TY - JOUR
T1 - Deformation behavior of Mo5Si3 single crystal at high temperatures
AU - Yoshimi, K.
AU - Yoo, M. H.
AU - Wereszczak, A. A.
AU - Borowicz, S. M.
AU - George, E. P.
AU - Miura, E.
AU - Hanada, S.
N1 - Funding Information:
The authors thank E. Aoyagi and Y. Hayasaka of IMR, Tohoku University for their assistance for TEM sample preparation. This research was sponsored by the Division of Materials Science and Engineering, Office of Basic Energy Sciences, US Department of Energy, under Contract DE-AC05-00OR22725 with UT-Battelle, LLC.
PY - 2002/6
Y1 - 2002/6
N2 - Compressive deformation behavior of D8m-type Mo5Si3 single crystals was investigated at temperatures between 1473 and 1723 K in an argon atmosphere. Four compression axes, namely [001], near-[111], near [101] and [100] were chosen. Plasticity occured at and above 1573 K, whereas at 1473 K the crystal failed by brittle fracture before yielding. After high-temperature yielding, all crystals except the [001] crystal exhibited a large yield drop, followed by an apparent steady state flow. Slip traces of {110} and other relatively low index planes were observed on crystal surfaces. Dislocations were characterized on (001) slip plane by TEM, and <110>(001) slip was identified. Considering the constant-stress flow behavior as a steady-state creep process, it was estimated that a stress component is about 6 and an apparent activation energy of deformation is approximately 490 kJ mol-1.
AB - Compressive deformation behavior of D8m-type Mo5Si3 single crystals was investigated at temperatures between 1473 and 1723 K in an argon atmosphere. Four compression axes, namely [001], near-[111], near [101] and [100] were chosen. Plasticity occured at and above 1573 K, whereas at 1473 K the crystal failed by brittle fracture before yielding. After high-temperature yielding, all crystals except the [001] crystal exhibited a large yield drop, followed by an apparent steady state flow. Slip traces of {110} and other relatively low index planes were observed on crystal surfaces. Dislocations were characterized on (001) slip plane by TEM, and <110>(001) slip was identified. Considering the constant-stress flow behavior as a steady-state creep process, it was estimated that a stress component is about 6 and an apparent activation energy of deformation is approximately 490 kJ mol-1.
KW - High temperature
KW - Intermetallic compound
KW - Mechanical properties
KW - Molybdenum silicide
KW - Single crystal
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U2 - 10.1016/S0921-5093(01)01578-7
DO - 10.1016/S0921-5093(01)01578-7
M3 - Article
AN - SCOPUS:0036602320
VL - 329-331
SP - 228
EP - 234
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -