Gradient microstructure and enhanced mechanical performance of magnesium alloy by severe impact loading

doi:10.1016/j.jmst.2019.06.013

Abstract

Abstract:

Subjecting a workpiece to a surface treatment with severe impact loading is a novel severe plastic deformation procedure to fabricate gradient microstructures through the thickness and longitudinal direction. Mechanical performance is a function of twin density and the newly-formed grain size gradients. {10$\bar{1}$2} tensile twins created from processing without excessive grain refinement lead to strength enhancement with retained ductility. Creation of residual strain by a single impact results in a significant reduction in time and cost of the process. This paper investigates the effect of applying severe impact loading on mechanical and microstructural properties of magnesium for various impact velocities.

Key words: Surface modification, Twinning, Magnesium alloys, Mechanical properties, Severe impact loading (SIL)

Maryam Jamalian, David P.Field. Gradient microstructure and enhanced mechanical performance of magnesium alloy by severe impact loading[J]. J. Mater. Sci. Technol., 2020, 36: 45-49.

Figures/Tables 7

Fig. 1. Schematic of the SIL process: (a) second impact in distance of 2 mm; (b) procedure is repeated for another side of the sample (rotated 180° w.r.t. RD).

Fig. 2. Morphologies of affected area: (a) polished surface before SIL; (b) one impact, IV = 1 m/s; (c) one impact, IV = 1.5 m/s; (d) after SIL procedure, both sides of the sample treated with IV = 1.5 m/s and step distance is 2 mm.

Fig. 3. Optical images through thickness: (a) as-received; (b) after SIL procedure. Both sides of the sample treated with IV = 1.5 m/s; (c) after SIL procedure. Both sides of the sample treated with IV = 3 m/s. Orientation map and boundaries after SIL procedure with IV = 3 m/s; (d) from the center of the gradient structure; (e) near the edge of the sample.

Fig. 4. Tensile behavior of AZ31 after SIL procedure.

Table 1 Vickers hardness at center and edge (IV: impact velocity).

Position	As-received	IV = 1.5 m/s	IV = 3 m/s
Center	48.1±1.42	63.8±2.72	82.1±5.33
Edge	62.3±1.77	79.5±3.85	98.9±1.46

Fig. 5. Fracture surfaces of treated sample with IV = 1.5 m/s: (a) normal plane; (b) transverse plane; (c) rolling plane.

Fig. 6. (a) Schematic of gradient microstructure before SIL process and the corresponding (b) boundaries map, (c) image quality map and (d) KAM map; (e) boundaries map, (f) image quality map and (g) KAM map after SIL treatment both sides with IV = 1.5 m/s.

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