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Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.01 vteřin. 
Creep Behaviour and Microstructure of Ultrafine Grained Iron Processed by ECAP
 Král, Petr ; Dvořák, Jiří ; Kvapilová, Marie ; Svoboda, Milan ; Sklenička, Václav
Pure iron (99.99%) was subjected to equal-channel angular pressing (ECAP) with a die having an internal channel of 90°. The subsequent extrusion passes were performed by route A up to 4 passes. The microstructures of UFG iron were investigated using EBSD (electron back scatter diffraction) and transmission el. microscopy (TEM). Tension creep tests were performed on the as-pressed samples at temperature of 773 K and under applied load 60 MPa. For comparison purposes the same creep test was performed also on the unpressed state. The effect of number ECAP passes on creep behavior of pure Fe was investigated. Results showed that the creep resistance of pure Fe after ECAP is improved in comparison with the unpressed state.
Úplný záznam
Structure and properties of ultrafine-grained aluminium alloys prepared by severe plastic deformation (ECAP)
 Dám, Karel ; Jäger, Aleš ; Lejček, Pavel
The aim of this work is to find the dependence between Equal-Channel Angular Pressing (ECAP) processing conditions and final microstructure of aluminium alloys based on Al-Mg-Sc.
Úplný záznam
Effect of different number of ECAP passes on creep in Cu-Zr alloy
 Král, Petr ; Dvořák, Jiří ; Svoboda, Milan ; Kvapilová, Marie ; Sklenička, Václav
A coarse-grained binary Cu-0.2wt%Zr alloy was processed by equal-channel angular pressing (ECAP) in order to evaluate the effect of severe plastic deformation on the thermal stability of resulting ultrafine-grained microstructure after ECAP and on creep behaviour of the pressed alloy. Constant stress creep tests in tension were conducted at temperature 673 K and at the different applied stresses. It was found that the Cu-0.2Zr alloy after the first four ECAP passes exhibited higher creep resistance by comparison with unpressed state. However, the alloy processed by 8 ECAP passes showed faster creep rate than unpressed material under the same loading conditions. The measured value of stress exponent of the creep rate n~6 indicates possibility of an intragranular deformation mechanism as the rate-controlling process in creep of an alloy after 8 ECAP passes. Furthermore, creep behaviour of ECAPed material may be influenced by mesoscopic boundary sliding along shear bands.
Úplný záznam

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