Fracture behaviour of Cu-Al-Ni shape memory alloys obtained by powder metallurgy
Keywords:Shape memory alloys, Powder metallurgy, Cu-Al-Ni, Fracture, Subboundaries,
Polycrystalline Cu-Al-Ni shape memory alloys have been scarcely employed for technological applications due to their high brittleness. The development of a new elaboration technique based on powder metallurgy has recently overcome this problem, through the improvement of the ductility of the produced alloy without affecting its shape memory properties. The fracture behaviour of an alloy obtained using this elaboration technique has been studied by means of Scanning Electron Microscopy and mechanical testing. The results show a ductile fracture with a maximum strain close to 13%, which is the best fracture behaviour obtained for Cu-Al-Ni polycrystals. The microstructure of such alloy has been studied by means of Transmission Electron Microscopy, showing a poligonyzed structure in which martensite plates passing through the subboundaries easily.
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