Elastic Yielding after Cold Drawing of Ductile Polymer Glasses

2014 ◽  
Vol 47 (11) ◽  
pp. 3661-3671 ◽  
Author(s):  
Shiwang Cheng ◽  
Shi-Qing Wang
Keyword(s):  
Cold Drawing ◽  
Polymer Glasses ◽  
Elastic Yielding ◽  
Ductile Polymer

Microstructure Development in a High Current Density NbTi Superconducting Composite

1985 ◽  
Vol 43 ◽  
pp. 186-189
Author(s):  
P. J. Lee ◽  
D. C. Larbalestier
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Cold Drawing ◽  
Heat Treatments ◽  
Grain Structure ◽  
Fine Grain ◽  
Boundary Film ◽  
Quantitative Basis ◽  
Cold Worked ◽  
Very High

Several features of the metallurgy of superconducting composites of Nb-Ti in a Cu matrix are of interest. The cold drawing strains are generally of order 8-10, producing a very fine grain structure of diameter 30-50 nm. Heat treatments of as little as 3 hours at 300 C (∼ 0.27 TM) produce a thin (1-3 nm) Ti-rich grain boundary film, the precipitate later growing out at triple points to 50-100 nm dia. Further plastic deformation of these larger a-Ti precipitates by strains of 3-4 produces an elongated ribbon morphology (of order 3 x 50 nm in transverse section) and it is the thickness and separation of these precipitates which are believed to control the superconducting properties. The present paper describes initial attempts to put our understanding of the metallurgy of these heavily cold-worked composites on a quantitative basis. The composite studied was fabricated in our own laboratory, using six intermediate heat treatments. This process enabled very high critical current density (Jc) values to be obtained. Samples were cut from the composite at many processing stages and a report of the structure of a number of these samples is made here.

On the measurement of the width of the distribution of relaxation times in polymer glasses

Polymer ◽  
2002 ◽  
Vol 43 (2) ◽  
pp. 351-355 ◽  
Author(s):  
S Montserrat ◽  
J.M Hutchinson
Keyword(s):  
Relaxation Times ◽  
Polymer Glasses

Polymer glasses and oxide glasses

1980 ◽  
Vol 42 (1-3) ◽  
pp. 119-142 ◽  
Author(s):  
D.R Uhlmann
Keyword(s):  
Oxide Glasses ◽  
Polymer Glasses
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