In situ neutron diffraction study of internal stresses in 60 % Mn -40 % Cu alloy introduced by ageing

Spinodal decomposition of solid solution in the 60 at.% Mn - 40 at.% Cu alloy was observed at the temperatures of decomposition (380 – 420 °C) using the neutron diffraction method in situ. The contribution of residual stresses of third type introduced by further cooling of alloy and, correspondingly, martensitic tranformation is estimated. The relatively small value of stresses of third type introduced by martensitic transformation is revealed. Appearance of magnetic superstructural reflexes typical for antiferromagnetic ordered structure is noted.