The effect of temperature on pseudoelastic cycling of Cu-Zn-Al single crystals

J. MALARRIA , M. SADE

SCRIPTA METALLURGICA ET MATERIALIA

Pergamon Press Ltd

Lugar: Elmsford; Año: 1994 vol. 30 p. 241 - 246

0956-716X

Fatigue, due to pseudoelastic  transformations,  has  been  studied  by  several researchers during the last few years. A transition between an ordered bcc phase (beta) and a 18R structure is  found  in  single  crystals  of  Cu-Zn-Al  of e/a~=~1.48.  It consists in the formation of  martensite  (M),  when  a  stress  is applied  on the beta  phase,  and  in the  retransformation  to  the  original structure after unloading, giving rise to pseudoelastic behavior. Repetition  of this process induces changes in the material, which finally leads  to  fracture. Understanding of the evolution of materials during cycling should be the first step in controling fatigue in these materials.