The effect of temperature of magnetic pulsed compaction on the characteristics of nanostructured aluminum compacts

Abstract

Magnetic pulse compaction (MPC) allows one to maintain a nanostructured state in nano powder metallic compacts and to achieve near theoretical density. In this study, nano Al powders of about 80 nm in diameter were prepared with the Pulse Wire Evaporation (PWE) method and passivated with a thin Al 2 O 3 layer on a surface about 2 nm thick to prevent further agglomeration and oxidation. The powders were compacted with the dynamic compaction of magnetic pulsed force. The effects of the compaction temperature and passivated oxide layer of Al powders on mechanical properties were investigated. The prepared compacts were considered as the composite materials of the metal-matrix containing oxides of their own metal. A fine and uniform bulk structure was kept up to 400 o C, which showed neither further agglomeration nor grain growth during compaction and heat treatment due to the formation of Al/Al 2 O 3 composites.

Microstructure and mechanical properties of rapidly solidified Mg alloy powders compacted by magnetic pulsed compaction (MPC) method

“…Thus, much faster time and lower energy PM processing like magnetic pulsed compaction (MPC) would be necessary for the Mg alloy powder consolidation. The MPC pressurizes the powders dynamically using a magnetic pulse with the pressures more than 2 GPa, resulting in the high speed movement of particles over 10-100 m/s and very short duration of an order of microsecond (s) [5,6], resulting in forming a segregation free and a fine grain structure. Its easy energy controllability and high energy efficiency becomes a further opportunity of application.…”

Dynamic deformation and fracture behavior of ultrafine-grained aluminum alloy fabricates by equal-channel angular pressing

“…[1][2][3][4][5][6][7][8][9][10][11] Thermomechanical processing, [12] mechanical alloying, [13] rapid solidification, [14] and crystallization of amorphous alloys [15] are the main methods to achieve grain refinement. [1][2][3][4][5][6][7][8][9][10][11] Thermomechanical processing, [12] mechanical alloying, [13] rapid solidification, [14] and crystallization of amorphous alloys [15] are the main methods to achieve grain refinement.…”

Prediction of the Forming Limit of Porous Metals Using the Finite Element Method

“…1) Powder forming involves fabrication of a preform by conventional pressand-sinter processing, followed by various forming processes, 2) for example pulse electrical sintering, 3) dynamic compaction, 4,5) hot pressing, 6) powder forging, powder extrusion, powder rolling etc., in which the powder or porous preform is brought into a final shape through substantial densification.…”