TY - GEN
T1 - Temperature dependence of yield stress and dislocation dissociation in L12-ordered intermetallic compounds
AU - Inui, Haruyuki
AU - Okamoto, Norihiko L.
N1 - Funding Information:
The authors are grateful for the helpful discussion with P. Veyssière of CNRS-ONERA, France. This work was supported by Grant-in-Aid for Scientific Research (A) (No.21246101 and No.21360337) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and in part by the Global COE (Center of Excellence) Program of International Center for Integrated Research and Advanced Education in Materials Science from the MEXT, Japan.
PY - 2011
Y1 - 2011
N2 - The temperature dependence of yield stress and the associated dislocation dissociation in L12 intermetallic compounds are investigated in order to check the feasibility of the classification of L12 intermetallic compounds so far reported in terms of the planarity of core structures of partial dislocations with b = 1/2〈110〉 and 1/3〈112〉 on {111} and {001} glide planes. In contrast to what is believed from the reported classification, the motion of APB-coupled dislocations is proved to give rise to the rapid decrease in yield stress at low temperatures for Co3Ti and Co3 (Al, W). The temperature dependence of yield stress at low temperatures is newly interpreted in terms of a thermal component of solid-solution hardening, at least, for these two L12 compounds. We have proposed a new way to describe the yield stress-temperature curves of L12 compounds with three parameters (the athermal and thermal components of solid-solution hardening and the anomalous strengthening component) when the dislocation dissociation scheme is of the APB-type.
AB - The temperature dependence of yield stress and the associated dislocation dissociation in L12 intermetallic compounds are investigated in order to check the feasibility of the classification of L12 intermetallic compounds so far reported in terms of the planarity of core structures of partial dislocations with b = 1/2〈110〉 and 1/3〈112〉 on {111} and {001} glide planes. In contrast to what is believed from the reported classification, the motion of APB-coupled dislocations is proved to give rise to the rapid decrease in yield stress at low temperatures for Co3Ti and Co3 (Al, W). The temperature dependence of yield stress at low temperatures is newly interpreted in terms of a thermal component of solid-solution hardening, at least, for these two L12 compounds. We have proposed a new way to describe the yield stress-temperature curves of L12 compounds with three parameters (the athermal and thermal components of solid-solution hardening and the anomalous strengthening component) when the dislocation dissociation scheme is of the APB-type.
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U2 - 10.1557/opl.2011.460
DO - 10.1557/opl.2011.460
M3 - Conference contribution
AN - SCOPUS:80053202593
SN - 9781605112725
T3 - Materials Research Society Symposium Proceedings
SP - 405
EP - 416
BT - Intermetallic-Based Alloys for Structural and Functional Applications
T2 - 2010 MRS Fall Meeting
Y2 - 29 November 2010 through 3 December 2010
ER -