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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.56  No.11 (2015)  >  pp.1905-1910

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The Thermal Stability and Strength of Highly Alloyed Ni3Al

Te-Kang Tsao1), An-Chou Yeh1)
1) Department of Materials Science and Engineering, National Tsing Hua University

In this study the L12 gamma prime phase (based on Ni3Al) has been highly alloyed with Cr, Co, W, and Ta in order to examine the effects on strengthening and thermal stability. The order-disorder transition temperature of gamma prime is decreased with higher alloying content. Thermodynamic calculations show that the ordering enthalpy decreases as the entropy term increases. Conversely, the hardness can be 1.5 times higher comparing to that of a conventional Ni-based superalloy. This indicates that the strengthening effect of designing a gamma prime composition toward higher entropy is significant, due to greater lattice distortion and higher anti-phase boundary energy of gamma prime.

superalloy, gamma prime, thermal stability, hardness

Received: July 24, 2015
Accepted: September 03, 2015 , Published online: October 25, 2015



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