Effect of Long-Term Aging on the Evolution of γ' and TCP Phases of a Ni₃Al Based Single Crystal Superalloy

Abstract:

The coarsening behavior of γ' phase and precipitation behavior of TCP phase in a Ni₃Al based single crystal superalloy were investigated by experimental and calculation. The Re-containing and Mo-rich single crystal superalloy used in this study exhibit good high-temperature strength and oxidation resistance. After fully heat-treated, the experimental superalloys were aged at 1050°C and 1150°C for different time periods from 50h to 1000h. The microstructure after thermal exposure was examined by field emission-scanning electron microscopy (FE-SEM). The results indicated that the coarsening behavior of γ' phase agrees well with the typical Lifshitz-Slyozov-Wagner (LSW) theory. After thermal exposure, both the size and the volume fraction of the TCP phase changed perceptibly.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 482-487
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.482
• Online since: March 2016
• Authors: Xin Zhou, Jie Xiao, Yan Ling Pei, Shu Suo Li, Sheng Kai Gong
• Keywords: Long-Term Thermal Exposure, Ni₃Al Base, Single Crystal Superalloy, TCP Phase, γ' Phase

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