13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- (b) Figure 3. Force–displacement curves at a displacement rate of 0.2 mm/min for the solid fraction ranges from fs = 1.0 – fully solid to fs = 0.97 (a) and from fs = 0.97 to fs = 0.85 (b). Figure 4. Force–displacement curves at a displacement rate of 2 mm/min for solid fractions from fs = 0.99 to fs = 0.9. The evolution of the peak force of the alloy with respect to the temperature is shown in Figure 5. For both displacement rates, the peak force rapidly increases as the temperature is lowered below 475 °C. Therefore, we can argue that the grain coalescence occurs between fs = 0.94 and fs = 0.97. These values are supported by a few other works on different alloys [9, 10]. The temperature range
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