Anomalies in the curve of critical shear stress versus temperature for single crystals of certain iron-chromium-nickel alloys at low temperatures

1976 ◽  
Vol 8 (2) ◽  
pp. 198-201
Author(s):  
L. V. Skibina ◽  
V. Ya. Il'ichev ◽  
E. M. Medvedev ◽  
V. A. Lototskaya
Keyword(s):  
Shear Stress ◽  
Single Crystals ◽  
Low Temperatures ◽  
Nickel Alloys ◽  
Critical Shear Stress ◽  
Iron Chromium Nickel Alloys ◽  
Iron Chromium

scholarly journals The critical shear stress of mercury single crystals

1937 ◽  
Vol 163 (912) ◽  
pp. 34-53 ◽  
Keyword(s):  
Plastic Deformation ◽  
Shear Stress ◽  
Melting Point ◽  
Single Crystal ◽  
Single Crystals ◽  
Critical Shear Stress ◽  
Impurity Content ◽  
Thermal Agitation ◽  
Plastic Yield ◽  
Metal Single Crystals

The influence of very small quantities of impurity on the critical shear stress of metal single crystals has an important bearing on the mechanism of their plastic deformation. For investigations in this field, mercury is a very suitable metal: its impurity content can easily be reduced to an extremely low level (Hulett 1911) and it contains no dissolved gases (Hulett 1911). Also, as first pointed out by Andrade (1914), single crystal wires of this metal can be prepared without difficulty. The low melting point of mercury (-38∙8° C.) is far from being a disadvantage. The crystals can be maintained at -60° C., and at a temperature so near the melting point the thermal agitation may be expected to accentuate phenomena not observable at lower temperatures, if such agitation plays the important part in the mechanism of glide ascribed to it (Taylor 1934; Polanyi 1934; Orowan 1934). As a possible instance of this, the experiments to be described have revealed the existence of a preliminary “set” preceding the true plastic yield. Widely differing forms of slip band have also been observed, and are described elsewhere (Greenland 1937). It is hoped that these results will throw further light on the mechanism of glide.

The mechanical behaviour of single crystals of metals, in particular copper

1957 ◽  
Vol 240 (1222) ◽  
pp. 304-320 ◽  
Keyword(s):  
Shear Stress ◽  
High Temperature ◽  
Single Crystals ◽  
Mechanical Behaviour ◽  
Critical Shear Stress ◽  
Deformation Bands ◽  
Hexagonal Metals

With single crystals of copper, measurements have been made on the variation of the amount of easy glide with the orientation of the crystal axes relative to the direction of tension. At —180° C it has been shown that this variation can be quantitatively expressed by a specific hardening on the active glide planes, which does not exist for the latent glide planes, and a general hardening which applies to both active and latent glide planes. This is compared with the behaviour of hexagonal metals. The occurrence of double glide is analyzed. The variation of glide properties with temperature has been measured for one particular orientation, and the coefficient of specific hardening shown to be roughly independent of temperature. The critical shear stress is also very little affected by temperature, but depends somewhat on orientation. The glide behaviour at high temperature has been found to be influenced largely by the occurrence of deformation bands. A few measurements have been made on gold.

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