Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Heat Treatment on the Mechanical Properties of a Ti-15Mo-3Nb-3Al-0.2Si Alloy

β-type Ti-14Mo-3Nb-3Al-0.2Si 합금의 열처리 조건에 따른 기계적 특성

  • Kim, Tae Ho (Department of Advanced Materials Engineering, Chungnam National University) ;
  • Lee, Jun Hee (Department of Advanced Materials Engineering, Chungnam National University) ;
  • Hong, Sun Ig (Department of Advanced Materials Engineering, Chungnam National University)
  • 김태호 (충남대학교 응용소재공학과) ;
  • 이준희 (충남대학교 응용소재공학과) ;
  • 홍순익 (충남대학교 응용소재공학과)
  • Received : 2010.09.24
  • Published : 2011.02.25
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Abstract

The mechanical properties of the various heat treatment conditions on Ti-15Mo-3Nb-3Al-0.2Si alloy plates were examined. XRD patterns from the surface of Ti-15Mo-3Nb-3Al-0.2Si were analyzed as a solution-treated Ti alloy has the single-phase ${\beta}$ structure whereas the aged Ti alloys have the ${\beta}$ matrix embedded with ${\alpha}$ needles. High strength (~1500 MPa) with decent ductility (7%) was obtained by the Ti alloy double aged at $300^{\circ}C$ and $520^{\circ}C$ for 8 hours each. The double-aged alloy exhibits the finer structure than the single-aged alloy at $300^{\circ}C$ for 8 hours because of the higher nucleation rate of ${\alpha}$ needles at an initial low aging temperature ($320^{\circ}C$). TEM observation revealed that the fine nanostructure with ${\alpha}$ needles in the ${\beta}$ matrix ensured the excellent mechanical properties in the double aged Ti-15Mo-3Nb-3Al-0.2Si alloy. In the solution treated alloy, the yield drop, stress-serrations and the ductility minimum typically associated with dynamic strain aging can be attributed to the dynamic interaction between dislocations and oxygen atoms. The yield drop and the stress serration were not observed in aged samples because the geometrically introduced dislocations due to phase precipitates suppressed the dynamic strain aging.

Keywords

Acknowledgement

Supported by : 한국연구재단

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