| Abstract Scope |
Friction stir processing (FSP) is a high temperature severe plastic deformation (HTSPD) method that can be used to produce nanostructured immiscible alloys and metastable high entropy alloys (HEAs). In this overview, the progress with various metallic systems will be reviewed. In immiscible alloys, the forced mechanical mixing in the intense shear layer produces nanostructured features that are thermally stable. 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. On the other hand, in Sc containing aluminum alloys, the particles undergo coarsening rather than dissolution. Additionally, results on metastable HEAs show ability to create highly interfaced materials. These different examples provides new opportunities of microstructural tailoring using FSP as HTSPD method. |