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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Mechanical and creep properties of aluminium alloys processed by Equal-Channel Angular Pressing (ECAP)
 Dvořák, Jiří ; Král, Petr ; Kvapilová, Marie ; Sklenička, Václav ; Svoboda, Milan
This work examines mechanical and creep behavior in UFG aluminium alloys. UFG microstructure was achieved after application 8 ECAP passes. The coarse-grained materials were subjected to ECAP at room temperature in a die, which had a 90° angle between the channels. The microstructural investigations were performed using TEM and EBSD. The experiments show that ECAP reduced the average grain size to approximately 300 nm and led to the higher occurrence of high-angle boundaries in comparison with the coarse-grained material. The mechanical properties of these alloys were investigated using hardness measurements and tensile testing at room temperature. In addition, constant stress creep tests in compression were conducted at the applied stresses from 10 to 80 MPa and at temperature of 473 K. The aim of this investigation was to determine the effect of ECAP on the mechanical behavior and creep resistance of aluminium alloys containing Mg and/or Sc.
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Creep failure of Al-0.2%Sc alloy after severe plastic deformation (ECAP)
 Král, Petr ; Dvořák, Jiří ; Kvapilová, Marie ; Svoboda, Milan ; Sklenička, Václav
Experiments were conducted on a coarse grain Al-0.2%Sc alloy which was processed using ECAP method (equal-channel angular pressing). ECAP deformation was conducted at room temperature using a die with two channels inclined an angle 90°. Tensile creep tests were performed at 473 K and 20 MPa. The microstructure and the fracture surfaces were observed by light microscopy, SEM and using EBSD technique. Creep fracture elongation of Al-0.2%Sc alloy was increasing with the number of ECAP passes. The fracture behaviour of samples after ECAP deformation and subsequent creep exposure was controlled by the formation of the mesoscopic slip bands on the specimen surface. The analyzes of microstructures of samples after 2 and 4 ECAP passes showed that the failure probably occurred at the places with the maximum heterogeneity of the microstructure.
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