Aluminum is initially melted at room temperature, 50°C above its
melting temperature. Once this temperature is reached, it is poured into an open mold
to form an ingot and allowed to cool in the environment until reaching a temperature equal to
50°C above ambient temperature. Determine:
a. The mathematical expression that describes the heat exchange in each of the
stages of this process.
b. If we assume that 𝑐𝑝𝑙 = 𝑐𝑝𝑠
, and we neglect the volumetric changes of the piece,
determine how much heat was exchanged in J during this process, if the final piece
It has the following dimensions: 20 cm × 10 × cm × 100 cm.
c. Draw the t vs t diagram for this process.
d. How would this diagram change if instead of aluminum, a metal was used as the metal?
aluminium alloy?
and. Describe how the formation of grains would be if it is a sand mold.
F. The mathematical expression to find the solidification time if it is a
metal mold. What factors affect the change between a sand mold and a
metal mold?