scholarly journals Comparative study of the mechanical behavior under biaxial strain of prestrained face-centered cubic metallic ultrathin films

2009 ◽  
Vol 94 (10) ◽  
pp. 101911 ◽  
Author(s):  
Kedarnath Kolluri ◽  
M. Rauf Gungor ◽  
Dimitrios Maroudas
Keyword(s):  
Comparative Study ◽  
Mechanical Behavior ◽  
Ultrathin Films ◽  
Face Centered Cubic ◽  
Biaxial Strain ◽  
Face Centered

Microstructure and Mechanical Behavior of Severely Deformed F.C.C. Metals

2007 ◽  
Vol 567-568 ◽  
pp. 181-184 ◽  
Author(s):  
Jenő Gubicza ◽  
Sergey V. Dobatkin ◽  
Z. Bakai ◽  
Nguyen Q. Chinh ◽  
Terence G. Langdon
Keyword(s):  
Dislocation Density ◽  
Yield Strength ◽  
Shear Modulus ◽  
Mechanical Behavior ◽  
Boundary Structure ◽  
Face Centered Cubic ◽  
Angular Pressing ◽  
Maximum Value ◽  
Grain Boundary Structure ◽  
Face Centered

The correlation between the microstructure and the mechanical behavior of ultrafinegrained face centered cubic (f.c.c.) metals processed by equal-channel angular pressing (ECAP) was studied. It was found that the maximum value of the yield strength obtained at high strains is determined by the shear modulus and the saturation value of the dislocation density according to the Taylor equation. It was also revealed that the value of the parameter α in this equation decreases with decreasing stacking fault energy, indicating the effect of different geometrical arrangements of dislocations in the grain boundaries. In addition, it was shown that for ECAP processed Cu, the ductility decreases with increasing strain but at extremely high strains the ductility is partially restored due to a recovery of the grain boundary structure.

Void nucleation in biaxially strained ultrathin films of face-centered cubic metals

2007 ◽  
Vol 90 (22) ◽  
pp. 221907 ◽  
Author(s):  
Kedarnath Kolluri ◽  
M. Rauf Gungor ◽  
Dimitrios Maroudas
Keyword(s):  
Ultrathin Films ◽  
Void Nucleation ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Face Centered
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