Authors: Zhou, L; Zheng, L J; Zhang, H R; Zhang, H

Source: Materials Science and Technology, Volume 28, Number 8, August 2012 , pp. 994-999(6)

Publisher: Maney Publishing

Abstract:

Ni‐43Ti‐7Al (at-%) alloy was directionally solidified at different withdrawal rates (2, 20 and 100 μm s⁻¹) and a constant temperature of 1550°C by liquid metal cooling method. Results show that as the withdrawal rate decreases from 100 to 2 μm s⁻¹, the cellular arm spacing increases from 39·5 to 126 μm, the size of Ti₂Ni and the stability of the liquid/solid interface also increase, while the volume fraction of Ti₂Ni decreases from 3·1 to 0·9%. Moreover, microstructural analysis reveals that a NiTi+Ti₂Ni anomalous eutectic structure is formed in intercellular regions of directionally solidified samples withdrawn at 20 and 100 μm s⁻¹. However, in the sample withdrawn at 2 μm s⁻¹, Ti₂Ni phases represent strip and liquid droplet morphologies in the intercellular region. Finally, the possible explanation to the change of microstructure is discussed.

Keywords: Ti2Ni phase; NiTi?Al alloy; Ti₂Ni phase; Microstructure; NiTi?Al alloy; Oxygen

Document Type: Original Article

DOI: http://dx.doi.org/10.1179/1743284712Y.0000000048

Affiliations: Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Publication date: 2012-08-01

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