Misorientation dependence of grain boundary fracture strength and grain boundary energy for molybdenum 〈001〉 symmetric tilt boundaries

Kenichi Ikeda, Koji Morita, Hideharu Nakashima, Hiroshi Abe

研究成果: ジャーナルへの寄稿学術誌査読

7 被引用数 (Scopus)

抄録

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°/(13̄0) and 53.1°/(12̄0) Σ5 coincidence tilt boundaries, and small energy cusp was observed at the near 22.6°/(15̄0) 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 boundary.

本文言語英語
ページ(範囲)179-186
ページ数8
ジャーナルUnknown Journal
63
2
DOI
出版ステータス出版済み - 1999

!!!All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学

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