Microstructure, mechanical properties and deformation mechanisms of an as-cast Mg-Zn-Y-Nd-Zr alloy for stent applications

doi:10.1016/j.jmst.2019.01.007

Abstract

Abstract:

A new Mg-2Zn-0.2Y-0.5Nd-0.4 Zr (wt%) alloy designed specially for stent applications has been developed. The as-cast alloy is featured with equiaxed grains with a mean size of about 40 μm and a small amount of second phase (T phase) distributed discontinuously either at the grain boundaries or inside the grains. This alloy exhibits a tensile elongation of up to 35%, which is much larger than that of most reported other as-cast Mg alloys. The tensile deformation mechanisms have also been investigated. The results show that, besides basal slip, {10 - 12} extension twining and non-basal pyramidal slips can also be observed at initial stage and later stage during tensile deformation, respectively, which are responsible for the good room-temperature ductility.

Key words: Magnesium alloys, Vascular stents, Microstructure, Mechanical properties, Deformation mechanisms

Jianfeng Wang, Hongbo Zhou, Liguo Wang, Shijie Zhu, Shaokang Guan. Microstructure, mechanical properties and deformation mechanisms of an as-cast Mg-Zn-Y-Nd-Zr alloy for stent applications[J]. J. Mater. Sci. Technol., 2019, 35(7): 1211-1217.

Figures/Tables 10

Fig. 1. (a) Optical micrograph of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy and (b) corresponding grains size distribution histogram.

Fig. 2. DSC curve of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy.

Fig. 3. (a) TEM bright field image of the second phase at grain boundary for the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy; (b) EDS result of region A in (a); (c), (d), and (e) SAED patterns of regions B, C, and D in (a), taken from the [17 4 23], [423], and [861] zone axes, respectively.

Fig. 4. Tensile engineering stress?strain curves of three specimens for the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy, the inset is SEM fractograph after tensile test.

Table 1 Mechanical properties of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy and several typical as-cast Mg alloys reported previously. YS and UTS are yield strength and ultimate tensile strength, respectively.

Alloys	YS (MPa)	UTS (MPa)	Fracture elongation (%)	Ref.
Mg-2Zn-0.2Y-0.5Nd-0.4 Zr	89 ± 6	203 ± 5	35 ± 3	This work
Mg-2.0Zn	27 ± 2	145.9 ± 3	12.23 ± 1.5	[36]
Mg-4.0Zn	58 ± 1.5	216.8 ± 10	15.8 ± 5.5	[36]
Mg-4.0Zn-0.2Ca	58.1 ± 1	225 ± 5	17.5 ± 1	[36]
Mg-4.0Zn-2Ca	90 ± 4	143 ± 5	2.1 ± 0.2	[36]
Mg-1.0Zn-1Mn	44	174	?$\widetilde{1}$2	[37]
Mg-2.0Zn-1Mn	?$\widetilde{6}$0	?$\widetilde{1}$80	$\widetilde{1}$1	[37]
Mg-2Zn-0.46Y-0.5Nd	105	209	10.6	[23]
Mg-2.5Zn-0.3Ca-0.4La	77	164	7	[38]
Mg-4.5Zn-1Y-3Nd-0.5 Zr	-	219.2	11	[39]
Mg-3Zn-0.9Y-0.6Nd-0.6 Zr	119	180	12.3	[40]
Mg-6.0Gd-1Zn	144 ± 1.4	144 ± 1.4	8 ± 1.2	[41,42]
Mg-6.0Al-1Zn (AZ61)	121 ± 2.4	218 ± 8.1	10 ± 1.2	[42]
Mg-3.0Gd-3.0Al-1Zn	121 ± 2.4	218 ± 8.1	10 ± 1.2	[42]
Mg-5.0Zn-0.6 Zr	88	236	18	[32]
Mg-5.0Zn-2Nd-0.6 Zr	102	134	3	[32]
Mg-5.0Zn-2Nd-1Y-0.6 Zr	-	220	12	[32]
Mg-3Nd-0.2Zn-0.5 Zr	92	?$\widetilde{2}$25	9.5	[43]

Fig. 5. TEM bright field images of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy after a plastic strain of 5% showing (a) dislocations and (b) twins; (c) TEM dark field image of the squared region in (b).

Fig. 6. (a) EBSD Euler map and (b) misorientation distribution of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy after a plastic strain of 5%.

Fig. 7. (a) TEM bright field image and (b) corresponding dark field image of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy after a plastic strain of 35%.

Fig. 8. (a) EBSD Euler map and (b) misorientation distribution of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy after a plastic strain of 35%.

Fig. 9. (a) HRTEM image of the as-cast Mg-2Zn-0.2Y-0.5Nd-0.4 Zr alloy after a plastic strain of 35% viewed along the [1 - 21 - 3]Mg zone axis; (b) corresponding fast Fourier transform pattern; (c) and (d) inverse fast Fourier transform lattice images of the reflections of (0 - 1 11) and (1 - 1 01) crystal faces, respectively.

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