Nickel aluminium bronze (NAB) was subjected to equal channel angular pressing (ECAP) at 400 A degrees C for up to 4 passes in routes BA and C, respectively, followed by isothermal heat treatment with a view to improving the kappa phase structures and tensile properties. The lamellar kappa III structure was completely broken after 4 passes in route BA although route C was less efficient. Spheroidisation and coarsening of the highly deformed kappa III continued during heat treatment especially at a parts per thousand yen600 A degrees C. At 800 A degrees C, both the lamellar structure and the fine kappa IV particles transformed completely into a coarse globular morphology with no distinction between the primary and eutectoid alpha. Significant increases in strength were achieved by ECAP, reaching a maximum yield strength of 960 MPa with a good ductility of similar to 14 %. Heat treatment after ECAP was shown to considerably improve tensile ductility to > 30 % while keeping the strength high at similar to 700 MPa, a significant enhancement compared to the as-received NAB.