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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 17 Jan 2018 My Price 8.00

copper–zinc alloys

18.13   From Figure 18.37, estimate the value of  A in Equation 18.11 for zinc as an impurity in copper–zinc alloys.

18.14   (a) Using the data in Figure 18.8, determine the values of r0 and a from Equation 18.10 for pure copper. Take the temperature T to be in degrees Celsius. (b) Determine the value of A in Equation 18.11 for nickel as an impurity in copper, using the data in Figure 18.8. (c) Using the results of parts

(a) and (b), estimate the electrical resistiv- ity of copper containing 2.50 at% Ni at 120°C.

18.15   Determine the electrical conductivity of a Cu–Ni alloy that has a tensile  strength  of 275 MPa (40,000 psi). You will find Figure

7.16 helpful.

18.16   Tin bronze has a composition of 89 wt% Cu and 11 wt% Sn, and consists of two phases

 

 

 

 

 

Composition (at% Zn)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

0                   10                 20                 30

                                       

7

 

 

Text Box: Electrical resistivity (10–8 n – m)6

 

 

5

 

 

4

 

 

3

 

 

2

 

 

1

 

 

0

0                 10                 20                 30

Composition (wt% Zn)

 

Figure 18.37 Room-temperature electrical resistivity versus composition for copper–zinc alloys. [Adapted from Metals Handbook: Properties and Selection: Nonferrous Alloys and Pure Metals, Vol. 2, 9th edition,

H. Baker (Managing Editor), American Society for Metals, 1979, p. 315.]

 

 

 

 

at room temperature: an a phase, which is copper containing a very small amount of tin in solid solution, and an E phase, which con- sists of approximately 37 wt% Sn. Compute

 

Answers

Maurice Tutor
(5)
Status NEW Posted 17 Jan 2018 07:01 PM My Price 8.00

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