期刊
ACTA MATERIALIA
卷 59, 期 17, 页码 6831-6836出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.07.046
关键词
High-pressure torsion; Ultrafine-grained microstructure; Severe plastic deformation; Hardness; Grain size
资金
- Islamic Development Bank (IDB)
- Japan Society for Promotion of Science (JSPS)
- Light Metals Educational Foundation of Japan
- MEXT, Japan
- Kyushu University
- Grants-in-Aid for Scientific Research [22102004] Funding Source: KAKEN
The grain size in pure elements (magnesium, aluminum, silicon, titanium, vanadium, chromium, iron, nickel, copper, zinc, germanium, zirconium, niobium, molybdenum, palladium, silver, indium, tin, hafnium, tantalum, gold and lead) after processing by high-pressure torsion (HPT) reaches steady-state levels where the grain size remains unchanged with straining. The steady-state grain sizes decrease by atomic bond energy and related parameters such as specific heat capacity, activation energy for self-diffusion and homologous temperature and are reasonably independent of stacking fault energy. A good correlation exists between the hardness normalized by the shear modulus and grain size normalized by the Burgers vector, indicating that the important factor for strengthening HPT-processed pure metals is the average size of grains having high angles of misorientation. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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