Integrated Extrusion-Shear Forming Process of the Solid-State Recycled AZ80 Magnesium Alloy via Hot Press Sintering

doi:10.1007/s40195-019-00987-z

Abstract

Abstract:

The consolidation recycled AZ80 billets were successfully fabricated through the cold press and hot press sintering of the AZ80 metal chips. The consolidation recycled billets sintered at 350 °C present the comparable compressive properties and inferior tensile properties compared with the initial cast billets. The defects in the consolidation recycled billet were inclined to propagate along the bond interface between the metal chips during tension, which resulted in the inferior tensile properties of the recycled billets. The recycled billets were then subjected to the integrated extrusion-shear (ES) process. The homogeneous finer dynamic recrystallization grains with an average grain size of 6 μm can be obtained in the shear deformation zone and extrusion sizing zone through integrated ES process at 300 °C with an extrusion velocity of 0.6 mm/s. The recycled billets after integrated ES forming process present rival tensile properties compared with the initial cast billets after integrated ES forming with the same extrusion parameters, which can be ascribed to that the integrated ES forming can nearly eliminate the defects through the severe compressive and shear strain. The solid-state recycling process through hot press sintering and subsequent integrated ES process can fabricate the consolidation recycled AZ80 rod, which demonstrates the comparable tensile properties with the cast-extrusion rod.

Key words: Solid-state recycling, Hot press sintering, Integrated extrusion-shear forming, Metal chips, Mechanical properties

Bing Li, Bugang Teng, Baoting Zhang. Integrated Extrusion-Shear Forming Process of the Solid-State Recycled AZ80 Magnesium Alloy via Hot Press Sintering[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(3): 351-361.

Figures/Tables 10

Fig. 1 Images of a the schematic diagram, b the experimental apparatus, c the mold for integrated ES process

Fig. 2 Images of the a cold-pressed billets, b hot press sintering billets, c the integrated ES-formed rod with different temperatures, d the integrated ES-formed rod with extrusion temperature of 400 °C and 450 °C, e the integrated ES-formed rod with different extrusion velocities, f the integrated ES-formed extrusion rod with extrusion velocities of 0.6 mm/s and 1.0 mm/s, g the schematic diagram of the billets after integrated ES forming

Fig. 3 OM and SEM images of the consolidation recycled billets at different sintering temperatures: a, b 250 °C, c, d 300 °C, e, f 350 °C, g, h 400 °C

Fig. 4 Stress-strain response of a compression curves the recycled billets at different temperatures, b tensile curves of cast and recycled billets sintered at 350 °C

Fig. 5 Tensile fracture morphologies of the a, c cast billets, b, d recycled billets

Fig. 6 Optical microscopes of the different zones of the recycled-extrusion billets at different temperatures: a CRZ/300 °C, b ESZ/300 °C, c SDZ/300 °C, d CRZ/350 °C, e ESZ/350 °C, f SDZ/350 °C, g CRZ/400 °C, h ESZ/400 °C, i SDZ/400 °C, j CRZ/450 °C, k ESZ/450 °C, l SDZ/450 °C

Fig. 7 SEM images of the ESZ and SDZ of the recycled-extrusion billets at different temperatures: a ESZ/300 °C, b ESZ/350 °C, c ESZ/400 °C, d ESZ/450 °C, e SDZ/300 °C, f SDZ/350 °C, g SDZ/400 °C, h SDZ/450 °C

Fig. 8 Optical microscopes of the different zones of recycled-extrusion billets at different extrusion velocities: a CRZ/0.2 mm/s, b ESZ/0.2 mm/s, c SDZ/0.2 mm/s, d CRZ/0.6 mm/s, e ESZ/0.6 mm/s, f SDZ/0.6 mm/s, g CRZ/1.0 mm/s, h ESZ/1.0 mm/s, i SDZ/1.0 mm/s, j CRZ/1.4 mm/s, k ESZ/1.4 mm/s, l SDZ/1.4 mm/s

Fig. 9 Tensile stress-strain curves of a the recycled billets after integrated ES forming at different extrusion temperatures, b at different extrusion velocities, c the cast-extrusion and recycled-extrusion billets

Fig. 10 Fracture morphologies of a, c the recycled-extrusion billets, b, d cast-extrusion billets

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