Effects of microstructure on the torsional properties of biodegradable WE43 Mg alloy

doi:10.1016/j.jmst.2020.04.003

Abstract

Abstract:

Torsional properties are important performance parameters for bone screw applications, but they are seldom studied, especially for newly developed biodegradable Mg alloys. In this study, WE43 Mg alloy with different microstructures was achieved by equal channel angular pressing (ECAP) and heat treatment, and their torsional properties were studied. In addition, tensile properties were also tested as a comparison. The results indicated that grain refinement led to higher torsional strength and ductility, while the second phases improved the torsional strength but reduced the ductility. The texture was strengthened after ECAP, as a result the tensile strength increased, but the torsional strength did not increase and even decreased, especially for 2-pass ECAP sample with a typical basal fiber texture. The basal plane orientation deviation from the extrusion direction after 4-pass ECAP resulted in higher torsional strength and lower torsional ductility, but lower tensile strength and higher tensile ductility were obtained. This implied that a strong fiber texture would reduce the torsional strength but improve the torsional ductility, which was different from its effect on tensile properties.

Key words: Torsional properties, Texture, ECAP, WE43 Mg alloy

Yi Zhang, Lili Tan, Qingchuan Wang, Ming Gao, Iniobong P. Etim, Ke Yang. Effects of microstructure on the torsional properties of biodegradable WE43 Mg alloy[J]. J. Mater. Sci. Technol., 2020, 51: 102-110.

Figures/Tables 12

Fig. 1. Optical Microstructures of WE43: (a) as-extruded; (b) T4 treated; (c) T5 treated; (d) T6 treated; (e) 1p; (f) 2p; (g) 4p.

Fig. 2. Average grain size of WE43 in different conditions.

Fig. 3. Distribution of second phases: (a) as-extruded; (b) T4 treated; (c) T5 treated; (d) T6 treated; (e) 1p; (f) 2p; (g) 4p.

Fig. 4. (a) EDS analysis for the second phases and (b) XRD patterns of WE43 in different conditions.

Fig. 5. (0002) pole figures of as-extruded and heat-treated WE43: (a) as-extruded; (b) T4 treated; (c) T5 treated; (d) T6 treated.

Fig. 6. (0002) pole figures of ECAP processed WE43: (a) 1p; (b) 2p; (c) 4p.

Fig. 7. Shear stress-strain curves of WE43: (a) heat-treated; (b) ECAP processed.

Fig. 8. Tensile stress-strain curves of WE43: (a) heat-treated; (b) ECAP processed.

Table 1 Torsional and tensile properties of WE43.

Samples	τ_0.3 (MPa)	τ_m (MPa)	γ_max (%)	σ_0.2 (MPa)	σ_m (MPa)	ε_max (%)
E	117.0 ± 0.8	191.0 ± 1.4	44.1 ± 2.8	187.0 ± 2.0	250.0 ± 5.0	19.8 ± 1.1
T4	72.0 ± 1.6	141.3 ± 0.5	41.7 ± 2.0	135.0 ± 4.0	212.5 ± 7.5	20.9 ± 0.1
T5	131.3 ± 0.9	218.0 ± 7.8	39.6 ± 2.3	235.0 ± 1.5	312.5 ± 7.5	14.8 ± 0.1
T6	103.7 ± 3.4	169.0 ± 0.8	29.0 ± 0.4	170.5 ± 3.5	235.0 ± 0.5	17.1 ± 1.1
1p	107.0 ± 3.0	193.0 ± 1.0	39.5 ± 2.8	195.0 ± 4.0	265.0 ± 1.5	21.7 ± 0.6
2p	103.5 ± 1.5	176.7 ± 2.5	43.5 ± 3.1	222.5 ± 7.5	285.0 ± 5.0	21.2 ± 0.7
4p	111.5 ± 0.5	189.3 ± 3.1	32.4 ± 2.5	185.0 ± 6.0	260.0 ± 0.5	26.8 ± 1.2

Fig. 9. Torsional fractures of WE43: (a) as-extruded; (b) T4 treated; (c) T5 treated; (d) T6 treated; (e) 1p; (f) 2p; (g) 4p.

Fig. 10. Tensile fractures of WE43: (a) as-extruded; (b) T4 treated; (c) T5 treated; (d) T6 treated; (e) 1p; (f) 2p; (g) 4p.

Fig. 11. Sketchs of the slip planes and applied stress for (a) tensile test and (b) torsional test.

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