J. Mater. Sci. Technol. ›› 2020, Vol. 39: 7-13.DOI: 10.1016/j.jmst.2019.07.055
• Research Article • Previous Articles Next Articles
S.J. Tsianikasa*(), Y. Chenab**(), Z. Xieac
Received:
2019-05-09
Revised:
2019-06-26
Accepted:
2019-07-27
Published:
2020-02-15
Online:
2020-03-11
Contact:
Tsianikas S.J.,Chen Y.
S.J. Tsianikas, Y. Chen, Z. Xie. Deciphering deformation mechanisms of hierarchical dual-phase CrCoNi coatings[J]. J. Mater. Sci. Technol., 2020, 39: 7-13.
Fig. 1. As-deposited CrCoNi sample; (a) EDX mapping of a selected region of the sample shown in the top-left pane. A small segment of platinum is included in the bottom-right for reference, (b) nanocolumnar structure, (c) alternating HCP and FCC phases, with twinning present, (d) perfect FCC crystal and grain boundary, and (e) FCC region with stacking faults.
Sample | Hardness (GPa) | Young’s Modulus (GPa) | Wear Parameter H/E | H3/E2 |
---|---|---|---|---|
CrCoNi/Ti (Present Study) | 9.5 ± 0.1 | 238 ± 4 | 0.0399 | 0.0151 |
CrCoNi (1 μm and 3 μm) [ | ~10 | ~250 | 0.0400 | 0.016 |
CrCoNi/Ti (1 μm and 3 μm) [ | ~9.2 | ~230 | 0.0400 | 0.014 |
CrCoNi/Ti (multilayered) [ | 7.6 ± 0.43 | 233 ± 13 | 0.033 | 0.0081 |
CrCoNi [ | 10 | 267 | 0.0375 | 0.014 |
Co19Cr19.2Fe 19.2Ni 19.1Cu23.5 [ | 3.72 | 188.5 | 0.0197 | 0.0014 |
Co13Cr12.2Fe12.4Ni13.2Cu17.7Al31.5 [ | 2.62 | 174.3 | 0.0150 | 0.00059 |
Al0.3CoCrFeNi [ | 3.33 | 216 | 0.0154 | 0.00079 |
AlCoCrFeNi [ | 10.1 | 251 | 0.0402 | 0.016 |
AlCoCrCuFeNi [ | 8.13 | 172 | 0.0473 | 0.018 |
Table 1 Nanoindentation Values obtained from this project, and values obtained from literature, with H/E and H3/E2 values.
Sample | Hardness (GPa) | Young’s Modulus (GPa) | Wear Parameter H/E | H3/E2 |
---|---|---|---|---|
CrCoNi/Ti (Present Study) | 9.5 ± 0.1 | 238 ± 4 | 0.0399 | 0.0151 |
CrCoNi (1 μm and 3 μm) [ | ~10 | ~250 | 0.0400 | 0.016 |
CrCoNi/Ti (1 μm and 3 μm) [ | ~9.2 | ~230 | 0.0400 | 0.014 |
CrCoNi/Ti (multilayered) [ | 7.6 ± 0.43 | 233 ± 13 | 0.033 | 0.0081 |
CrCoNi [ | 10 | 267 | 0.0375 | 0.014 |
Co19Cr19.2Fe 19.2Ni 19.1Cu23.5 [ | 3.72 | 188.5 | 0.0197 | 0.0014 |
Co13Cr12.2Fe12.4Ni13.2Cu17.7Al31.5 [ | 2.62 | 174.3 | 0.0150 | 0.00059 |
Al0.3CoCrFeNi [ | 3.33 | 216 | 0.0154 | 0.00079 |
AlCoCrFeNi [ | 10.1 | 251 | 0.0402 | 0.016 |
AlCoCrCuFeNi [ | 8.13 | 172 | 0.0473 | 0.018 |
Fig. 2. Samples after deformation; (a) indent site showing pile-up; (b & c) microstructures after deformation of 400 mN (b) and 200 mN (c); (d & e) STEM image of nanograins obtained ~1 μm below the sample surface showing an equiaxed grain for 400 mN (d) and twin/matrix lamellae for 200 mN (e), and; (f) dislocations (marked by white ⊥ symbols) at the grain boundary of a nanograin.
Fig. 3. (a) Shear band region, visible by its very distinguishable edges. STEM images (b) depict the edge of the shear band region and (c) reveal the structure inside the shear band as FCC, with twin/matrix lamellae.
Fig. 4. Generalised deformation mechanism of the CrCoNi coating: (a) pristine columnar structure, HCP/FCC regions and presence of stacking faults and twin boundaries; (b) partial deformation caused by 200 mN showing grain refinement onset beneath the indent site with phase transformation and elimination of some planar defects in nanograins, and; (c) heavy deformation induced by 400 mN, showing further elimination of planar defects in nanograins, and shear band formation.
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