Metastable phase characteristics of beta Ti alloys were investigated to consider the relationship of the microstructureand diffraction pattern in TEM. TEM analysis showed that the microstructure was mottled as a modulated structure, and thediffraction pattern was composed of spot streaks between the main spots of a stable beta phase with a specific latticerelationship. The modulated structure may be induced by short distance slip or atom movement during a very short intervalof solution treated and quenched (STQ) materials. The athermal ω phase, which could be precipitated at low temperature aging,is also analysed by the metastable phase. The metastable phases including athermal ω phase had a common characteristic ofhardened and brittle behavior because the dislocation slip was restricted by a super lattice effect due to short distance atommovement at the metastable state.

1. 서 론
 2. 실험 방법
 3. 실험 결과
  3.1 Ti 15-3-3-3의 준안정상
  3.2 TAF(Ti-6Al-4Fe) 준안정상
 4. 고 찰
  4.1 모듈레이트 구조 및 회절줄무늬 현상
  4.2 위성회절점 현상
 5. 결 론
 Acknowledgement
 References

• 최병학(강릉원주대학교 신소재금속공학과) | Byung Hak Choe
• 심종헌(강릉원주대학교 신소재금속공학과) | Jong Heon Shim
• 김승언(재료연구소 타이타늄연구실) | Seung Eon Kim
• 현용택(재료연구소 타이타늄연구실) | Yong Taek Hyun Corresponding author
• 박찬희(재료연구소 타이타늄연구실) | Chan Hee Park
• 강주희(재료연구소 재료설계분석연구실) | Joo-Hee Kang
• 이용태(재료연구소 타이타늄연구실) | Yong Tai Lee
• 김영욱(한양대학교 에리카공동기기원) | Young Ouk Kim