J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 957-961.DOI: 10.1016/j.jmst.2018.12.002
Bin Gana, Jeffrey M. Wheelerb, Zhongnan Bic*(), Lin Liua, Jun Zhanga, Hengzhi Fua
Received:
2018-07-01
Revised:
2018-08-13
Accepted:
2018-08-27
Online:
2019-06-20
Published:
2019-06-19
Contact:
Bi Zhongnan
About author:
1The authors contributed equally to this work.
Bin Gan, Jeffrey M. Wheeler, Zhongnan Bi, Lin Liu, Jun Zhang, Hengzhi Fu. Superb cryogenic strength of equiatomic CrCoNi derived from gradient hierarchical microstructure[J]. J. Mater. Sci. Technol., 2019, 35(6): 957-961.
Fig. 1. (a) Orientation imaging microscopy map generated by EBSD showing grain structure of the center of CrCoNi MEA tensile rod, (b) EBSD map of the edge of wrought CrCoNi MEA tensile rod after a pre-torsion treatment.
Fig. 2. (a)-(d), Backscatter Electron Images of the sample with a pre-torsion treatment from the center to the edge, (e) picture of the pre-torsioned sample with a diameter of 9 mm, (f) hardness gradient in the radial direction of sample after the pre-torsion.
Fig. 3. Engineering stress-engineering strain curves of CrCoNi alloys with and without the pre-torsion treatments in the liquid N2 environments as well as that of the recrystallized CrCoNi alloys tested at room temperature.
Fig. 4. (a) SEM micrograph of the microstructure of the edge of CrCoNi MEA with pre-torsion, (b) SEM image of the edge of CrCoNi MEA after torsion and tension tests.
Fig. 5. (a) TEM bright field image of the tensile bar with a beam direction of [111], showing the intersections of slip bands with an orientation of <011 > , (b) TEM bright field image showing the presence of stacking faults, (c) TEM bright field image of the slip bands with a beam direction of [001], (d) TEM dark field image showing the high dislocations density in the slip bands, (e) a high resolution image of the region with a yellow square, (f) TEM bright field of the region containing a high density of nanotwins with a beam direction of [011], (g) the corresponding diffraction pattern showing the twinning spots, (h) a high resolution image showing the presence of nanotwins.
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