J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (2): 311-316.DOI: 10.1016/j.jmst.2017.07.023
Special Issue: High Strength Alloys-2018
• Orginal Article • Previous Articles Next Articles
counterpartK. Li, V.S.Y. Injeti, P. Trivedi, L.E. Murr, R.D.K. Misra()
Received:
2017-07-14
Accepted:
2017-07-28
Online:
2018-02-10
Published:
2018-02-10
counterpartK. Li, V.S.Y. Injeti, P. Trivedi, L.E. Murr, R.D.K. Misra. Nanoscale deformation of multiaxially forged ultrafine-grained Mg-2Zn-2Gd alloy with high strength-high ductility combination and comparison with the coarse-grained counterpart[J]. J. Mater. Sci. Technol., 2018, 34(2): 311-316.
Fig. 2. Microstructures of as-cast + annealed alloy referred as coarse-grained (CG) (a) and as-cast + annealed + multiaxially forged referred as ultrafine-grained (UFG) Mg-2Zn-2Gd alloy (b). (c) Transmission electron micrograph illustrating size range of the Mg3Zn3Gd precipitates in α-Mg matrix, as confirmed by (d) electron diffraction pattern.
Property | Grain Size | YS (MPa) | UTS (MPa) | Elongation (%) |
---|---|---|---|---|
Coarse-grained (CG) Alloy (As-cast + 500 °C Annealed) | 44 ± 5 μm | 46 ± 2 | 70 ± 2 | 7 ± 1 |
Ultrafine-grained (UFG) Alloy (As-cast + 500 °C annealed + MAF) | 416 ± 140 nm | 227 ± 2 | 272 ± 1 | 30 ± 2 |
Table 1 Average grain size and mechanical properties of CG (as-cast + annealed) and UFG (as-cast + annealed + MAF) (multiaxially forged, 2 passes) Mg-2Zn-2Gd alloy.
Property | Grain Size | YS (MPa) | UTS (MPa) | Elongation (%) |
---|---|---|---|---|
Coarse-grained (CG) Alloy (As-cast + 500 °C Annealed) | 44 ± 5 μm | 46 ± 2 | 70 ± 2 | 7 ± 1 |
Ultrafine-grained (UFG) Alloy (As-cast + 500 °C annealed + MAF) | 416 ± 140 nm | 227 ± 2 | 272 ± 1 | 30 ± 2 |
Fig. 3. Representative load-displacement plots for UFG and CG Mg-2Zn-2Gd alloy acquired via nanoindentation experiments in the load-controlled mode with a Berkovich indenter of radius 20 nm (maximum load of 0.5 mN and loading rate of 2 μN/s).
Fig. 4. Representative bright field (a) and dark field (b) transmission electron micrographs illustrating high density of dislocations in the plastic zone surrounding the indentation (top-right corner) ultrafine-grained (UFG: as-cast + annealed + multiaxially forged) Mg-2Zn-2Gd alloy. Zones 1 and 2 have high density of dislocations and zones 3A and 3 B illustrate dislocations emitted by the grain boundary. (c) SAED pattern for grain in (a) and (b) showing [0002] showing operating reflection.
Fig. 5. (a, b) Transmission electron micrograph of the plastic deformation zone surrounding the indentation showing the occurrence of twinning in the CG Mg-2Zn-2Gd alloy and the diffraction pattern. (b) Another illustration of twinning in the CG alloy. Diffraction pattern was similar to a (ii). From the diffraction pattern, the twin {11ˉ01} <01ˉ12> belongs to the family of {101ˉ1} <101ˉ2> compression twin. a(i) and a(ii) show original and enlarged (and indexed) SAED pattern for (a).
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