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п»їRESULTS AND DISCUSSION

1) From the measurements of heat and time, plot graphs of temperature vrs time (cooling curve) for all the disposition The fresh data taken from the experiment was drawn for the five trials as proven below.

Figure 1: Cooling Contour for Sample A (Pure Lead)

Figure two: Cooling Competition for Test B (Pure Tin)

Figure 3: Cooling Curve intended for Sample C (Pb – 10wt%Sn)

Figure 4: Cooling down Curve pertaining to Sample G (Pb – 40wt%Sn)

Number 5: Air conditioning Curve intended for Sample E (Pb – 62wt%Sn)

2) From these types of curves, identify the liquidus and solidus temperatures as a function of composition Via Fig. one particular to 5, the liquidus and solidus temperature ranges could be obtained by looking with the change in gradient for the various plots. The temperatures for every single composition happen to be shown in the table listed below. Sample

Temperature (вЃ°C)

A

W

C

D

E

Pure Lead

Real Tin

Pb – 10wt%Sn

Pb – 40wt%Sn

Pb – 62wt%Sn

Liquidus Temperature

328

234

297

228

183

Solidus Temperature

328

234

260

183

183

Table you: Experimental liquidus and solidus temperature pertaining to various disposition 3) Compare these ideals of liquidus and solidus temperature to the people extracted from your Lead-Tin period diagram. Touch upon any variant.

From Table 2, the percentage differences to get sample A, B and E are much less than a single per cent to get both liquidus and solidus temperatures. This could be attributed to small impurities and experimental problems, including tuned errors pertaining to the thermocouples, during the test. For test C, there exists a difference of -1. 00% and -6. 47% for the liquidus and solidus temperature correspondingly. This could be related to undercooling and nonuniform heat of the liquid, which could be viewed from slight dip as well as the curvature in the liquidus series. Furthermore, as a result of non-equilibrium cooling of the sample, a non-uniform composition could result and so causing shedding temperature deviation within the grain. For test...



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