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Evaluation of the bulk and alpha-case properties in Ti-6Al-4V at micro- and nano-metric length scale
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Department of Materials Science and Engineering, Universitat Politècnica de Catalunya, Barcelona.
Department of Materials Science and Engineering, Universitat Politècnica de Catalunya, Barcelona.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
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2016 (English)In: 13th World Conference on Titanium: August 16-20, 2015 * Manchester Grand Hyatt * San Diego, California / [ed] V. Venkatesh; A.L. Pilchak; J.E. Allison; S. Ankem; R. Boyer; J. Christodoulou; H.L. Fraser; M.A. Imam; J. Kosaka; H.J. Rack; A. Chaterjee; A. Woodfield, John Wiley and Sons , 2016, 1619-1624 p., 271Conference paper (Refereed)
Abstract [en]

In the present study the hardness of individual alpha (α)-Ti grains in Ti-6Al-4V was measured by nanoindentation using Berkovich tip indenter. Additionally, alpha-case layer was induced by performing isothermal heat treatment at 700°C in air for 500 hours. The average hardness of the α-Ti grains found in the bulk material and in the alpha-case layer were 6.7 ± 0.7 GPa and 9.4 ± 1.4 GPa, respectively. The high hardness of the α-Ti grains in the alpha-case layer is due to solid solution strengthening caused by interstitial oxygen diffusion. The thickness of the developed alpha-case layer was estimated metallographically and compared with that measured from a hardness profile performed along the layer. Moreover, electron back-scattered diffraction was used to determine the local crystallographic orientation, the texture of the alloy microstructure, as well as phase fraction changes, where the nanoindentation measurements were performed.

Place, publisher, year, edition, pages
John Wiley and Sons , 2016. 1619-1624 p., 271
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-35257Local ID: 9b6349dd-547a-4f04-83c8-b2775ccabe0dOAI: oai:DiVA.org:ltu-35257DiVA: diva2:1008509
Note
Upprättat; 2016; 20160513 (birsef)Available from: 2016-09-30 Created: 2016-09-30

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