Evolution of the structure formation during dynamic pressing of the AMts alloy

Structural and phase transformations in aluminum-copper alloys under the effect of electroplastic deformation

“…The process parameters have been determined at which the EPDR method can be used to refine the structure of the Al-Cu alloys via recrystallization without the heat treatment stage (the degree of deformation е > 2.2 and the current density j = 320 A/mm 2 ). The above mentioned regularities of structure for mation that reflect the competition between the pro cesses of aging and recrystallization in the Al-Cu alloys agree well with the available literature data and are explained in the context of the current views on phase and structural transformations that occur in alu minum alloys under external effects [9,[12][13][14].…”

“…6b). Similar structures are observed in the case of the high rate deformation of aluminum alloys, e.g., dynamic channel angular pressing [12]. These structures result from the formation of zones of localized deformation, which appear due to high gradients of shear stresses and temperatures.…”

Phase and structural transformations in the aluminum amts alloy upon severe plastic deformation using various techniques

“…As was established earlier [10], in the AMts alloy there is formed an ultrafine grained (UFG) mixed structure upon the deformation with V = 150 m/s (N = 1). This structure consists of crystallites with a high density of lattice dislocations and "diffuse" non equilibrium high angle boundaries, and of a small amount of initial fragmented subgrains separated by low angle boundaries.…”

“…The technique of the dynamic channel angular pressing, which uses the scheme close to the ECAP but produces strain rates three to five orders of magnitude greater (at the expense of the energy of pulsed sources) than in ECAP, is described in detail in [8][9][10]. In this experiment, the piston scheme of deformation is applied, in which a sample is forced through the chan nels by permanently pressing the piston with propel lant powder gases.…”

Deformation of high density polyethylene by dynamic equal-channel-angular pressing

“…34,35 Previous studies veried the high efficiency of the technique, since one or two D-ECAP passes can achieve the same degree of structure renement as 6-8 ECAP passes. 34,36,37 It is also possible to use D-ECAP to deform samples with cross sections larger than those in conventional pressing equipment. 34,37 In addition, D-ECAP involves shock waves which may induce structural modications.…”