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Modelling mechanical properties for non-hardenable aluminium alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-8494-3983
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-2832-3293
2007 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 41, no 1, 86-95 p.Article in journal (Refereed) Published
Abstract [en]

A range of mechanical properties have been investigated for non-hardenable aluminium alloys. Commercially pure aluminium, Al-Mn, and Al-Mg alloys in five tempers have been covered. In the models solid solution, particle strengthening and work hardening have been taken into account. Ab-initio calculations of the size and modulus misfit parameters that are needed in the solid solution hardening model have been performed. In accordance with the Labusch-Nabarro model, the solid solution hardening has been shown to be proportional to εL4 / 3 c2 / 3, where εL is the Fleischer misfit parameter and c the solute concentration. A cold work parameter H has been introduced. The contribution from cold working is linear in H for the tensile strength and fatigue endurance, whereas the contributions to the yield strength and to the hardness are proportional to H0.5.

Place, publisher, year, edition, pages
2007. Vol. 41, no 1, 86-95 p.
Keyword [en]
aluminium alloys, material optimisation, mechanical properties, solid solution, work hardening, particle strengthening, multiple regression
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7601DOI: 10.1016/j.commatsci.2007.03.013ISI: 000251041400011Scopus ID: 2-s2.0-35348819299OAI: oai:DiVA.org:kth-7601DiVA: diva2:12680
Note
QC 20100923Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Modelling mechanical properties by analysing datasets of commercial alloys
Open this publication in new window or tab >>Modelling mechanical properties by analysing datasets of commercial alloys
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Commercial alloys are continuously developed to improve their performance. Therefore it is important to develop new optimisation software, which could be used in development of new materials or in materials selection. In this study the mechanical properties which are important in materials selection in mechanical design are investigated. Two types of materials are analysed, aluminium alloys and stainless steels but focus will be on the aluminium alloys.

Thermodynamic analysis has been used to evaluate the effect of the microstructure. Solid solution hardening has been successfully modelled for both aluminium alloys and stainless steels and follows the theories by Labusch and Nabarro. The precipitation hardening is most dominant for the hardenable aluminium alloys, but the non-hardenable alloys also increase their strength from precipitation hardening. The non-hardenable alloys are divided into tempers, which differ in the amount of strain hardening. This has also been modelled successfully.

Combining these fundamental results with multiple regression, models for mechanical properties have been created. Separate models are developed for wrought aluminium alloys and stainless steels. For the aluminium alloys this includes the solid solution hardening and the precipitation hardening. For the stainless steels the thickness, nitrogen content and ferrite content are included together with the solid solution hardening.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 48 p.
Keyword
Aluminium alloys, modelling, material optimisation, mechanical properties, solid solution hardening, precipitation hardening, work-hardening, multiple regression, stainless steel
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-4527 (URN)978-91-7178-803-0 (ISBN)
Presentation
2007-11-30, Konferensrummet 4tr, Materialvetenskap, KTH, Brinellvägen 23, Stockholm, 10:30
Opponent
Supervisors
Note
QC 20101122Available from: 2007-11-12 Created: 2007-11-12 Last updated: 2010-11-22Bibliographically approved
2. Development of tools for integrated optimisation and use of aluminium alloys
Open this publication in new window or tab >>Development of tools for integrated optimisation and use of aluminium alloys
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Commercial alloys are continuously developed to improve their performance. Therefore it is useful to establish new optimisation software, which could be used in development of new materials or in materials selection. In the first part of the thesis, mechanical and technological properties, which are of importance in materials selection in mechanical design, are investigated. Two types of materials are analysed for the mechanical properties, aluminium alloys and stainless steels but only aluminium alloys for the technological properties.

Thermodynamic analysis has been used to evaluate the effect of the microstructure. Solid solution hardening has been successfully modelled for both aluminium alloys and stainless steels following the theories by Labusch and Nabarro. The precipitation hardening is most dominant for the hardenable aluminium alloys, but the non-hardenable alloys also increase their strength from precipitation hardening. The non-hardenable alloys are divided into different tempers, which differ in the amount of strain hardening. This has also been modelled successfully.

Combining these fundamental results with multiple regressions, models for mechanical and technological properties have been created. Separate models are developed for wrought aluminium alloys and stainless steels. For the aluminium alloys these include the solid solution hardening and the precipitation hardening. For the stainless steels, the thickness, nitrogen content and ferrite content are included together with the solid solution hardening.

The second part of the thesis concerns materials selection and materials optimisation. Traditionally materials optimisation includes a preliminary sifting due to the vast number of engineering materials. Then there is a discriminating search followed by an optimisation. In the optimisation part the concept merit indices could be used to rank the materials. A merit index only includes material properties, as for example the characteristic strength, the density or the Young’s modulus. A concept related to the merit indices are the merit exponents, which can be used when no explicit functions for the merit indices are available. The merit exponents can also be used when creating a control area diagram (CAD). These diagrams are used as a design tool, where both the geometry and materials are taken into account. For a situation with several geometrical variables the merit exponents can give information of how much the target function will be influenced by a given property change. This technique can be used for a variety of situations, when there is more than one property limiting the final sizes of a component. Principles for setting up a CAD are given together with how the merit indices and exponents relate to the final CAD.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. vii, 9-61 p.
Keyword
Aluminium alloys, Modelling, Materials optimisation, Mechanical properties
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-37609 (URN)978-91-7501-068-7 (ISBN)
Public defence
2011-09-09, F3, Lindstedtsvägen 26, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20110817Available from: 2011-08-17 Created: 2011-08-15 Last updated: 2011-08-17Bibliographically approved

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Sandström, RolfVitos, Levente

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