Ni-Co-Mn-Sn-Cu alloys were sintered from elemental powders at a temperature of 1050 degrees C for 24 h. The resulting microstructures and physical properties were characterised by differential scanning calorimetry, X-ray diffraction, optical/electron microscopy and SQUID magnetometry. The use of the alloys in energy conversion was satisfactorily tested. The new alloys exhibited a distinct martensitic transformation when cooled to room temperature. The presence of Cu in the powders moved the transformation temperature toward a higher value. The findings of this study demonstrate that the powder processing could be used to replace time-consuming arc/induction melting process in the development of high performance Heusler alloys at a lower cost. (C) 2017 Elsevier B.V. All rights reserved.