Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Forging

doi:10.1007/s40195-020-01137-6

Abstract

Abstract:

In this study, the mechanical properties and damping capacities of cast Mg-5.5Zn-0.6Zr (weight percent, ZK60) alloys have been simultaneously improved by a facile multi-directional forging (MDF) processing, and the mechanisms of microstructure evolution and texture modification are systematically investigated. The activation of tension twinning occurs during the initial MDF stage, due to the coarse-grained structure of the as-cast alloy. With increasing MDF passes, the continuous dynamic recrystallization (CDRX) results in a fine equiaxed-grain structure. The typical non-basal texture is formed in the as-MDFed alloy for 6 passes, with the (0001) planes inclined 60°-70° to forged direction and 10°-20° to transverse direction, respectively. A good balance between the strength (~ 194.9 MPa) and ductility (~ 24.9%) has been achieved, which can be ascribed to the grain refinement, non-basal texture and fine precipitate particles. The damping capacity is remarkably improved after MDF processing, because the severe deformation increases the dislocation density, which effectively enlarges the sweep areas of mobile dislocations.

Key words: Mg alloy, Multi-directional forging, Microstructure, Texture evolution, Mechanical properties, Damping capacity

L. B. Tong, J. H. Chu, D. N. Zou, Q. Sun, S. Kamado, H. G. Brokmeier, M. Y. Zheng. Simultaneously Enhanced Mechanical Properties and Damping Capacities of ZK60 Mg Alloys Processed by Multi-Directional Forging[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(2): 265-277.

Figures/Tables 13

Fig. 1 OM microstructures of the a as-cast b as-homogenized alloys, c sketch map of MDF process

Fig. 2 OM micrographs of the as-MDFed alloys for a 1 pass, b 3 passes c 6 passes

Fig. 3 TEM micrographs of the as-MDFed alloy for 6 passes: a grain morphologies, b enlargement of fine precipitate particles c SAED of blue dash line region

Fig. 4 OIM micrographs of the as-MDFed alloys for a 1 pass, b 2 passes, c 3 passes d 6 passes, and the reference direction is FD

Fig. 5 Misorientation angle distribution of the as-MDFed alloys for a 1 pass, b 2 passes, c 3 passes d 6 passes

Fig. 6 Micro-texture analysis of the as-MDFed alloys for a 1 pass, b 2 passes, c 3 passes d 6 passes

Fig. 7 Pole figures of the a as-homogenized and as-MDFed alloys after b 1 pass, c 3 passes d 6 passes

Fig. 8 Room-temperature mechanical properties of the as-MDFed alloys after different passes: a tensile curves b calculated data

Table 1 Tensile property of ZK60 alloys after MDF processing for different passes

ZK60 alloys	UTS (MPa)	TYS (MPa)	EF (%)
As-homogenized	192.4 ± 3.5	78.1 ± 2.1	5.5 ± 0.4
MDF-1P	287.9 ± 4.2	166.6 ± 1.9	12.4 ± 1.0
MDF-2P	293.7 ± 3.4	202.5 ± 4.2	16.2 ± 0.7
MDF-3P	306.6 ± 5.6	220.5 ± 2.8	17.3 ± 1.1
MDF-6P	292.8 ± 2.9	194.9 ± 3.1	24.9 ± 1.3

Fig. 9 Damping behaviors of the as-MDFed alloys: a strain amplitude versus damping curves, b G-L plots, c temperature-dependent damping capacity

Fig. 10 Schmid factor distribution of the as-MDFed alloy for a 1 pass, b 2 passes, c 3 passes d 6 passes

Fig. 11 Fracture morphologies of the as-MDFed alloys for a 1 pass, b 2 passes, c 3 passes d 6 passes

Fig. 12 Schematic diagrams of the a strengthening b damping mechanisms for the ZK60 alloys before and after MDF process

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