TY - JOUR
T1 - Plastic deformation of icosahedral Al-Pd-Mn single quasicrystals to large strains I. Experiments
AU - Kabutoya, E.
AU - Tamura, R.
AU - Takeuchl, S.
AU - Edagawa, K.
AU - Guo, J. Q.
AU - Tsai, A. P.
N1 - Funding Information:
The authors are grateful to T. Hashlmoto of the Institute of Industrial Science, University of Tokyo, for his assistance with the experiments. The present work has been supported by the grant-in-aid for scientific research (12450261) from the Ministry of Education, Science, Culture and Sports, and by Core Research for Embryonic Science and Technology from the Japan Science and Technology Corporation.
PY - 2002/1
Y1 - 2002/1
N2 - Icosahedral Al-Pd-Mn single quasicrystals, grown by the Czochralski method, were deformed in compression along a twofold direction to large strains. The true stress versus true strain curves showed three stages: the initial work-hardening stage, a large work-softening stage followed by a weak workhardening stage. The minimum flow stress was about half the maximum flow stress. The stress relaxation experiments showed temperature-dependent activation volume versus applied stress relations. Assuming that the flow stress is composed of the effective stress, the temperature-dependent dragging stress and the internal stress, the effective stress dependence of the activation enthalpy was analysed for both the maximum-flow-stress state and the minimum-flow-stress state. The activation enthalpy of the latter state was found to be about 20% smaller than the former state, and the work softening is due to a decrease in the activation enthalpy with increasing plastic strain.
AB - Icosahedral Al-Pd-Mn single quasicrystals, grown by the Czochralski method, were deformed in compression along a twofold direction to large strains. The true stress versus true strain curves showed three stages: the initial work-hardening stage, a large work-softening stage followed by a weak workhardening stage. The minimum flow stress was about half the maximum flow stress. The stress relaxation experiments showed temperature-dependent activation volume versus applied stress relations. Assuming that the flow stress is composed of the effective stress, the temperature-dependent dragging stress and the internal stress, the effective stress dependence of the activation enthalpy was analysed for both the maximum-flow-stress state and the minimum-flow-stress state. The activation enthalpy of the latter state was found to be about 20% smaller than the former state, and the work softening is due to a decrease in the activation enthalpy with increasing plastic strain.
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U2 - 10.1080/01418610208239604
DO - 10.1080/01418610208239604
M3 - Article
AN - SCOPUS:0036112408
SN - 0141-8610
VL - 82
SP - 369
EP - 377
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
IS - 2
ER -