Hot Compression Mechanical Behavior of Solution Heat-Treated and Pre-aged Mg-Zn-Gd-Er Alloys

doi:10.1007/s40195-022-01482-8

Abstract

Abstract:

The mechanical behavior of solution heat-treated and pre-aged Mg-6Zn-1Gd-1Er alloys during hot compression (from 180 to 330 °C) has been investigated. The results showed that the flow stress curves of the pre-aged sample (PAS) intersected with that of the solution heat-treated sample (SHTS) during hot compression. At 180 °C, when the true strain is 0.27 and 0.47, the PAS showed larger and smaller stress (210.80 MPa vs. 207.58 MPa and 205.67 MPa vs. 207.93 MPa) than the SHTS, respectively. These phenomena were due to the stronger interaction of W phase and dislocations/twins under the strain of 0.27, while dynamic recrystallization softening occurred under the strain of 0.47. When the temperature increased to 330 °C, the flow stress of PAS and SHTS showed an opposite trend to that of 180 °C. Continuous dynamic recrystallization and particle stimulated nucleation based on slip operations are the main deformation mechanisms under 330 °C. At the true strain is 0.33 and 0.53, the PAS has smaller and larger stress (61.32 MPa vs. 63.69 MPa and 58.75 MPa vs. 57.09 MPa) than the SHTS, respectively. The increasing deformation resistance of dynamic precipitation improved the flow stress under smaller strain and dynamic recrystallization decreased the flow stress under high strain, which resulted the opposite phenomena of SHTS.

Key words: Mg-6Zn-1Gd-1Er alloy, Mechanical behavior, Precipitates, Twin, Dynamic recrystallization

Bo Che, Liwei Lu, Longfei Liu, Yan Yang, Wei Kang, Jun Luo, Zhiqiang Wu, Yongfeng Qiu. Hot Compression Mechanical Behavior of Solution Heat-Treated and Pre-aged Mg-Zn-Gd-Er Alloys[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(3): 469-485.

Figures/Tables 13

Table 1 Chemical composition of the Mg-6Zn-1Gd-1Er alloy (wt%)

Zn	Gd	Er	Mg
4-7	0.3-1.2	0.3-1.2	Bal.

Fig. 1 Flow of the first and second groups of hot compression experiments

Fig. 2 Microstructures of Mg-6Zn-1Gd-1Er alloy: a as-cast sample, b SEM image of as-cast sample, c solution heat-treated sample, d pre-aged sample

Fig. 3 True compression stress-strain curves of solution heat-treated and pre-aged samples at different temperatures: a 180 °C, b 230 °C, c 280 °C, d 330 °C

Fig. 4 XRD patterns at different temperatures: a 180 °C, c 330 °C; b and d the enlarged XRD patterns of the dashed boxes in a and c, respectively

Fig. 5 OM and SEM images of solution heat-treated and pre-aged samples compressed at different temperatures: a, b 180 °C, c-f 330 °C

Fig. 6 EBSD characteristics of compressed sample at 180 °C to a strain level of 0.47: a, c solution heat-treated sample, b, d pre-aged sample

Fig. 7 Twinning behavior of regions R1 a-c, R2 d-f, R3 g-i. Here, R1-R3 are selected in Fig. 6a

Fig. 8 EBSD characteristics of regions R4 a-c, and R5 d in Fig. 6b. e Line graph of misorientation angle along the red arrow

Fig. 9 EBSD characteristics of compressed sample at 330 °C to a strain level of 0.33: a, c solution heat-treated sample, b, d pre-aged sample

Fig. 10 EBSD characteristics of regions R2 a, R1 b and R3 c in Fig. 9a. d, e Line graph of misorientation angle along the red arrow

Fig. 11 EBSD characteristics of regions R6 a, R4 b, c, R7 d, R8 f and R5 g in Fig. 9b. e, h Line graph of misorientation angle along the red arrow

Fig. 12 TEM images of compressed sample at 330 °C to a strain level of 0.33: a dislocation-precipitate interactions, b dislocation tangle, c sub-grain boundary, d sub-grain

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