Abstract
Cu-Al-Ni alloys with composition close to Cu3Al show pseudoelasticity associated with transformations among four martensitic phases, γ1', β1' β1'', α1'. The crystallographic information was obtained by neutron diffraction techniques using the four-circle neutron diffractometer at Researcch Reactor Institute of Kyoto University, KUR, Japan. A small tensile jig with a load cell and an extensometer was attached for generating high uniaxial stress. Quadrant slit devices were inserted into the neutron beam path for accurate measurement of diffracting conditions. Strains as second rank tensors were described as a function of hysteresis and stress between 50 and 460 MPa.
