Study on the microstructural evolution of different component alloys consisting of B2-NiSc intermetallics

Authors

  • Zhipeng Yuan Materials Science & Engineering College, Henan Polytechnic University, Jiaozuo 454000, People’s Republic of China
  • HongBao Cui Materials Science & Engineering College, Henan Polytechnic University, Jiaozuo 454000, People’s Republic of China
  • Yatao Chang Materials Science & Engineering College, Henan Polytechnic University, Jiaozuo 454000, People’s Republic of China
  • XueFeng Guo Materials Science & Engineering College, Henan Polytechnic University, Jiaozuo 454000, People’s Republic of China

Keywords:

intermetallics, microstructural evolution, second phase, rapid solidification, (Ni2Sc NiSc) eutectic

Abstract

Ni-50%Sc and Ni-51%Sc alloy were prepared with a vacuum arc smelting and water cooled copper mold suction-casting machine. The results showed that the two component alloys consisted of the primary phase B2-NiSc and lamellar (Ni2Sc+NiSc)eutectic due to the loss of Sc duringmelting. Two groups of alloys underwent (970 ?, 72 h) homogenization heat treatment, and spherical or plate shape Ni2Sc particles were dispersed on the B2-NiSc matrix. With the increase of Sc content from50% to 51%, the amount of the second phase in the alloy decreases, the microstructure becomes uniform, and the grain gradually changes from long bar to a spherical particle. According to the Jackson boundary theory, the Jackson factor ? of B2-NiSc =0.5 < 2, so the interface is rough, which explains that the growth pattern of the B2-NiSc phase is anon-faceted growth. It is consistent with the dendritic growth pattern of the B2-NiSc phase, which is observed from the experiment. After a longheat treatment, the number of vacancies decreases and the microstructure became uniform. The loss rate of Sc in rapidly quenched solidification was higher than that after the heat treatment.

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Published

2019-04-15

Issue

Engineering Review, Vol. 39, No. 2

Section

Articles

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