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Manual - E1 - Lead Tin Cooling Curves

Manual - E1 - Lead Tin Cooling Curves - NANYANG...

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NANYANG TECHNOLOGICAL UNIVERSITY School of Materials Science & Engineering Second Year Undergraduate Experiment MS2071 Laboratory Laboratory Manual For Experiment E-1 Lead-Tin Cooling Curves Laboratory: E-Learning Studio Location: N4.1-B2-02 Session 2009/2010 1
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2 Nanyang Technological University Second Year Undergraduate Experiment Experiment 1: Lead-Tin Cooling Curves 1. OBJECTIVES The objective of this experiment is to study phase transformations in Lead-tin alloys through the determination of the cooling curves. To understand how phase transformations occur by studying the cooling curves of lead-tin alloys. To relate the phase transformation behaviour to the phase diagram. 2. THEORY The equilibrium behaviour of alloys during heating or cooling can be represented by phase diagrams. Such diagrams are also called equilibrium or constitutional diagrams. The solidification of most alloys occurs as a continuous process over a range of temperature; even after solidification phase, changes may take place. It is possible by plotting temperature against composition to represent graphically the changes that take place during and after solidification. Such knowledge is a useful guide to the casting and heat treatment of alloys. The diagrams deal with phase transformation in alloys phase under equilibrium conditions realized by extremely slow cooling or heating. This condition is rarely achieved in practice, nevertheless, equilibrium diagrams do show the direction in
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