Dislocation density evolution upon plastic deformation of Al-Pd-Mn single,quasicrystals

Dislocation density studies have been performed on icosahedral Al-Pd-Mn sin gle quasicrystals after plastic deformation and after subsequent heat treat ment. The deformation tests were carried out at a constant strain rate of 1 0(-5) s(-1) at temperatures between 695 and 820 degrees C. The heat treatme nts were performed at 730 degrees C, corresponding to one of the deformatio n temperatures. The development of the dislocation density during heat trea tment and that during plastic deformation are compared. The experimental da ta are interpreted using a kinetic equation, which describes the evolution of the dislocation density during deformation. Numerical values for the dis location multiplication constant and the annihilation rate for icosahedral Al-Pd-Mn are presented.