The effect of stress on spinodal decomposition in Cu-15Ni-8Sn alloy was investigated at various temperatures and stresses. As the aging temperature approached the coherent spinodal temperature about 500°C, the anisotropy among the three equivalent <100> modulations of the stress aged specimens became pronounced. The wavelength of the  modulation along the tensile stress axis was smaller than that of the  or  modulation perpendicular to the stress axis. TEM diffraction patterns also showed the anisotropy effect of the applied stress to the composition modulation. A theoretical model based on micromechanics concepts was employed to explain the experimental results.
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Ahn, S., Tsakalakos, T. The Effect of Applied Stress of the Decomposition Cu-15Ni-8Sn Spinodal Alloy. MRS Online Proceedings Library 21, 539–547 (1983). https://doi.org/10.1557/PROC-21-539