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Effect of cold-work on the Hall–Petch breakdown in copper based micro-components
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing – Casting.
School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore.
Singapore Institute of Manufacturing Technology (SIMTech), Singapore.
Materials Engineering, Monash University, Australia.
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2015 (English)In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 80, part A, 124-135 p.Article in journal (Refereed) Published
Abstract [en]

Effects of substructural dimensions on the mechanical properties of micro-pins produced by an open-die micro-extrusion/forging process were studied. Micro-pins of diameter 0.3 mm were manufactured from copper strips, having different initial grain sizes. Micro-compression tests on the micro-pins revealed no significant size effect, even if the number of grains over the diameter of the micro-pins falls below its critical value. However, relaxation of the as-formed substructure using recovery annealing led to a surprising drop in the flow stress of the micro-pins. This was explained and attributed to the number of subgrains over the diameter of the micro-pins, showing the important role of subgrains rather than grains in determining the mechanical properties.

Place, publisher, year, edition, pages
2015. Vol. 80, part A, 124-135 p.
Keyword [en]
Microforming; Subgrain; Microstructure; Size effect;Dislocation Cells
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:hj:diva-25090DOI: 10.1016/j.mechmat.2014.10.003ISI: 000347493100010Local ID: JTHMaterialISOAI: diva2:759748
Available from: 2014-10-31 Created: 2014-10-31 Last updated: 2016-03-22Bibliographically approved

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Ghassemali, EhsanJarfors, Anders E.W.
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JTH. Research area Materials and manufacturing – Casting
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