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Influence of Minor Element on Microstructure and Mechanical Properties of TiFe Ultrafine Eutectic Alloys

TiFe 공정합금의 미소합금 첨가에 따른 미세구조 변화 및 기계적 물성

  • Lee, Chan Ho (Department of Advanced Materials Engineering, Sejong University) ;
  • Jo, Jae Hyuk (Department of Advanced Materials Engineering, Sejong University) ;
  • Mun, Sang Chul (Department of Advanced Materials Engineering, Sejong University) ;
  • Kim, Jung Tae (Department of Advanced Materials Engineering, Sejong University) ;
  • Yeo, Eun Jin (Department of Advanced Materials Engineering, Sejong University) ;
  • Kim, Ki Buem (Department of Advanced Materials Engineering, Sejong University)
  • 이찬호 (세종대학교 나노신소재공학과) ;
  • 조재혁 (세종대학교 나노신소재공학과) ;
  • 문상철 (세종대학교 나노신소재공학과) ;
  • 김정태 (세종대학교 나노신소재공학과) ;
  • 여은진 (세종대학교 나노신소재공학과) ;
  • 김기범 (세종대학교 나노신소재공학과)
  • Received : 2012.10.04
  • Accepted : 2012.10.24
  • Published : 2012.11.27

Abstract

Recently, ultrafine grained (ufg, typically 100 > d > 500 nm) Ti-Fe eutectic materials have been highlighted due to their extraordinarily high strength and good abrasion resistance compared to conventional coarse grained (cg, d > $1{\mu}m$) materials. However, these materials exhibit limited plastic strain and toughness during room temperature deformation due to highly localized shear strain. Several approaches have been extensively studied to overcome such drawbacks, such as the addition of minor elements (Sn, Nb, Co, etc.). In this paper, we have investigated the influence of the addition of Gd and Y contents (0.3-1.0 at.%) into the binary Ti-Fe eutectic alloy. Gd and Y are chosen due to their immiscibility with Ti. Microstructural investigation reveals that the Gd phase forms in the eutectic matrix and the Gd phase size increases with increasing Gd content. The improvement of the mechanical properties is possibly correlated to the precipitation hardening. On the other hand, in the case of Ti-Fe-Y alloys, with increasing Y contents, primary phases form and lamellar spacing increases compared to the case of the eutectic alloy. Investigation of the mechanical properties reveals that the plasticity of the Ti-Fe-Y alloys is gradually improved, without a reduction of strength. These results suggest that the enhancement of the mechanical properties is closely related to the formation of the primary phase.

Acknowledgement

Supported by : 한국연구재단

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