|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical and Creep Behavior of Advanced Materials: A SMD Symposium Honoring Prof. K. Linga Murty
||On the Creep Behavior of Dual-Scale Particle Strengthened Nickel Based Alloy
||Aniket Dutt, Somayeh Pasebani, Indrajit Charit, Rajiv S. Mishra
|On-Site Speaker (Planned)
A dual-scale particle strengthened Ni-20Cr based alloy was developed via mechanical alloying followed by spark plasma sintering. Approximately 1.2 wt.% nano-yttria and 5 wt.% sub-micron alumina were added to the Ni-20Cr matrix to improve the high temperature creep strength through dispersion strengthening mechanism and load transfer mechanism, respectively. Creep tests were conducted on three alloy systems: Ni-20Cr, Ni-20Cr-1.2Y2O3, and Ni-20Cr-1.2Y2O3-5Al2O3 (wt.%) at 800 oC and 100 MPa. Ni-20Cr-1.2Y2O3-5Al2O3 exhibited the highest creep resistance with minimum creep rate of ~2.3×10-9 s-1 under conditions of 100 MPa and 800oC. While major contribution towards high creep strength was generated from dispersion strengthening, significant creep resistance in Ni-20Cr-1.2Y2O3-5Al2O3 alloy implied effectiveness of the dual-scale particle strengthening mechanism. Transmission electron microscopy, 3D atom probe tomography and nano-indentation analysis were used to understand the correlation between the microstructural distribution of nano-Y2O3 and sub-micron Al2O3 particles and high temperature mechanical properties of Ni-20Cr based alloys.
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