Rapid synthesis of an extra hard metal matrix nanocomposite at ambient temperature

Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion

“…As demonstrated earlier in a diffusion-bonded Al-Mg system processed by HPT using separate Al and Mg disks [73], the observed high hardness in the Al-3% Mg alloy is a consequence of strengthening by grain refinement together with solid solution strengthening and precipitation hardening [74]. The value of the hardness increase by solid solution hardening may be expressed in the form…”

Micro-mechanical and tribological properties of aluminum-magnesium nanocomposites processed by high-pressure torsion

“…As described earlier [14], this study involved a unique procedure of sample set-up whereby three separate disks, in the order of Al, Mg and Al, were piled in the depression on the lower anvil of the HPT facility without any glue or the application of any metal blushing treatment to the disk surfaces. The HPT processing was performed to produce four disks of the Al-Mg system using a compressive pressure of 6.0 GPa for a total revolution of 20 turns at a constant rotation speed of 1 rpm.…”

“…However, this study described only the computational calculation of the distribution of equivalent stress in the processed disk using a finite element method and there was no detailed microstructural analysis of the processed disk. Recently, the bonding of separate Al and Mg disks was processed through HPT by stacking a set of two disks for up to 20 turns [13] and stacking three disks for 5-10 turns [14][15][16] for producing bi-layered and multi-layered structures, respectively, in an Al-Mg system through HPT at RT. In particular, the earlier studies focused on determining the strengthening mechanisms [14], the fast diffusivity of Mg in Al matrix [15] and the plastic instability [16] of the Al-Mg system from the bonding of three disks.…”

“…Recently, the bonding of separate Al and Mg disks was processed through HPT by stacking a set of two disks for up to 20 turns [13] and stacking three disks for 5-10 turns [14][15][16] for producing bi-layered and multi-layered structures, respectively, in an Al-Mg system through HPT at RT. In particular, the earlier studies focused on determining the strengthening mechanisms [14], the fast diffusivity of Mg in Al matrix [15] and the plastic instability [16] of the Al-Mg system from the bonding of three disks. It is important to note that there has been no report on the tribological properties of this newly synthesized metal system fabricated from solid metals through the application of HPT.…”

Intermetallics formed at interface of ultrafine grained Al/Mg bi-layered disks processed by high pressure torsion at room temperature

“…the AJ62/AlSi17Cu4Mg engine block fabricated by die casting [1]. Mg/Al composites have been fabricated by friction stir welding [2], twin roll casting [3], roll cladding [4], co-extrusion [5], accumulative roll bonding (ARB) [6] and high pressure torsion (HPT) [7,8]. Amongst the Mg/Al composites fabricated through these techniques, a substantial variation in bonding quality and intermetallics formed at the interface is found.…”