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Ti3SiC2–MAX 相におけるクリープ変形に伴うキンク形成とキンク強化の可能性

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Title: Ti3SiC2–MAX 相におけるクリープ変形に伴うキンク形成とキンク強化の可能性
Other Titles: Kink Formation through Creep Deformation and Possibility of Kink Strengthening in Ti3SiC2-MAX Phase
Authors: Matsui, Daiki Browse this author
Morita, Koji Browse this author
Terada, Daisuke Browse this author
Ikeda, Ken-ichi Browse this author →KAKEN DB
Miura, Seiji Browse this author →KAKEN DB
Keywords: Ti3SiC2
kink formation
stress dependence
kink strengthening
Issue Date: 1-Dec-2021
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan institute of metals and materials
Volume: 85
Issue: 12
Start Page: 439
End Page: 448
Publisher DOI: 10.2320/jinstmet.J2021031
Abstract: Kink formation and kink strengthening mechanisms were examined in the polycrystalline Ti3SiC2-MAX phase prepared by a spark-plasma-sintering technique. The creep behavior tested by compression at 1200 degrees C showed two deformation regions depending on the applied stresses; at lower stresses of <120 MPa, the stress exponent n exhibited approximate to 1.8, whereas at higher stresses, it exhibited n >= 6.0. The creep behavior can be ascribed to grain boundary sliding mechanism for the lower stresses with n approximate to 1.8 and dislocation-related creep mechanisms for the higher stresses with n >= 6.0. The kink bands were frequently observed to form in the grains deformed only at the higher stresses when its basal plane inclined by about 10-20 degrees against the compressive axis. This suggests that the kink bands might be formed only when two factors of the large stresses acting on the basal plane and the resultant dislocation activities were satisfied. Nanoindentation tests conducted around the formed kink boundaries showed that the hardness increased linearly with decreasing in the distance from the kink boundaries and showed higher values around the kink boundaries. Since the kink boundaries blocked the slip line caused by the nanoindentation, those become a resistance against the dislocation motion caused by the indentation deformation. This suggests that the kink boundaries would be contributed to improve the mechanical properties of the Ti3SiC2-MAX phase.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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