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Effect of helium on the deformation mode for Ti-7.5AI alloy
Affiliation:1. Department of Geology and Palaeontology, Institute of Earth Sciences, Karl-Franzens University, Heinrichstr. 26, A-8010 Graz, Austria;2. Department of Ecology, Faculty of Sciences, Universidad Autónoma de Madrid, E-28049 Madrid, Spain;3. 16, rue Mégret, F-33400 Talence, France;4. Centre de recherches sur la paléobiodiversité et les paléoenvironnements, Université Paris-6, CNRS-MNHN, T. 46-56, E. 5, case 104, 4 Place Jussieu, F-75252 Paris cedex 05, France;5. Institute of Earth Surface Dynamics, Faculty of Geosciences and Environment, University of Lausanne, CH-1015 Lausanne, Switzerland;6. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;7. Department of Science, University of Roma Tre, Largo S. Leonardo Murialdo 1, I-00146 Rome, Italy;8. Geoscience Center, University of Goettingen, Goldschmidt-Str. 3, D-37077 Göttingen, Germany;9. School of Geography, Queen Mary University of London, Mile End Road, London E1 4NS, UK;10. Instituto Madrileño De Estudios Avanzados-Agua (IMDEA-Water Institute), Calle Punto Net 1, Edificio ZYE 2°, Parque Cientifico Tecnológico de la Universidad de Alcalá, 28805 Alcalá de Henares, Madrid, Spain;11. “Emil Racoviţă” Institute of Speleology, Romanian Academy, Clinicilor 5, 400006 Cluj Napoca, Romania;12. Zoological Institute and Museum, Biozentrum Grindel, University Hamburg, Martin-Luther King Platz 3, D-20146 Hamburg, Germany;13. 10400 Lake Ridge Drive, Oakton, VA 22124, USA;14. Senckenberg Forschungsinstitut und Naturmuseum, Senckenberganlage 25, D-60325 Frankfurt-am-Main, Germany;15. Freshwater Biology, Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000 Brussels, Belgium;p. Department of Earth and Environmental Sciences, Palaeontology and Geobiology, GeoBio-Center, Ludwig-Maximilians-University München, Richard-Wagner-Str. 10, D-80333 München, Germany;q. Department of Earth Science, Natural History Museum, Cromwell Road, London SW7 7BD, UK;r. 14 avenue des Écureuils, F-56530 Gestel, France;s. Department of Mathematics and Geosciences, University of Triest, Via Weiss 2, I-34128 Triest, Italy;t. Viale Ludovico Muratori, 225, I-41124 Modena, Italy;u. Department for Geodynamics and Sedimentology, Institute for Palaeontology, Geozentrum, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria;v. Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK;w. Department of Geology, Kent State University, OH 44242, USA;x. Institute of Geology and Mineralogy, University of Cologne, Zülpicher Strasse 49A, D-50674 Cologne, Germany;y. Department of Invertebrates, Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000 Brussels, Belgium;z. Wollongong City Council, Locked Bag 8821, Wollongong DC, NSW 2500, Australia;1. IPCV Lab, Department of Electrical Engineering, NIT Rourkela, India;2. Department of Electrical Engineering, NIT Rourkela, India;1. Department of Animal Science, Kildee Hall, Iowa State University, 109 Kildee Hall, Ames, IA 50011, USA;2. Pig Development Department, Teagasc Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland;3. Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
Abstract:The effect of helium on the mechanical properties of Ti-7.5Al alloy was investigated at 873 K on the specimens injected with helium to the concentration CHe of 5, 18 and 30 appm by using a cyclotron. Helium had a small effect on the yield stress but a large one on the elongation; the elongation decreased at first with increasing CHe in the region of CHe less than 18 appm and increased again for larger CHe. Correspondingly, the deformation mode changed with the helium concentration. The deformation of uninjected specimens proceeded by the dislocation slip and two twin systems, that is, (101̄2)〈101̄1̄〉 and (112̄1)〈112̄6〉. The latter twin system disappeared in the 18 appm helium-injected specimen. Both deformation twins disappeared in the 30 appm specimen, the microstructure of which exhibited the uniform cellular structure of dislocations.
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