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6. Factors influencing the properties of ECAP-deformed materials
6.1 Internal die angle
Figure 8 shows the theoretical equivalent strain in ECAP (as predicted by equation (2) ) as a function of the number of passes N (ranging from 1 to 16, with a step of 1) for 5 values of the internal angle Φ of the die (90°, 112.5°, 120°, 135° and 157.5°) with an external angle Ψ fixed at 20°. It is clearly shown that the equivalent deformation increases with the number of passes. For a given number of passes, it appears that equivalent...
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