(Answered)-Please answer no 3 question: In an ionic crystal, the slip planes

Please answer no 3 question:

In an ionic crystal, the slip planes belong to {110} form and the slip directions to the family. How many independent slips systems are present in this structure? Will the crystal be ductile or brittle? Please refer to no 3 on the diagram

MSE 251 PROBLEM SET 6

 

 

DUE: May 5, 2016

 

 

1. Hexagonal close-packed zinc slips only by basal plane slip. A zinc single crystal is oriented so

 

that the normal to its slip plane makes an angle of 60o with the tensile axis. If the three slip

 

directions have angles of 38o, 45o and 84o with respect to the tensile axis, and the critical

 

resolved shear stress for the material is 2.3 MPa determine the tensile stress at which plastic

 

deformation commences. 10 pts.

 

2. Convert the tensile stress-strain curve of the copper single crystal with a [123] orientation (see

 

Fig. 4.5 of Courtney reproduced in the next page) into a shear stress-shear strain curve. 10 pts.

 

3. In an ionic crystal, the slip planes belong to {110} form and the slip directions to the <1-10>

 

family. How many independent slips systems are present in this structure? Will the crystal be

 

ductile or brittle? Prove using the method of solution to the sample problem given in class.

 

10 pts.

 

 



 

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