Phase Diagrams Report

 Phase Blueprints Report Essay

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Stage Diagrams

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Material Science

Lab #11 Report

Advantages

The purpose of this lab is to obtain the cooling curves for tin, business lead and several alloys of these two precious metals. A period diagram will probably be generated via these cooling curves. Each time a material is heated with the help of energy in a constant price, the temperature of the material will increase linearly with time, offered a phase transformation will not occur. Since temperature in the sample becomes greater than the temperature in the surroundings, the environment will also drop heat(energy). This kind of heat loss depends on the temp difference between the sample as well as the surroundings, and results in a decrease in the web rate that energy is usually added to the sample and a slight convexity in the warming curve. Each time a phase modification occurs during heating, further energy is required to form a brand new phase, as a result the rate of temperature maximize will slow down during this period of phase modification (Figure 1). If the test is genuine metal or has a eutectic composition, the phase alteration will take place at an individual temperature, resulting in a horizontal region in the heat curve (Figure 2).

Physique 1 -- Phase Modification over a sole temperature Figure 2 -- Phase Change over a area When the test is cooled down by high temperature loss for the surroundings, the rate of energy loss depends on the sample's temperature, which results in a concave cooling shape. Phase modification shows up in the cooling curves in a contact form similar to regarding heating curves. Sometimes super cooling is usually evident in the cooling curves (Figure 3).

Figure 3 -- Cooling Shape

Method

Lead-tin alloys are put in electrically heated pots, shown in figure four, with a thermocouple to measure the temperature of each and every sample. The thermocouples will be connected to a great Omega DataLogger Thermometer. The DataLogger just has 4 channels. Thus, the test has to be performed twice to get...


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