|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Microstructures and Mechanical Properties of Ultrafine Grained Ni Based Superalloy Matrix Nanocomposites Fabricated by Powder Metallurgy Route
||Tian Xia, Deliang Zhang, Jiantao Liu, Yiwen Zhang
|On-Site Speaker (Planned)
Ultrafine grained Ni based superalloy matrix nanocomposites reinforced by Y2O3 nanoparticles were fabricated by high energy mechanical milling of Ni base superalloy machining chips or powders together with Y2O3 nanoparticles followed by thermomechanical powder consolidation through powder compact sintering and hot extrusion. The purpose of this study is to develop new type of high temperature materials based on ceramic nanoparticle stabilization of ultrafine grain structure and grain boundary strengthening. The microstructures of the consolidated samples were characterized and their tensile mechanical properties and fracture behavior at room and elevated temperatures were measured and studied. The contributions of grain boundary strengthening, nanoparticle strengthening and other strengthening mechanisms such as solid solution strengthening and gamma prime phase strengthening are analyzed. The roles of inperparticle boundaries in controlling the room and elevated temperature ductility of the consolidated material are discussed.
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