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2012•Transactions on Electrical and Electronic MaterialsOpen access

Thermal Stability of the R Phase of a Rapidly Solidified Ti-47.3Ni (at%) Alloy

Hyo-jung Moon, Su-jin Chun, Tae-Hyun Nam, Yinong Liu, Hong Sun Yang, Yeon-Wook Kim

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Abstract

Transformation behavior of rapidly solidified Ti-47.3Ni (at%) alloy ribbons and thermal stability of the R phase in the ribbons were investigated by means of differential scanning calorimetry (DSC), X-ray diffraction, and transmission electron microscopy. Rapidly solidified Ti-47.3Ni alloy ribbons showed the two-stage B2-R-B19' martensitic transformation behavior. The B2-R transformation in the ribbons was observed even after annealing at 1,223 K, which was attributed to the fact that a specific orientation relationship between $Ti_2Ni$ and matrix in the ribbons is maintained after annealing at 1,223 K. The DSC peak temperature of the B2-R transformation ( $T_R^*$ ) decreased with raising annealing temperature, which was attributed to the increased volume fraction of $Ti_2Ni$ , thus causing an increased Ni content in the matrix.

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Transformation behavior of rapidly solidified Ti-47.3Ni (at%) alloy ribbons and thermal stability of the R phase in the ribbons were investigated by means of differential scanning calorimetry (DSC), X-ray diffraction, and transmission electron microscopy. Rapidly solidified Ti-47.3Ni alloy ribbons showed the two-stage B2-R-B19' martensitic transformation behavior. The B2-R transformation in the ribbons was observed even after annealing at 1,223 K, which was attributed to the fact that a specific orientation relationship between $Ti_2Ni$ and matrix in the ribbons is maintained after annealing at 1,223 K. The DSC peak temperature of the B2-R transformation ( $T_R^*$ ) decreased with raising annealing temperature, which was attributed to the increased volume fraction of $Ti_2Ni$ , thus causing an increased Ni content in the matrix.

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Available abstract

Transformation behavior of rapidly solidified Ti-47.3Ni (at%) alloy ribbons and thermal stability of the R phase in the ribbons were investigated by means of differential scanning calorimetry (DSC), X-ray diffraction, and transmission electron microscopy. Rapidly solidified Ti-47.3Ni alloy ribbons showed the two-stage B2-R-B19' martensitic transformation behavior. The B2-R transformation in the ribbons was observed even after annealing at 1,223 K, which was attributed to the fact that a specific orientation relationship between $Ti_2Ni$ and matrix in the ribbons is maintained after annealing at 1,223 K. The DSC peak temperature of the B2-R transformation ( $T_R^*$ ) decreased with raising annealing temperature, which was attributed to the increased volume fraction of $Ti_2Ni$ , thus causing an increased Ni content in the matrix.

Key concepts: Materials science, Alloy, Differential scanning calorimetry, Annealing (glass), Transmission electron microscopy, Volume fraction, Diffusionless transformation, Thermal stability

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