089OAI: oai:DiVA.org:kth-166883DiVA: diva2:818682
Note

QC 20150609

Available from: 2015-06-09 Created: 2015-05-21 Last updated: 2017-05-26Bibliographically approved
In thesis
1. Powder-metallurgical processing and phase separation in ternary transition metal carbides
Open this publication in new window or tab >>Powder-metallurgical processing and phase separation in ternary transition metal carbides
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ternary transition metal cubic carbides have high hardness and are potential carbides in cemented carbide and cermet tools, as well as hard coatings used to improve metal cutting performance. In the present work, (Ti,Zr)C, (V,Nb)C, and (V,Ta)C ternary cubic carbides were synthesized using traditional powder-metallurgical methods. The effect of synthesis temperature and starting materials on synthesis is investigated, and the microstructure evolution during aging is studied. (Ti,Zr)C was found to decompose into lamellae upon aging at the temperature range from 1150 to 1800 °C. A similar microstructure was observed in (V,Ta)C and (V,Nb)C- 0.5 wt% Fe. All of these structures were found to form through discontinuous precipitation.The grain misorientation distribution of (Ti,Zr)C aged at 1400 °C is investigated. It was found that decomposition tends to occur at high-angle grain boundaries above 25°. The hardness of as-synthesized (Ti,Zr)C powder was found to be 41±6 GPa. Fully decomposed (Ti,Zr)C particles were found to be slightly harder than the undecomposed counterpart. On the other hand, in (V,Nb)C-0.5 wt% Fe, the decomposed structure formed upon aging at 1200 °C was found to have a hardness of 26±2 GPa, which is basically the same as the unaged alloy.Furthermore, the sintering behavior of (Ti,Zr)C with WC-Co is investigated. There are two γ-phases in the final microstructure, one TiC-rich and one ZrC-rich. (Ti,Zr)C was found to decompose at an early stage of sintering, and the final grain size of WC and the two γ-phases was found to be 10% smaller than that in a reference WC-TiC-ZrC-Co composite.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 43 p.
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-207839 (URN)978-91-7729-439-9 (ISBN)
Public defence
2017-06-15, B2, Brinellvägen 23, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170529

Available from: 2017-05-29 Created: 2017-05-26 Last updated: 2017-05-30Bibliographically approved

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Ström, ValterOdqvist, Joakim

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