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Microstructure And Creep Deformation Behavior Of A Hierarchical-Precipitate-Strengthened Ferritic Alloy With Extreme Creep Resistance, Gian Song

Doctoral Dissertations

Hierarchical NiAl [nickel-aluminium compound]/Ni₂TiAl [nickel-titanium-aluminum compound] or single Ni₂TiAl-precipitate-strengthened ferritic alloys have been developed by adding 2 or 4 weight percent [wt. %] of Ti [titanium] into a previously-studied NiAl-precipitate-strengthened ferritic alloy. A systematic investigation has been conducted to study the interrelationships among the composition, microstructure, and mechanical behavior, and provide insight into deformation micro-mechanisms at elevated temperatures.

The microstructural attributes of hierarchical or single precipitates are investigated in the Ti-containing ferritic alloys. Transmission-electron microscopy in conjunction with the atom-probe tomography is employed to characterize the detailed precipitate structure. It is observed that the 2-wt.-%-Ti alloy …