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초미세 결정립 Ti- 6Al- 4V 합금의 저온 초소성 거동 = Low Temperature Superplasticity of Ultra-fine Grained Ti-6Al-4V Alloy

제어번호 : 45030200

저자명 : 고영건 ,안병두 ,신동혁 ,이종수

학술지명 : 대한금속·재료학회지(Korean Journal of Metals and Materials)

권호사항 : Vol.42 No.10 [2004]

발행처 : 대한금속재료학회

발행처 URL : http://www.kim.or.kr

자료유형 : 학술저널

수록면 : 790-796(7쪽)

언어 : Korean

발행년도 : 2004년

KDC : 436

주제어 : ECA pressing ,Ultra-fine grain ,Ti-6Al-4V alloy ,Superplasticity

소장기관 :

  • 영남대학교 과학도서관

제공처 : 한국학술정보 한국학술정보

  • 초록
    • Superplasticity of ultra-fine grained (UFG) Ti-6A1-4V alloy processed by equal channel angular (ECA) pressing was investigated with the variation of strain rate and temperature. Initial coarse equiaxed grains (11 μm in diameter) were significantly refined to =0.3 μm without changing volume fraction after 4 times of isothermal ECA pressing at 600℃. Tensile tests of both coarse grained specimens and UFG specimens were performed at temperatures of 600℃, 650℃ and 700℃, respectively, and at strain rates of 10^(-4)/s to 10^(-2)/s. UFG structures exhibited considerably higher elongations than those of coarse grained specimens at the same conditions of temperatures and strain rates. The results indicated low-temperature superplasticity (LTS) could be achieved by using UFG structures. Also, it was found in this study that, in spite of non-equilibrium state due to intense plastic straining, grain size were found to be an important factor in controlling overall superplasticity of UFG structure. A plastic instability during superplastic deformation of UFG Ti-6A1-4V alloy was discussed in relation to Hart's criterion.
      (Received June 2, 2004)
  • 목차
    • Abstract
    • 1. 서론
    • 2. 실험방법
    • 3. 실험결과
    • 4. 고찰
    • 5. 결론
    • 후기
    • REFERENCES