Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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A Study on the Fatigue Crack Growth Behavior of A Ti-24Al-11Nb Alloy

Ti-24Al-11Nb 합금의 피로균열성장거동에 관한 연구

  • Bae, Gyu-Sik (Department of Electronic Materials Department) ;
  • Lee, Mun-Hui (Department of Electronic Materials Department)
  • Published : 1992.10.01
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Abstract

The mechanisms of fatigue crack growth (FCG) in a Ti$_3$Al-based (${\alpha}_2$) alloy, Ti-24Al-11Nb (a/o) with acicular microstructure were studied with particular attention focused on the fatigue crack path through the microstructure and on the effects of specimen orientation and crack closure. The results showed that the fatigue cracks of Ti-24Al-11Nb alloy grew much faster than conventional titanium alloys, with little difference in FCG rates for TL and TS orientations. The fatigue crack paths revealed crystallographic transgranular fracture with frequent serrations and branching. This is in agreement with the known effects of slip planarity and microstructure on the FCG behavior. The load-displacement hysteresis loops showed that the crack closure influenced the FCG behavior.

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