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The effects of mechanical stress, due to cold rolling, on the triple-point phase equilibrium in the niobium-deuterium system have been investigated using differential scanning calorimetry. Both unstressed and stressed foil samples of niobium-deuterium were analyzed over the temperature range 323 to 398 K. Over this temperature range, niobium-deuterium undergoes several phase changes (depending on the composition of the niobium-deuterium specimen). Differential scanning calorimetry allowed determination of temperature, energy, and compositional characteristics of these phase changes. It has been found that mechanical deformation has a significant effect on all of these characteristics.