Instability of crystallographic orientation in real single crystals

Author(s):  
Wojciech Truszkowski
JOM ◽  
2012 ◽  
Vol 64 (6) ◽  
pp. 664-670 ◽  
Author(s):  
Kwang Seon Shin ◽  
Ming Zhe Bian ◽  
Nguyen Dang Nam

2013 ◽  
Vol 203-204 ◽  
pp. 406-410 ◽  
Author(s):  
Barbara Grzegorczyk ◽  
Wojciech Ozgowicz ◽  
Elżbieta Kalinowska-Ozgowicz

Plastic deformation of solid crystals is a complex process, mostly heterogeneous, due to the simultaneous effect of several deformation mechanisms. A dominating deformation mechanism depends on the properties of the material and external coefficients, viz. temperature, stress and strain rate. The applied Bridgman method permitted to obtain single crystal of the CuZn30 alloy adequate for plastic deformation investigations. Single crystal are characterized by selected crystallographic orientations from various areas of the basic triangle. In order to determine the influence of the crystallographic orientation on the Portevin-Le Chatelier effect selected single crystals were compressed at a temperature of 300°C at a strain rate of 10-3 s-1. Experiments confirmed the effect of the crystallographic orientation axis of CuZn30 single crystals on the observed differences in the intensity of stress oscillation on stress-strain curves.


2011 ◽  
Vol 46 (10) ◽  
pp. 3436-3444 ◽  
Author(s):  
Daniel Weiß ◽  
Tim Gebensleben ◽  
Lisa Diestel ◽  
Lukas Alphei ◽  
Verena Becker ◽  
...  

2016 ◽  
Vol 116 ◽  
pp. 147-151 ◽  
Author(s):  
L.W. Tseng ◽  
Ji Ma ◽  
S.J. Wang ◽  
I. Karaman ◽  
Y.I. Chumlyakov

1951 ◽  
Vol 29 (5) ◽  
pp. 370-381 ◽  
Author(s):  
E. Teghtsoonian ◽  
Bruce Chalmers

Single crystals of high purity tin grown from the melt by a modified Bridgman method are shown to be partitioned into bands, or striations. A difference of orientation exists between the striations such that the lattice of one striation may be brought into coincidence with the lattice of its neighbor by a pure rotation about an axis parallel to the specimen axis. The properties of the striations have been shown to be dependent on both the rate of growth and the crystallographic orientation relative to the direction of heat flow. A tentative explanation of the origin of this effect is advanced in terms of the formation of edge type dislocations from the condensation of vacant lattice sites.


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