Microstructure and Mechanical Property of Mg-13Gd-0.2Ni Alloy Processed by Extrusion and Aging

doi:10.1007/s40195-024-01712-1

Abstract

Abstract:

In this work, a good combination of strength and ductility is achieved in a Mg-13Gd-0.2Ni alloy by conventional extrusion and following aging treatment. The aged Mg-13Gd-0.2Ni alloy exhibits a yield strength (YS) of 363 MPa, an ultimate tensile strength (UTS) of 433 MPa, and an elongation of 11.9%. The aged Mg-13Gd-0.2Ni alloy contains a microstructure with a 95% proportion of dynamically recrystallized (DRXed) grains with a micron size, weak texture, and a high number density of prismatic β′ precipitates within grains. The bulk compounds enriched with Ni element which are mainly formed during casting and stable in the extruded and aged samples. Few dynamic compounds are formed during extrusion, and a high density of prismatic β′ precipitates are formed during aging. The high density of prismatic β′ precipitates results in a significant increase in the strength of the Mg-13Gd-0.2Ni alloy, and the YS and UTS are increased by 153 and 136 MPa, respectively. The high proportion of DRXed grains with a weak texture contributes mainly to the high ductility and the fine compounds with a low density at grain boundaries formed during aging have no significant adverse effect on ductility of the aged Mg-13Gd-0.2Ni alloy. These findings for the novel Mg-Gd-Ni alloy can provide guidance for the design of wrought Mg alloys with superior mechanical properties.

Key words: Mg-Gd-Ni alloy, Extrusion, Aging, Strength, Ductility

Hang Zhang, Jiaying Zhao, Rongguang Li, Boshu Liu, Shanshan Li, Sha Sha, Yuehong Zhang, Man Xu, Yan Tang. Microstructure and Mechanical Property of Mg-13Gd-0.2Ni Alloy Processed by Extrusion and Aging[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(8): 1367-1376.

Figures/Tables 10

Fig. 1 Tensile engineering stress-strain curves for the E and E + A samples

Table 1 Yield strength, ultimate tensile strength, elongation of the extruded, and aged Mg-13Gd-0.2Ni alloys in the present work and the Mg-Gd-based alloys in literature [15,17,36,37,38,39,40,41,42,43]

Samples	YS (MPa)	UTS (MPa)	Elongation (%)	References
E	210	297	23.1	This work
E + A	363	433	11.9	This work
Mg-15Gd-1Zn-0.4Zr	465	524	4.0	[15]
Mg-15Gd	504	518	4.5	[17]
Mg-10Gd-3Y-0.5Zr	247	360	2.7	[36]
Mg-9.2Gd-3.3Y-1.2Zn-0.9Mn	345	418	6.8	[37]
Mg-12.6Gd-1.3Y-0.9Zn-0.5Mn	543	564	1.2	[38]
Mg-8Gd-3Y-0.5Ag-0.5Zr	312	412	4.3	[39]
Mg-13Gd-4Y-2Zn-0.5Zr	383	446	6.5	[40]
Mg-12Gd-4Dy-2Zn-0.5Zr	242	342	3.0	[41]
Mg-11Gd-3Y-0.5Nd-1Zr	365	459	5.9	[42]
Mg-10Gd-5Y	235	324	7.0	[43]

Fig. 3 XRD patterns of the Mg-13Gd-0.2Ni samples

Fig. 4 SEM images for the a E and b E + A samples. The horizontal direction is parallel to ED

Fig. 5 TEM images of the E sample: a bulk precipitates, b grain boundaries

Fig. 6 TEM image a and the elemental maps of Mg b, Gd c, Ni d in the E + A sample

Fig. 7 TEM images of the E + A sample a, and EDS analysis of the compounds b

Fig. 8 TEM images of the grains and the fine compounds in the E + A sample: a DRXed grains, b grain boundary with precipitates, and c and d TEM images for the nano-sized compounds within grain with an electron beam approximately parallel to [0002]Mg c and [1-100]Mg d, respectively

Fig. 9 EBSD analysis for the E + A sample: a inverse pole figure (IPF) map, b KAM map, c and f SF distribution map for basal slip, d (0002), (11-20), and (10-10) pole figures, and e distribution of misorientation angle

Fig. 2 Optical microstructure of the E sample, a, b longitudinal section, c, d cross section. The horizontal direction is parallel to ED

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