Title: Mechanical properties of TiB particulate reinforced Ti₂A1Nb intermetallics produced by prealloyed powder metallurgy method

Authors: Satoshi Emura, Masuo Hagiwara

Addresses: National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan. ' National Research Institute for Metals, 1-2-1 Sengen, Tsukuba-city, Ibaraki 305-0047, Japan

Abstract: Ti₂A1Nb intermetallics, based on the orthorhombic (O) phase, have a higher strength-to-density ratio and better high-temperature ductility than conventional titanium aluminides, such as TiAI and Ti₃3A1. In this study, TiB particulate-reinforced Ti₂A1Nb intermetallic alloy was prepared using the prealloyed powder metallurgy method. Ti-23.5A1-25.3Nb (mol%) spherical powder (under 150 µm) with 6.5mass% TiB particulate was produced by the Ar gas atomizing process. The powder was poured into a steel can until full, compacted by hot isostatic pressing (HIP), rolled into a bar and heat-treated. Microstructural observation, high-temperature tensile testing and creep testing were performed, and the results were compared to those of an unreinforced matrix.

Keywords: orthorhombic phase; intermetallics; particulate composites; prealloyed powder metallurgy; tensile strength; creep; hot isostatic pressing; microstructure; high temperature tensile testing; creep testing; ductability.

DOI: 10.1504/IJMPT.2001.005401

International Journal of Materials and Product Technology, 2001 Vol.16 No.1/2/3, pp.103 - 108

Published online: 01 Oct 2004 *

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