HW_CH_10 - IE 320 - Spring 2003 Homework Ch. 10...

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Unformatted text preview: IE 320 - Spring 2003 Homework Ch. 10 Introduction to Materials Science 10.1 Cite three variables that determine the microstructure of an alloy. 10.10 Below is a portion of the H2O–NaCl phase diagram: (a) Using this diagram, briefly explain how spreading salt on ice that is at a temperature below 0C can cause the ice to melt. (b) What concentration of salt is necessary to have a 50% ice–50% liquid brine at -10 C? 2 1 IE 320 - Spring 2003 Introduction to Materials Science 10.15 A magnesium–lead alloy of mass 5.5 kg consists of a solid α phase that has a composition that is just slightly below the solubility limit at 200 C. (a) What mass of lead is in the alloy? (b) If the alloy is heated to 350 C, how much more lead may be dissolved in the α phase without exceeding the solubility limit of this phase? 10.26 For alloys of two hypothetical metals A and B, there exist an α , A-rich phase and a β , B-rich phase. From the mass fractions of both phases for two different alloys, which are at the same temperature, determine the composition of the phase boundary (or solubility limit) for both α and β phases at this temperature. 3 Introduction to Materials Science 10.41 What is the principal difference between congruent and incongruent phase transformations? 10.50 Compute the mass fractions of α ferrite and cementite in pearlite. 10.63 Compute the maximum mass fraction of proeutectoid cementite possible for a hypereutectoid iron–carbon alloy. 10.68 The mass fraction of eutectoid ferrite in an iron–carbon alloy is 0.82. On the basis of this information, is it possible to determine the composition of the alloy? If so, what is its composition? If this is not possible, explain why.. 4 2 ...
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This note was uploaded on 03/27/2010 for the course ES 162 taught by Professor Ang during the Spring '10 term at Yeditepe Üniversitesi.

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HW_CH_10 - IE 320 - Spring 2003 Homework Ch. 10...

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