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Modelling of solid solution strengthening in multicomponent alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (ENHETEN STRUKTURER)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (ENHETEN STRUKTURER)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (ENHETEN STRUKTURER)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 700, 301-311 p.Article in journal (Refereed) Published
Abstract [en]

With increasing industrial interest in high alloyed multicomponent and High Entropy Alloy (HEA) systems the integration of solid solution strengthening in the ICME framework for efficient Materials Design becomes an important translator tool. A general model is proposed that performs as the framework for an extensive assessment of solid solution strengthening coefficients. The model assumes the concentration dependence of x(2/3) as proposed by Labusch but gives a non-linear composition dependence to the strengthening parameter yielding a better description for concentrated alloys. To calibrate the model, 895 alloy systems, including a wide range of elements, have been used giving a good agreement between calculated and experimental values. Additionally, a promising method is proposed to represent the temperature related softening in the investigated systems.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2017. Vol. 700, 301-311 p.
Keyword [en]
Materials design, Solid solution strengthening, ICME, Multicomponent alloys, Translator, HEA
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-213809DOI: 10.1016/j.msea.2017.06.001ISI: 000406564300036Scopus ID: 2-s2.0-85020482202OAI: oai:DiVA.org:kth-213809DiVA: diva2:1140269
Note

QC 20170911

Available from: 2017-09-11 Created: 2017-09-11 Last updated: 2017-09-18Bibliographically approved
In thesis
1. ICME guided development of cemented carbides with alternative binder systems
Open this publication in new window or tab >>ICME guided development of cemented carbides with alternative binder systems
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The development of alternative binder systems for tungsten carbide (WC) based cemented carbides has again become of relevance due to possible changes in EU regulations regarding the use of Cobalt (Co). A framework for the ICME (Integrated Computational Materials Engineering) based Materials Design is presented to accelerate the development of alternative binder systems.

Part one of this work deals with the design of the cemented carbide composite hardness. It has been shown that the intrinsic binder hardness is comparable to a bulk metal alloy and that based on the binder solubilities a solid solution strengthening model developed in this work can be employed. Using a method presented in this work the non-equilibrium, frozen-in binder solubilities can be obtained. Both the design of the binder phase and composite hardness is presented based on a general Materials Design approach.

Part two deals with a multiscale approach to model the surface gradient formation. The experimentally missing data on liquid binder diffusion has been calculated using AIMD (Ab initio Molecular Dynamics). The diffusion through the liquid cemented carbide binder has to be reduced to an effective diffusion value due to the solid carbides acting as obstacles that increase the diffusion path. The geometrical reduction of the diffusion has been investigated experimentally using the SIMS (secondary ion mass spectroscopy) technique in WC-Nickel-58Nickel diffusion couples. The geometrical contribution of the so-called labyrinth factor has been proven by the combination of the experiments and in conjunction with DICTRA simulations using the precise liquid AIMD diffusivities. Unfortunately, despite the improved kinetic database and the geometrical diffusion reduction, the surface gradient formation cannot be explained satisfactory in complex cemented carbide grades. Additional, but so far unidentified, contributions have to be considered to predict the surface gradient thickness.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 50 p.
Keyword
Cemented carbide, ICME, Materials Design, alternative binder, hardness, AIMD, liquid diffusion, frozen-in solubilities, DICTRA, surface gradients, labyrinth factor
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-214108 (URN)978-91-7729-511-2 (ISBN)
Public defence
2017-10-23, F3, Lindstedsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170919

Available from: 2017-09-19 Created: 2017-09-18 Last updated: 2017-09-20Bibliographically approved

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Walbrühl, MartinLinder, David

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