Study of Stress Relaxion in Ni3Ge Single Crystals with Anomalous Temperature Strengthening

2014 ◽  
Vol 1013 ◽  
pp. 49-53
Author(s):  
Vladimir Starenchenko ◽  
Yuliya Solov'eva ◽  
Svetlana Starenchenko ◽  
Artem Solov'ev
Keyword(s):  
Stress Relaxation ◽  
Strain Rate ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Anomalous Temperature Dependence ◽  
Anomalous Temperature

This paper presents the results of a study of stress relaxation in Ni3Ge single crystals with the L12 structure oriented along the [001] axis. The anomalous temperature dependence of the strain rate at relaxation has been determined.

Yield Stress Reversibility and the Operation of Frank-Read Sources in Li2 Alloys in the Anomalous Regime For (111) Slip

1994 ◽  
Vol 364 ◽  
Author(s):  
S. S. Ezz ◽  
P. B. Hirsch
Keyword(s):  
Strain Rate ◽  
Temperature Dependence ◽  
Yield Stress ◽  
Edge Dislocation ◽  
Anomalous Temperature Dependence ◽  
Successful Operation ◽  
Anomalous Temperature ◽  
Small Strains ◽  
Edge Dislocations ◽  
Is Strain

AbstractThe yield stress τy at small strains (≈ 0.01%) is strain rate independent, and has the same anomalous temperature dependence as that of the 0.2% strain. τy is considered to be the stress at which Frank-Read sources operate in a virgin crystal. For successful operation, τy must exceed the stress τs at which screws propagate dynamically through the crystal, and the source dislocation must pass rapidly through the unstable Frank - Read configuration. This can be achieved by the bowing edge dislocation overcoming local obstacles before reaching that configuration. Loops elongated along the screw direction are expected to be formed in the microstrain region. Under certain conditions such loops are unstable on unloading, thereby generating long edge dislocations which can operate successfully as sources at low but not at high temperatures, explaining the reversibility phenomenon.

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