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If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.
At the eutectic point (e) the eutectic reaction proceeds at a constant temperature as ________
A 34.6% Pb-Sn alloy is cooled just below the eutectic temperature (183°C). What is the fraction of proeutectic α and eutectic mixture (α+β)?
In the hypothetical phase diagram, the melting point of each pure component is. 1000 K and the eutectic temperature is 800 K. The eutectic is located at the equi-atomic composition. The maximum solid solubility in α-phase is given by the mole fraction, Ne = 0.1.
The freezing range (in K) of the alloy with composition, Ne = 0.1 is
Physical Metallurgy mcq question image
A liquid alloy of the eutectic composition (L) undergoes the eutectic reaction to give α and β phases of compositions a and b respectively. The ratio of the relative amounts of α and β phases is
Eutectic AI-Sialloys can be modified by small additions of
There are a lot of limitations on the castings produced by the centrifuge castings.
Faster and uneven cooling of hot casting affects the castings badly or may cause several defects in the castings.
Tumbling method, for cleaning of sand and unwanted fins from the castings, can be used for thin castings with fragile or overhung segments.
The chances of defects in the castings by cold chamber die casting are more than the castings produced by hot chamber die casting.