Microstructural characteristics of directionally solidified Ni‐43Ti‐7Al alloys
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that a NiTi+Ti2Ni anomalous eutectic structure is formed in intercellular regions of directionally solidified samples withdrawn at 20 and 100 μm s−1. However, in the sample withdrawn at 2 μm s−1, Ti2Ni phases represent strip and liquid droplet morphologies in the intercellular region.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.
Document Type: Original Article
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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