If too slow, time is wasted and time above
liquidus (TAL) extended.
Figure 7 gives the
liquidus of the samples compared with the melting temperatures and the breakpoint temperatures, which indicates that the measurement and the calculation are consistent.
The measured solidification range for the bismuth-containing alloy was approximately 90[degrees]F (50[degrees]C) greater than the leaded alloy solidification range and approximately 81[degrees]F (45[degrees]C) smaller than the lead/bismuth free alloy The
liquidus of the bismuth containing alloys was lower than both the leaded and lead/bismuth free alloys.
Property Value (a) Density 750/(0.001 (T- 319.15) + 1) kg/[m.sup.3] (b) Specific heat 3100 J/kgK (a) Solidus thermal 0.21 W/mK conductivity (a)
Liquidus thermal 0.12 W/mK conductivity (a) Viscosity 0.001 exp (-4.25 + 1790/T) Ns/[m.sup.2] (b) Latent heat 166000 J/kg (b) Solidus temperature 322.7 K (b)
Liquidus temperature 327.6 K (a) Reference [18].
one of the key characteristics relevant to semi-solid processing is the width of the interval between the solidus and
liquidus. The interval recommended specifically for minithixoforming is 10-30% [5, 6].
The
liquidus and solidus interface position during the freezing process for both parabolic and hyperbolic models are shown in Figure 4 and Figure 5 respectively.
It is a continuous casting process that works by applying a low superheat to the metal at a uniform temperature near to or just above the
liquidus temperature.