Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 8.15, Problem 67SEP
Draw an approximate hypothetical phase diagram for two metals that have unlimited solubility in each other with the following information:
Melt temperature of metal A is 1084°C.
Melt temperature of metal B is 1455°C.
At 1300°C, the wt% of metal B in the liquidus alloy is 45%.
At 1300°C the wt% of metal B in the solidus alloy is 57%.
At 1300°C the wt% of metal B in the overall alloy is 53%.
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Use the phase diagrams for Cu-Ni and Cu-Ag systems below to answer the question:
Based on the mechanism, would you expect a solution containing 80 wt% Cu to be stronger if the remaining 20% of the alloy was Ni or Ag? Briefly explain
For two hypotetical materials which have limitless solubility for both in the “liquid” and “solid” states in each other, the following data are listed. Melting Temperatures of material A and B are Tm,A and Tm,B respectively, Liquidus and Solidus curves are circular arcs.
a- Draw the related “Phase Diagram” of Material A and Material B showing the data given and calculated.
b- Calculate/Determine the compositions of phases at T2 , explain the procedure.
c- Calculate/Determine the “percentages” of “phases” of Alloy,2 at T2 , explain the procedure.
Given:
-Tm,A, Celcius =530
-Tm,B, Celcius =830
-T1, Celcius =630
-B percentage of Liquid phase at
T1 =35
-B percentage of Solid phase
at T1 =80
-B percentage of Alloy 2. =60
-T2, Celcius =680
-B percentage of Liquid phase of
Alloy 2 at T2 = to be calculated
-B percentage of Solid phase of
Alloy 2 at T2 = to be calculated
1) Given the following information construct a hypothetical phase diagram formetals A and B between the temperatures of 400 and 800 o C given the followinginformation The two end member components are A and B The bottom axis should given in mol% B with 100 mol% B being on the right sideof the diagram. The melting temperature of metal A is 750 o C. The melting temperature of metal B is 700 o C. One eutectic occurs at 600 o C and 75 mol% B. The maximum solubility of A in B is 15 mol% A, and occurs 600 o C.The maximum solubility of B in A is 10 mol% B and occurs 600 o C.
2) Label all regions on the phase diagram
3) Sketch representations of the equilibrium microstructures for the phase diagramabove, for an A-B alloy of the eutectic composition at 750 and 500 o C
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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