MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
The Thermal Stability and Strength of Highly Alloyed Ni3Al
Te-Kang TsaoAn-Chou Yeh
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2015 Volume 56 Issue 11 Pages 1905-1910

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Abstract

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.

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© 2015 The Japan Institute of Metals and Materials
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