Microstructure and mechanical properties of neutron irradiated TiNi shape memory alloy

Microstructure, mechanical properties and transformation temperature of neu tron irradiated TiNi shape memory alloy have been investigated, The doses w ere on the order of 10(20) to 10(23) n/m(2). All irradiations were performe d below 423 K. Amorphization was confirmed by TEM after the irradiation of 1.2 x 10(23) n/m(2). The recovery behavior of the applied strain was drasti cally changed after the irradiation. The DTA peak slightly shifted to lower temperature and vanished. These results indicate that amorphous phase domi nates the suppression of the martensitic transformation, and causes the cha nge in the mechanical properties. (C) 1999 Elsevier Science B.V. All rights reserved.