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J. Jpn Inst. Metal 63(2) 179.pdf1.39 MBPDFView/Open
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Title: モリブデン<001>対称傾角粒界の粒界破壊強度と粒界エネルギーの傾角依存性
Other Titles: Misorientation Dependence of Grain Boundary Fracture Strength and Grain Boundary Energy for Molybdenum<001> Symmetric Tilt Boundaries
Authors: 池田, 賢一1 Browse this author →KAKEN DB
森田, 孝治2 Browse this author
中島, 英治3 Browse this author
阿部, 弘4 Browse this author
Authors(alt): Ikeda, Kenichi1
Morita, Koji2
Nakashima, Hideharu3
Abe, Hiroshi4
Keywords: molybdenum
<001> symmetric tilt boundary
boundary fracture strength
grain boundary energy
Issue Date: Feb-1999
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: 63
Issue: 2
Start Page: 179
End Page: 186
Publisher DOI: 10.2320/jinstmet1952.63.2_179
Abstract: It has been well known that the boundary fracture strength of molybdenum depends strongly on factors such as grain boundary character and impurity segregation (C and O). In order to clarify the influence of grain boundary geometrical and chemical factors on the boundary fracture strength of molybdenum, bicrystals with a ⟨001⟩ symmetric tilt boundary were prepared in a range of misorientation angles φ from 0° to 90°, and the boundary fracture strength was measured for not-purified and purified specimens by a four-point bending test. In addition, misorientation dependence of the grain boundary energy was measured by a thermal grooving method, and the correlation between the grain-boundary energy and the boundary fracture strength for purified specimens was also investigated. The main results obtained here are as follows. (1) The grain-boundary energy depends remarkably on the misorientation angle. Large energy cusps were observed at the near 36.9°/(1\bar30) and 53.1°/(1\bar20)Σ5 coincidence tilt boundaries, and small energy cusp was observed at the near 22.6°/(1\bar50)Σ13 coincidence tilt boundary. (2) For the purified specimens, the boundary fracture strength depends on its misorientation angles φ. However, for the not-purified specimen, the misorientation dependence was not observed at large angle boundaries in the range of φ from 16° to 54°. (3) The conspicuous difference in the boundary fracture strength between the not-purified and purified specimens was not recognized. It is concluded that the influence of impurity atoms (C and O) on the boundary fracture strength was relatively small for the ⟨001⟩ symmetric tilt boundaries. (4) A relatively good correlation was obtained between the grain boundary energy and the boundary fracture strength in the ⟨001⟩ symmetric tilt
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: 池田 賢一

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