Dislocation distributions in monocrystalline nickel-based superalloys subjected to thermo-mechanical fatigue with and without hold times

F. Sun, J. Zhang

研究成果: Article査読

3 被引用数 (Scopus)

抄録

The characteristics of dislocation configurations under thermo-mechanical fatigue cycling were investigated in [001] oriented nickel-based single-crystal superalloys. Thermo-mechanical fatigue tests were performed on TMS-75 (without hold time) and TMS-82 (with hold time) superalloys. The specimens were subsequently studied by transmission electron microscopy under two-beam conditions. In TMS-75 superalloy, cross-slipping is the main characteristic for the low number of dislocations. In TMS-82 superalloy, more complex process of dislocation configurations has been demonstrated in detail, involving five stages: after the first stress relaxation, after the first tensile plastic deformation, after the second stress relaxation, after 30 cycles and after rupture. In addition, for TMS-82 superalloy, there is a reversible movement behaviour of stacking faults that occur in compression and disappear in tension. After rupture, the number of dislocation is related to the hold time. Longer hold time could generate a higher degree of stress relaxation and produce more dislocations with climbing characteristic.

本文言語English
ページ(範囲)992-1001
ページ数10
ジャーナルFatigue and Fracture of Engineering Materials and Structures
37
9
DOI
出版ステータスPublished - 2014 9月
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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