Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 7-8, Pages 2136-2141Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.11.060
Keywords
Hafnium; Hydrides; Hydrogen; High-pressure torsion; Severe plastic deformation; Ultrafine-grained structure
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- NEDO Fundamental Research [2006-2012]
- Kyushu University Interdisciplinary Programs in Education and Projects in Research Development
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Pure Hf (99.99%) is processed by high-pressure torsion (HPT) under pressures of 4 and 30 GPa to form an ultrafine-grained structure with a gain size of similar to 180 nm. X-ray diffraction analysis shows that, unlike Ti and Zr, no omega phase formation is detected after HPT processing even under a pressure of 30 GPa. A hydride formation is detected after straining at the pressure of 4 GPa. The hydride phase decomposes either by application of a higher pressure as 30 GPa or by unloading for prolong time after HPT processing. Microhardness, tensile and bending tests show that a high hardness (360 Hv) and an appreciable ductility (8%) as well as high tensile and bending strength (1.15 and 2.75 GPa, respectively) are achieved following the high-pressure torsion. (C) 2009 Elsevier B.V. All rights reserved.
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