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>

Abstract

Machining chips and bulk discs of an amorphous Zr 50 Cu 30 Al 10 Ni 10 alloy were processed by high-pressure torsion (HPT). It was confirmed that the machining chips can be consolidated using HPT at room temperature to disc-shaped samples with 10 mm diameter and 0.6 mm thickness having a relative density of 96.7%. The hardness for the consolidated chips was well comparable to those obtained using the bulk samples when the imposed strain is large. No crystallization was detected after HPT processing of chips and bulk samples.

Fabrication of nanocomposites through diffusion bonding under high-pressure torsion

“…In practice, a bulk metal in a disk shape is severely strained under extreme pressure with concurrent torsional straining and the processing is often conducted for hard-to-deform metals including bulk intermetallic compounds [8][9][10][11] at room temperature (RT). Because of 2 the intensive introduction of point and line defects during the significant grain refinement process, HPT has been applied also for the bonding of machining chips [12,13] and the consolidation of metallic powders [14][15][16][17][18][19]. Nevertheless, these processes generally require high processing temperatures and/or two-step processes for cold/hot compaction prior to consolidation by HPT.…”

Ultrafine-Grained Materials Fabrication with High Pressure Torsion and Simulation of Plastic Deformation Inhomogeneous Characteristics

“…There also have some research reported that effects on the thermal properties of BMGs happened. For example, Edalati et al reported that the glass transition temperature of Zr 50 Cu 30 Ni 10 Al 10 BMG increased few after a HPT process [60]. However, Meng et al reported that HPT did not change the glass transition temperature [61].…”

Development of a magnesium-alumina composite through cold consolidation of machining chips by high-pressure torsion

“…Thus, a Co-NiO composite was produced by 5 turns of HPT at 6 GPa [7], an Alfullerene composite was produced by 15 turns at 2.5 GPa [8] and an Al-Al 2 O 3 nanocomposite was fabricated by using 10 turns at 6 GPa [9]. There are also reports of the use of HPT for the consolidation of machining chips: for example, copper machining chips were consolidated by 5 turns of HPT at a pressure of 6 GPa at room temperature [10], Al-8% Si-3% Cu chips were consolidated by 10 turns at a pressure of 8 GPa [11] and Zr 50 Cu 30 Al 10 Ni 10 metallic glass chips were consolidated by 10 turns at a pressure of 6 GPa [12].…”