Influence of Zn Content on Microstructure and Tensile Properties of Mg-Zn-Y-Nd Alloy

doi:10.1007/s40195-018-0713-9

Abstract

Abstract:

In the present study, the effect of Zn content on the microstructure and deformation behavior of the as-cast Mg-Zn-Y-Nd alloy has been investigated. The results showed that as Zn content increased, the volume fraction of secondary phases increased. Moreover, the phase transformation from W-phase to W-phase and I-phase occurred. In the as-cast state, W-phase exists as eutectic and large block form. When Zn content increases to 6 and 8% (wt%), small I-phase could precipitate around W-phase particles. Additionally, the effect of Zn content on the tensile properties and deformation behavior varies with the testing temperature. At room temperature, the tensile strength increases with Zn content, whereas the elongation increases initially and then decreases. At 250 °C, as Zn content increases, the tensile strength decreases initially and then increases slightly, whereas the elongation decreases. At 350 °C, the elongation increases with Zn content, whereas the tensile strength decreases initially and then increases slightly.

Key words: Mg-Zn-Y-Nd alloy, Zn content, Microstructure, Tensile performance

Bei-Ning Du, Zi-Yang Hu, Li-Yuan Sheng, Dao-Kui Xu, Yu-Feng Zheng, Ting-Fei Xi. Influence of Zn Content on Microstructure and Tensile Properties of Mg-Zn-Y-Nd Alloy[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(4): 351-361.

Figures/Tables 14

Fig. 1 Schematic diagrams of standard tensile specimen

Fig. 2 SEM images of cast Mg-4Zn-1.2Y-0.8Nd a, d, Mg-6Zn-1.2Y-0.8Nd b, e, Mg-8Zn-1.2Y-0.8Nd c, f at low a-c, high d-f magnification

Fig. 3 XRD patterns of as-cast Mg-4Zn-1.2Y-0.8Nd a, Mg-6Zn-1.2Y-0.8Nd b, Mg-8Zn-1.2Y-0.8Nd c

Fig. 4 SEM images of eutectic a, large block precipitate b in as-cast Mg-6Zn-1.2Y-0.8Nd alloy

Table 1 EDS results of positions A and B in Fig. 4

Element	wt%	at.%
Mg	38.47	67.25
Zn	31.74	20.64
Y	18.21	8.71
Nd	11.57	3.41

Table 2 EDS results of position C in Fig. 4

Element	wt%	at.%
Mg	19.66	42.47
Zn	59.25	47.43
Y	10.59	6.26
Nd	10.50	3.82

Fig. 5 Bright-field TEM image a, selected area electronic diffraction (SAED) patterns b-e of cubic phase in as-cast Mg-6Zn-1.2Y-0.8Nd alloy

Table 3 EDS results of cubic phase in Fig. 5

Element	wt%	at.%
Mg	14.47	38.30
Zn	2.29	2.25
Y	80.48	58.22
Nd	2.76	1.23

Fig. 6 Bright-field TEM image a, SAED patterns b-d of strip phase at grain boundary of as-cast Mg-4Zn-1.2Y-0.8Nd alloy

Fig. 7 Tensile test results of Mg-Zn-Y-Nd alloys with different Zn contents: a tensile strength; b elongation

Fig. 8 SEM images of fracture surfaces of specimens after tensile test at different temperatures: a Mg-4Zn-1.2Y-0.8Nd alloy at room temperature; b Mg-8Zn-1.2Y-0.8Nd alloy at room temperature; c Mg-6Zn-1.2Y-0.8Nd alloy at 250 °C; d Mg-8Zn-1.2Y-0.8Nd alloy at 350 °C

Fig. 9 SEM images of longitudinal section of fracture surfaces of specimens after tensile test at different temperatures: a Mg-4Zn-1.2Y-0.8Nd alloy at room temperature; b Mg-6Zn-1.2Y-0.8Nd alloy at room temperature; c Mg-4Zn-1.2Y-0.8Nd alloy at 250 °C; d Mg-6Zn-1.2Y-0.8Nd alloy at 250 °C; e Mg-4Zn-1.2Y-0.8Nd alloy at 350 °C; f Mg-6Zn-1.2Y-0.8Nd alloy at 350 °C

Fig. 10 DSC curves of Mg-Zn-Y-Nd alloys with different Zn contents

Fig. 11 Schematic diagrams of precipitation of secondary phases in Mg-Zn-Y-Nd alloy with different Zn contents: a morphology of grain and dendrite; element segregation and secondary phase precipitation at the grain boundary and interdendritic regions in 4Zn b, 6Zn c, 8Zn d alloys (b-d shows the magnification of the area with blue-dashed box in a)

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