Rajiv S. Mishra¹; ¹University of North Texas

Friction stir processing (FSP) is a high temperature severe plastic deformation (HTSPD) method that can be used to process immiscible alloys. Forced mechanical mixing in the intense shear layer produces nanostructured features that are thermally stable. In this overview, the progress with Cu-based binary and ternary immiscible alloys have been reviewed. Remarkably, the Cu-Ag-Nb immiscible system displayed exceptional thermal stability up to 500ºC. Initial results show that the approach is amenable to manipulation of matrix and the Cu-Al-Nb system shows low stacking fault energy matrix with thermally stable nanostructures. Implications of these on the high temperature performance will be discussed. Solid state processing of such nanostructured alloys using FSP as HTSPD method opens a new domain not easily accessible by other processing techniques.