Effects of Sb Addition on Microstructural Evolution and Mechanical Properties of Mg-9Al-5Sn Alloy

doi:10.1007/s40195-020-01054-8

Abstract

Abstract:

The Mg-9Al-5Sn-xSb (x = 0.0, 0.3, 0.6, 1.0, 1.5 wt%) alloys were prepared by a simple alloying process followed by hot extrusion with an extrusion ratio of 28.2. The effects of Sb additions on the microstructure and mechanical properties of the Mg-9Al-5Sn alloys were investigated by optical microscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy equipped with an energy-dispersive X-ray spectrometer. The results indicated that the phases α-Mg matrix, Mg₂Sn, Mg₃Sb₂ and Mg₁₇Al₁₂ exist in the as-cast Sb-containing alloys. Sb addition results in the precipitation of Mg₃Sb₂. The dendritic size of these alloys decreases with the addition of Sb. Both their ultimate tensile strength and yield strength of extruded alloys increase, and their elongation decreases gradually with increasing the content of Sb. The better mechanical properties of the as-extruded alloys were achieved due to the refined grains and the formation of dispersive second phases Mg₃Sb_2.

Key words: Mg-Al-Sn-Sb alloy, Microstructure, Extrusion, Second phase, Mechanical properties

Chun-Hua Ma, Fu-Sheng Pan, Ding-Fei Zhang, Ai-Tao Tang, Zhi-Wen Lu. Effects of Sb Addition on Microstructural Evolution and Mechanical Properties of Mg-9Al-5Sn Alloy[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(2): 278-288.

Figures/Tables 12

Table 1 Chemical compositions of the Mg-9Al-5Sn-xSb alloys

Samples	Composition (wt%)
Samples	Al	Sn	Sb	Mg
Mg-9Al-5Sn	10.1971	5.1017	0.0000	Bal.
Mg-9Al-5Sn-0.3Sb	9.7530	5.0231	0.1856	Bal.
Mg-9Al-5Sn-0.6Sb	9.7530	5.0231	0.5184	Bal.
Mg-9Al-5Sn-1.0Sb	9.7804	4.8612	0.7112	Bal.
Mg-9Al-5Sn-1.5Sb	9.7413	4.9465	0.9664	Bal.

Fig. 1 Optical micrographs of the as-cast Mg-9Al-5Sn-xSb alloys: a x = 0.0, b x = 0.3, c x = 0.6, d x = 1.0, e x = 1.5

Fig. 2 XRD patterns of the as-cast Mg-9Al-5Sn-xSb alloys: a x = 0.0, b x = 0.3, c x = 0.6, d x = 1.0, e x = 1.5

Fig. 3 XRD patterns of the as-cast 5# (Mg-9Al-5Sn-1.5Sb) alloys

Fig. 4 BSE images of the as-cast alloy 5# (Mg-9Al-5Sn-1.5Sb): a SEM image; b BSE images; c the corresponding EDX results of Mg-Al-Sn-Sb phase in a

Fig. 5 Optical micrographs of Mg-9Al-5Sn-xSb alloy extruded parallel to the extrusion direction: a 1#: x = 0.0; b 2#: x = 0.3; c 3#: x = 0.6; d 4#: x = 1.0; e 5#: x = 1.5

Fig. 6 SEM micrographs of as-extruded Mg-9Al-5Sn-xSb alloys: a x = 0.0; b x = 0.3; c x = 0.6; d x = 1.0; and e x = 1.5

Fig. 7 [0002] and [1010] pole figures of the Mg-9Al-5Sn-xSb extruded alloys: a 1# (x = 0.0); b 4# (x = 1.0)

Fig. 8 TEM images of extruded Mg-9Al-5Sn-1.0Sb alloy: a bright field image of precipitates; b a representative Mg2Sn particle; c the corresponding selected area electron diffraction (SAED) pattern recorded from particle indicated by orange arrow in Fig. 8b; d the corresponding EDX results of Mg2Sn phase in Fig. 8b

Fig. 9 TEM images of extruded Mg-9Al-5Sn-1.0Sb alloy along with the corresponding EDS mappings of Mg, Al, Sn and Sb elements distribution of the precipitate. a Bright field image; b EDS mapping of element Mg, Sn and Sb; c Sb; d Al; e Sn; f Mg

Fig. 10 a Nominal stress-nominal strain curves of as-extruded Mg-9Al-5Sn-xSb alloys and b tensile properties of the Mg-9Al-5Sn-xSb samples extruded at 300 °C

Table 2 Mechanical properties of t as-extruded Mg-9Al-5Sn-xSb alloys

Code	Alloys	UTS (MPa)	YS (MPa)	EL (%)
1#	Mg-9Al-5Sn-0.0Sb	339	249	4.61
2#	Mg-9Al-5Sn-0.3Sb	349	244	5.52
3#	Mg-9Al-5Sn-0.6Sb	356	230	4.48
4#	Mg-9Al-5Sn-1.0Sb	373	262	3.86
5#	Mg-9Al-5Sn-1.5Sb	355	239	3.89

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