|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||The Effects of Refractory Element Addition on the Long Term Stability and Microstructural Characteristics of Nickel-Based Superalloys
||Rasim Eris, M. Vedat Akdeniz, Amdulla O. Mekhrabov
|On-Site Speaker (Planned)
The long term stability of L<SUB>12 </SUB>type ordered γ’ precipitates in the severe environmental conditions is deeply bound up with ordering characteristics and coherency between γ-γ’ interfaces. It is attributed that higher temperature capability can be sustained by adding distinct refractory elements since they shift phase transformation temperatures to higher level. Thus, in the current work, the effects of refractory X elements (where X= Mo, Nb, Ta and W) on the ordering characteristics, solidification structures and phase stability of the Ni<SUB>0.8</SUB>Al<SUB>0.15</SUB>X<SUB>0.05</SUB> alloy systems will be presented. Furthermore, subsequent heat treatment including different aging times will be applied to determine the development of optimal coherency between constituent phases. The relationship between long term stability and microstructural characteristics of the present phases which is critical for the design and development of Nickel-based superalloys will be emphasized.
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