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Ni3(Al, Ti) 単結晶における高温降伏現象

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Title: Ni3(Al, Ti) 単結晶における高温降伏現象
Other Titles: High Temperature Yielding of Ni3(Al, Ti) Single Crystals
Authors: 落合, 鍾一1 Browse this author
三浦, 誠司2 Browse this author →KAKEN DB
三島, 良直3 Browse this author
鈴木, 朝夫4 Browse this author
Authors(alt): Ochiai, Shouichi1
Miura, Seiji2
Mishima, Yoshinao3
Suzuki, Tomoo4
Keywords: intermetallic compound
Ni3(Al, Ti)
single crystal
flow stress
high temperature yielding
strain rate
positive temerature dependence of strength
steady-state deformation
Issue Date: 1-Jul-1987
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
Volume: 51
Issue: 7
Start Page: 608
End Page: 615
Publisher DOI: 10.2320/jinstmet1952.51.7_608
Abstract: A Ni3(Al, Ti) single crystal with orientation near [001] showed a new type of yielding accompanied by a remarkable yield drop and a successive steady state deformation when it was deformed under a certain test condition at elevated temperatures. The characteristics of this high temperature yielding phenomenon (H.T.Y.) were studied by compression tests at various temperatures from 77 to 1273 K with strain rates varying from 1.4×10−2 to 1.4×10−5 s−1. Results obtained are as follows: (1) {111} slip operates predominantly at higher temperatures beyond the maximum in flow stress under the conditions where the H.T.Y. occurs. (2) The state equation of this high temperature steady state deformation can be expressed as the same type as that of steady state creep. The value of the stress exponent is about 3 and the activation energy is nearly equal to that for diffusion. This suggests that {111} slip deformation is controlled by the viscous motion of dislocations. (3) In the H.T.Y., the stress drop was not so rapid and a Lüders band propagation was not observed. These characteristics are consistent with those of the Johnston type, so that the appreciable yield drop is considered to be due to the increase of mobile dislocation density during plastic deformation. (4) Using state equation obtained, the condition for the development of the H.T.Y. can be derived, by which H.T.Y. is expected only for single crystals having near ⟨100⟩ orientations. This prediction may well accounts for the experimental result.
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)

Submitter: 三浦 誠司

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