Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Hafnium, Boron and Zirconium on the Ductility of Ni$_3$(Al, Fe) Intermetallic Compounds

  • Lim, S.H. (Department of Electronic Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • No, J.Y. (Department of Electronic Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • No, K.S. (Department of Electronic Materials Science and Engineering, Korea Advanced Institute of Science and Technology) ;
  • Wee, D.M. (Department of Electronic Materials Science and Engineering, Korea Advanced Institute of Science and Technology)
  • Published : 1992.08.01
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Abstract

Effects of hafnium, boron and zirconium on the ductility of Ni$_3$(Al, Fe) intermetallic compounds were studied using tensile test and SIMS analysis. Ni$_3$(Al, Fe) alloy with 0.1 at.% Hf, 0.05 at.% B and 0.1 at.% Zr additions showed maximum elongations of about 30% at 300K, 10% at 300K and 14% at 473K, respectively. The fracture mode of the alloy without the additive was the mixture of intergranular and transgranular fractures, but the addition of Hf, Zr or B changed the fracture mode to transgranular only. SIMS analysis showed that the beneficial effects of Hf, Zr or B segregation on the grain boundary strength are consistent with the grain boundary cohesion theory.

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