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NiTi Powder Sintering from TiH2 Powder: An In Situ Investigation

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For the first time, an in situ observation of NiTi powder sintering from TiH2 powder is presented, using an environmental scanning electron microscope. It is found that hydrogen release during dehydrogenation significantly affects the sintering behavior and resultant microstructure. In comparison to the blended Ni/Ti powders, dehydrogenation occurring in the Ni/TiH2 blend leads to higher porosity, less densification, and a lower degree of chemical homogenization after being sintered at 1173 K (900 °C) for 1 hour.

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The authors acknowledge the financial support from Ministry of Business, Innovation, and Employment (MBIE), New Zealand. GC thanks China Scholarship Council (CSC) for providing a doctoral scholarship for him to study at the University of Auckland. The authors are grateful to the technical assistance from Professor Yuehui He at Central South University China.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, The University of Auckland, Private Bag 92019, Auckland, 1142, New Zealand

    Gang Chen (Ph.D. Candidate) & Peng Cao (Senior Lecturer)

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  1. Gang Chen
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  2. Peng Cao
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Correspondence to Peng Cao.

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Manuscript submitted August 9, 2013.

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Chen, G., Cao, P. NiTi Powder Sintering from TiH2 Powder: An In Situ Investigation. Metall Mater Trans A 44, 5630–5633 (2013). https://doi.org/10.1007/s11661-013-2078-z

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