If too slow, time is wasted and time above liquidus
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 experiment was carried out with an Al-7 wt.% Si alloy with superheat of 10% above the liquidus
temperature, as shown in previous articles, as well as the enlarged partial phase diagram of the Al-Si system, which permits a clear visualization of phases and transformation temperatures in the hypoeutectic range of Al-Si alloys [42-44].
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 .
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].
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
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