Effect of Container on the Microstructure and Properties of Powder Metallurgy TiAl Alloys

Abstract:

Pre-alloyed powder of Ti-47Al-2Cr-2Nb-0.15B was prepared by a gas atomization process and powder metallurgy (PM) γ-TiAl alloys were made through a hot isostatic pressed (HIPed) route. The atomized powders were canned in containers, degassed, sealed, and HIPed. Effect of two different canning materials (mild steel and commercial pure titanium (CP-Ti)) on the microstructure and properties of as-HIPed γ-TiAl alloy were discussed. Due to the reaction between mild steel containers and γ-TiAl at relative high temperature (over 1230 °C), the γ-TiAl matrix is contaminated. CP-Ti canned γ-TiAl showed bigger yield and fracture strength than mild steel canned TiAl. PM γ-TiAl alloy parts having complex shape could be manufactured by the near net-shape process.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 604-609
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.604
• Online since: April 2015
• Authors: Jie Wu, Lei Xu*, Zheng Guan Lu, Rui Peng Guo, Yu You Cui, Rui Yang
• Keywords: Ceramic Coatings, Container Material, Gas Atomization, Powder metallurgy, TiAl

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