The influence of carbon and oxygen in the grain boundary on the brittle-ductile transition temperature of tungsten Bi-crystals

1984 ◽  
Vol 18 (7) ◽  
pp. 673-676 ◽  
Author(s):  
E. Smiti ◽  
P. Jouffrey ◽  
A. Kobylanski
Keyword(s):  
Transition Temperature ◽  
Grain Boundary ◽  
Brittle Ductile Transition

The plasticity and cleavage of polycrystalline beryllium II. The cleavage strength and ductility transition temperature

1980 ◽  
Vol 370 (1740) ◽  
pp. 29-39 ◽  
Keyword(s):  
Transition Temperature ◽  
Flow Stress ◽  
Grain Boundary ◽  
Stress Axis ◽  
Second Phase ◽  
Temperature Dependent ◽  
Second Phase Particles ◽  
Cleavage Strength ◽  
Dependent Flow ◽  
Strength And Ductility

For a grain diameter d, the cleavage strength is proportional to d -1/2 , but intercepts the stress axis. Initiation of cleavage in second phase particles of a size that varies suitably with d could produce this relation. More likely, the cleavage strength is determined by the condition for propagation of a microcrack across a grain boundary. An explanation of the stress intercept is given in terms of the probability that the critical microcrack size is an increasing multiple of d as the grains become finer. Directly measured ductility transition temperatures agree with those deduced from the intersection of a temperature dependent flow stress with a temperature independent cleavage strength.

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