SYMPOSIA PAPER Published: 01 January 1994

Neutron Irradiation Damage and Hardness Anisotropy in Molybdenum Single Crystals


This paper describes the anisotropy of Knoop hardness in olybdenum single crystals neutron-irradiated at high temperatures in the Fast Experimental Reactor (JOYO) and the Fast Flux Test Facility (FFTF/MOTA). Knoop hardness, measured on the (001) surface of the specimen, showed a maximum in the [100] indentation direction and a minimum in the [110] direction. This anisotropic behavior in body-centered-cubic metals remained the same after neutron irradiation, though the average hardness increased. The degree of relative anisotropy, i.e. the hardness ratio between [100] and [110] directions, however, decreased with increasing neutron fluence. The hardness anisotropy was analyzed using the average Taylor factor.

Author Information

Abe, K
Tohoku University, Sendai, Japan
Kanzaki, M
Tohoku University, Sendai, Japan
Satou, M
Tohoku University, Sendai, Japan
Arai, K
Tohoku University, Sendai, Japan
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Developed by Committee: E10
Pages: 94–104
DOI: 10.1520/STP23929S
ISBN-EB: 978-0-8031-5262-5
ISBN-13: 978-0-8031-1488-3