SYMPOSIA PAPER Published: 01 January 2000
STP12463S

Correlation of Hardening and Microstructure of Tantalum Irradiated with Heavy Ions

Source

The microhardness change of tantalum irradiated with heavy ions has been evaluated using a micro-indentation technique. The increase in hardness by irradiation was significant below ∼900K and negligible above ∼1100K. The hardness decreased steeply with temperature at ∼1000K. Correlation of the results with microstructure data showed that the strength of voids and line dislocations as barriers against deformation should be very weak relative to that of loops and TEM-invisible defects. The temperature and fluence dependence of the hardening by TEM-invisible defects, derived by the correlation, implied an accumulation process of cascade vacancy clusters during irradiation.

Author Information

Muroga, T
National Institute for Fusion Science, Gifu, Japan
Yasunaga, K
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan
Katoh, Y
Institute of Advanced Energy, Kyoto University, Kyoto, Japan
Watanabe, H
Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
Yoshida, N
Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan
Noda, N
National Institute for Fusion Science, Gifu, Japan
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Details
Developed by Committee: E10
Pages: 1186–1196
DOI: 10.1520/STP12463S
ISBN-EB: 978-0-8031-5419-3
ISBN-13: 978-0-8031-2852-1