Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Changes of Lamellar Structure of TiAl Intermetallic Compound Heat Treatment

열처리에 따른 TiAl금속간화합물의 층상조직 변화

  • Shin, Jae-Kwan (Department of Metallurgical Engineering, Kyungpook National University) ;
  • Chung, In-Sang (Department of Metallurgical Engineering, Kyungpook National University) ;
  • Park, Kyuong-Chae (Department of Metallurgical Engineering, Kyungpook National University)
  • 신재관 (경북대학교 공과대학 금속공학과) ;
  • 정인상 (경북대학교 공과대학 금속공학과) ;
  • 박경채 (경북대학교 공과대학 금속공학과)
  • Published : 1993.09.30
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Abstract

The changes of lamellar(${\alpha}_2+{\gamma}$) structure of TiAl intermetallic compound which is a high potential, high temperature aerospace material was investigated by heat treatment. The lamellar structure was short and made subgrain in prior a grains after homogenizing at 1523 K. It became longer and finer, and the subgrain went out during subsequent isothermal heatteating at 1273 K. The yield, fracture strength and strain to fracture if the heat treated specimens was increased and the hardness of them was decreased a little in the finer lamellar structure, because fine lamellar interface, sugrain boundary and grain boundary may block initiation and propagation of crack.

Keywords

Acknowledgement

Supported by : 한국학술진흥재단