It was observed from pin-on-disc tests that microalloying with Fe and/or Mn is an effective method to enhance the wear resistance of Cu50Zr50 at. % shape memory alloy (SMA) because these elements can promote the martensitic transformation when they are present in certain concentrations. The microstructure of Cu50Zr50 at. % SMA mostly consists of B2 CuZr and partial replacement of Cu by up to 1 at. % Fe and Mn is of interest because they can decrease the stacking fault energy (SFE) of B2 CuZr according to density functional based calculations. A decrease in the SFE means a more effective martensitic transformation. When Cu is partially replaced by 0.5 at. % Fe, there is a decrease of the SFE, from 0.36 J/m2 to 0.26 J/m2, and therefore the highest martensitic transformation upon wear testing is achieved. This results in the highest wear resistance of the Cu50Zr50 at. % SMA, especially for 15 N load, for which the mass loss decreases from 0.0177 g to 0.0123 g. These results are consistent with the low roughness, 0.1870.23 μm, and coefficient of friction, 0.48, obtained when Cu is partially replaced by Fe compared to the values for Cu50Zr50, 0.55 and 0.4510.59 μm, respectively. Observation of the worn surfaces suggest that the more wear resistant alloy is the one containing 0.5 at. % Fe, since the abrasive grooves are the swallowest while the alloy with 0.5 at. % Mn is the second more wear resistant, for which the surface roughness is 0.3010.38 μm. Sliding wear tests on SS304 counterbody indicate that the wear mechanisms are abrasion, adhesion and delamination.
|Publication status||Published - 21 Apr 2022|
|Event||5th International Conference on Materials Research and Nanotechnology ICMRN 2022 - |
Duration: 20 Apr 2023 → 21 Apr 2023
|Conference||5th International Conference on Materials Research and Nanotechnology ICMRN 2022|
|Period||20/04/23 → 21/04/23|