Microstructures and Mechanical Properties of Mg-xAl-1Sn-0.3Mn (x = 1, 3, 5) Alloy Sheets

doi:10.1007/s40195-020-01034-y

Abstract

Abstract:

The influence of Al alloying on the microstructures and the mechanical properties of Mg-xAl-1Sn-0.3Mn alloy sheets was investigated. The microstructure of Mg-xAl-1Sn-0.3Mn consisted of α-Mg and Mg₁₇Al₁₂ precipitates. Alloying with Al increased the amount of Mg₁₇Al₁₂ and the average grain size. Uniaxial tensile tests were carried out along the extrusion direction (ED), the transverse direction (TD) and 45° toward the ED. Mg-5Al-1Sn-0.3Mn alloy sheet exhibited the best combination of mechanical properties along the ED: a yield strength of 142 MPa, an ultimate tensile strength of 282 MPa and an elongation of 23%. The good performance of Mg-5Al-1Sn-0.3Mn sheet was mainly attributed to the large quantity of Mg₁₇Al₁₂ precipitates and a weak basal texture. Annealing caused static dynamic recrystallization, refined the grain size and enhanced the mechanical properties: yield strength of 186 MPa, ultimate tensile strength of 304 MPa, elongation of 21% along ED. Both strength and ductility were enhanced by Al alloying.

Key words: Mg-xAl-1Sn-0.3Mn alloys, Extrusion, Microstructure, Mechanical properties

Chao-Yue Zhao, Xian-Hua Chen, Peng Peng, Teng Tu, Andrej Atrens, Fu-Sheng Pan. Microstructures and Mechanical Properties of Mg-xAl-1Sn-0.3Mn (x = 1, 3, 5) Alloy Sheets[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(9): 1217-1225.

Figures/Tables 9

Table 1 Nominal chemical compositions of studied alloys (wt%)

Alloy	Al	Sn	Mn	Mg
ATM110	1	1	0.3	Bal
ATM310	3	1	0.3	Bal
ATM510	5	1	0.3	Bal

Fig. 1 Optical microstructures and the XRD patterns of as-cast Mg-xAl-1Sn-0.3Mn alloys: a ATM110, b ATM310, c ATM510 d XRD patterns

Fig. 2 Optical microstructures and (0002) pole figures of as-extruded Mg-xAl-1Sn-0.3Mn alloys: a, d ATM110, b, e ATM310 c, f ATM510

Fig. 3 Tensile engineering stress-strain curves of as-extruded Mg-xAl-1Sn-0.3Mn alloy sheets

Fig. 4 Tensile engineering stress-strain curves of as-extruded Mg-xAl-1Sn-0.3Mn alloy sheets in three different sheet directions (0°, 45 and 90°): a ATM110, b ATM510, c ATM510 d anisotropy factor

Fig. 5 Optical microstructures of annealing-extruded Mg-5Al-1Sn-0.3Mn alloy sheets: a A0-ATM510, b A15-ATM510, c A30-ATM510 d A60-ATM510

Fig. 6 EBSD maps showing grains and kernel average misorientation in a A0-ATM510 and c A30-ATM510, (0002) pole figures of alloys, b A0-ATM510, d A30-ATM510, the TEM images of e, f A0-ATM510 g A30-ATM510 alloy sheets

Fig. 7 a Tensile engineering stress-strain curves of Mg-5Al-1Sn-0.3Mn alloy sheets with different annealing times, mechanical properties before and after annealing for 30 min: b ATM110, c ATM310 d ATM510

Table 2 Reported mechanical properties of Al-containing or RE-containing Mg alloys in comparison with the as-extruded alloy in this work

Alloys (wt%)	Process	YS (MPa)	UTS (MPa)	ε (%)	References
ATM510	Extruded	142	282	22.7	This work
ATM510	Extruded + annealed	186	304	20.7	This work
AZ61	Extruded	206	297	13	[27]
AZ61	Extruded + aged	204	294	15	[27]
Mg-5Al-2Nd-0.2Mn	Extruded	158	271	22.2	[28]
Mg-6Gd-2.5Y-0.5Zr	Extruded	167	264	25.1	[29]
Mg-6Gd-2.5Y-0.5Zr	Extruded + aged	177	266	18.1	[29]
Mg-6.5Gd-1.3Nd-0.7Y-0.3Zn	Extruded + aged	201	310	5.8	[30]

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