Acta Metallurgica Sinica (English Letters) ›› 2021, Vol. 34 ›› Issue (1): 12-24.DOI: 10.1007/s40195-020-01122-z
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Meichen Liang1, Hao Zhang1, Lifeng Zhang1, Peng Xue1, Dingrui Ni1, Weizhen Wang1, Zongyi Ma1, Hengqiang Ye1,2, Zhiqing Yang1()
Received:
2020-04-29
Revised:
2020-06-04
Accepted:
2020-06-18
Online:
2021-01-10
Published:
2021-01-28
Contact:
Zhiqing Yang
Meichen Liang, Hao Zhang, Lifeng Zhang, Peng Xue, Dingrui Ni, Weizhen Wang, Zongyi Ma, Hengqiang Ye, Zhiqing Yang. Evolution of Quasicrystals and Long-Period Stacking Ordered Structures During Severe Plastic Deformation and Mixing of Dissimilar Mg Alloys Upon Friction Stir Welding[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(1): 12-24.
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Fig. 1 Schematic illustration of experiments: a friction stir welding, b Vickers microhardness measurement, c geometry and size of tensile specimens in mm
Fig. 2 a Optical macrograph of the Mg95.8Zn3.6Gd0.6/Mg97Cu1Y2 FSW joint; BM stands for base materials. b Magnified optical macrograph of the FSW SZ, showing the position of tensile specimensFull size image
Fig. 3 BSE-SEM micrographs for a Mg95.8Zn3.6Gd0.6, b Mg97Cu1Y2. Insets in a, b show SAED patterns recorded along the fivefold axis of IQCs and the [1120] zone axis of LPSO plates
Fig. 4 a, b BSE-SEM micrographs for TMAZ at AS and RS, respectively. c, d Magnified images for regions indicated by black rectangles in a, b, respectively
Fig. 5 Microstructure of TMAZ near the TMAZ/SZ interface at the advancing side: a a low-magnification image showing breakup of IQCs, inset SAED patterns for particles indicated by black arrows along the fivefold axis, b W-phase and IQC particles with random orientation. c, d A TEM image and corresponding composite SAED pattern showing IQC and W particles with a specific orientation relationship
Fig. 6 Microstructure of TMAZ near the TMAZ/SZ interface at the retreating side: a a low-magnification image showing bending and fracture of a thick LPSO plate, and an inset SAED pattern recorded along the [11$\overline{2}$0] zone axis, b a magnified image showing small lamellae within Mg matrix adjacent to one thick18R-LPSO plate. c, d High-resolution TEM images for regions containing 14H-LPSO lamellae and surrounding α-Mg matrix. Inset in d is a corresponding composite SAED pattern recorded along the [11$\overline{2}$0] zone axis of the 14H-LPSO lamella, and diffraction spots from adjacent Mg matrix are indicated by dotted circlesFull size image
Fig. 7 a A low-magnification SEM micrograph of the SZ, b a BSE-SEM micrograph of the center region. c, d Magnified BSE-SEM micrographs for the center region and onion rings, respectively
Fig. 8 SEM GB maps of a center region, b layers of onion rings at advancing side, c layers of onion rings at retreating side. d-f Statistical results of grain sizes in the center region, particle-rich and lamella-rich layers in the onion-ring region, respectively
Fig. 9 Low-magnification STEM images for a particle-rich center region and b onion rings. c-e SAED patterns of W-phase particles along the [001], [011] and [$\overline{1}$11] zone axis, respectively. f SAED pattern of lamella phases in the lamella-rich layer along the [11 $\overline{2}$ 0] zone axis
Fig. 10 a A low-magnification HAADF-STEM image for nanoprecipitates in Mg matrix, b an atomic resolution HAADF-STEM image recorded along the [0001]Mg zone axis for a region with a precipitate
BM | TMAZ (AS) | Interface (AS) | SZ | Interface (RS) | TMAZ (RS) | BM |
---|---|---|---|---|---|---|
73.7 ± 1.6 (82.2 ± 3.1) | 76.4 ± 2.3 | 82.9 ± 6.1 | 83.9 ± 2.6 | 94.4 ± 14.4 | 74.0 ± 6.6 | 66.7 ± 1.6 (104.0 ± 3.2) |
Table 1 Vickers microhardness for the SZ, severely deformed regions ~ 150 μm wide in the TMAZ next to the TMAZ/SZ interfaces (referred to as interface for short), Mg matrix in TMAZ and BM. Microhardness for IQC and LPSO in BM is shown in the corresponding bracket
BM | TMAZ (AS) | Interface (AS) | SZ | Interface (RS) | TMAZ (RS) | BM |
---|---|---|---|---|---|---|
73.7 ± 1.6 (82.2 ± 3.1) | 76.4 ± 2.3 | 82.9 ± 6.1 | 83.9 ± 2.6 | 94.4 ± 14.4 | 74.0 ± 6.6 | 66.7 ± 1.6 (104.0 ± 3.2) |
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