Nanocrystallization of amorphous Al88Y7Fe5 alloy induced by plastic deformation

Deformation induced primary crystallization in a thermally non-primary crystallizing amorphous Al85Ce8Ni5Co2 alloy

“…Generally, large deformation induces precipitation of nanocrystals in amorphous alloys [13][14][15]24]. Recently, the thermal or athermal nature of the deformation induced precipitation process has been the subject of widespread discussion [24,25].…”

“…Recently, severe plastic deformation induced nanocrystallization, e.g., by cold rolling [13,14] and high pressure torsion (HPT) [15,16] has received increased attention. During HPT processing, a porosity and impurity-free disc-shaped sample is strained by torsion under high pressure [17,18].…”

“…During HPT processing, a porosity and impurity-free disc-shaped sample is strained by torsion under high pressure [17,18]. It has been found that these methods can induce defect-free Al-nanocrystal development and growth in amorphous Al 88 Y 7 Fe 5 alloy mainly in the shear bands with an extremely high density and homogeneous distribution [13,15].…”

High-Pressure Torsion of Machining Chips and Bulk Discs of Amorphous Zr<SUB>50</SUB>Cu<SUB>30</SUB>Al<SUB>10</SUB>Ni<SUB>10</SUB>

“…[3][4][5][6][7][8][9][10][11][12][13][14][15] The application includes the consolidation of metallic powders, [3][4][5] composites, [6][7][8][9][10][11][12] ball-milled powders, 13,14) amorphous powders, 15) amorphous ribbons, 16) and very recently machining chips. 17,18) Strain-induced amorphization was reported for some compounds, 19,20) whereas crystallization is detected in amorphous materials such as Cu 50 [21][22][23][24][25][26][27][28][29][30][31] It is well established that bulk amorphous materials have high strengths and high hardness [32][33][34][35] and it is known that processing through HPT leads to an increase in the strength of metallic materials. 1,<...>…”

“…17,18) Strain-induced amorphization was reported for some compounds, 19,20) whereas crystallization is detected in amorphous materials such as Cu 50 [21][22][23][24][25][26][27][28][29][30][31] It is well established that bulk amorphous materials have high strengths and high hardness [32][33][34][35] and it is known that processing through HPT leads to an increase in the strength of metallic materials. 1,2) In spite of many publications regarding the HPT processing of amorphous materials, [21][22][23][24][25][26][27][28][29][30][31] little attention has been paid to the strength of amorphous materials after processing by HPT.…”