Grain Boundary Fracture in Molybdenum Bicrystals with Various ⟨110⟩ Symmetric Tilt Boundaries

DOI Web Site 被引用文献12件 参考文献15件
  • Kurishita Hiroaki
    Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University
  • Ôishi Akira
    Graduate Student, Kyushu University
  • Kubo Haruyoshi
    Graduate Student, Kyushu University
  • Yoshinaga Hideo
    Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University

書誌事項

タイトル別名
  • Grain Boundary Fracture in Molybdenum Bicrystals with Various ⟨110⟩ Symmetric Tilt Boundaries

抄録

In order to investigate the grain boundary fracture in molybdenum with ⟨110⟩ symmetric tilt boundaries, the four-point bending test was conducted at 77 K by using bicrystals with various misorientations from 0° to 90°. A stress-strain curve to fracture was measured as a function of misorientation angle φ. Two classes of specimens were used to clarify the impurity effect on the grain boundary fracture: One was as-grown specimens which contained carbide precipitates at grain boundaries and the other was purified specimens in which no precipitates were observed. A marked misorientation dependence of fracture stress and plastic strain to fracture, was observed for the purified specimen; the stress and strain were both much higher for φ=0°–10° (Σ1), around 70° (Σ3, (112) twin boundary) and around 87°(Σ17, (223) twin boundary) than for the other boundaries. The dependence observed for the as-grown specimen was qualitatively similar to, but quantitatively much less than, that for the purified specimen. The misorientation dependence of grain boundary energy (cohesion) and the effect of carbon impurity on this cohesion were discussed.

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