Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 25    No. 7    July 2015

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Microstructural characterization of in situ synthesized TiB in cast Ti-1100-0.10B alloy
Bin-guo FU, Hong-wei WANG, Chun-ming ZOU, Zun-jie WEI

National Key Laboratory for Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, China

Abstract:The as-cast Ti-1100-0.10B alloy was prepared by a vacuum induction-melting technology. The microstructural characterization of in situ synthesized TiB and the interfacial structure of TiB/Ti matrix were systematically investigated. The results demonstrate that the TiB phase precipitates preferably at the prior β grain boundaries. The TiB phase grows along [010] direction with a typical needle-like morphology. The transversal section of TiB is hexagonal, and the interfaces between TiB and the Ti matrix are clean without precipitation phase. The stacking faults are observed on the (100) plane of the TiB phase, which are ascribed to the locations of boron (B) atoms in the crystal structure of TiB and the lattice mismatch energy between TiB and Ti matrix.


Key words: Ti alloy; casting; microstructure; TiB

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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