Fig. 2 shows the Heckel plots of the evaluated powders, and their
related constants are listed in Table 2. The values for the constant
k are obtained from the slope of the Heckel plots, with the linearity in
the range of 0.9617–0.9984 for all of the powders evaluated. This strong
linearity indicates that plastic deformation is dominant [25]. The mean
yield pressure (Py), which is the reciprocal of k, can be understood as
the pressure existing when the plastic deformation starts [26]. Thus, a
lower value of P
y indicates a greater plasticity of the materials [27].
The intercept of the plots give the value of the constant A, which is
related to the particle rearrangement before deformation and bonding,