J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (4): 473-482.DOI: 10.1016/j.jmst.2018.10.010
• Orginal Article • Previous Articles Next Articles
Sang-Hoon Kima, Jeong Hun Leeb, Chong Soo Leec, Jonghun Yoond, Sung Hyuk Parka*()
Received:
2018-04-30
Accepted:
2018-05-22
Online:
2019-04-05
Published:
2019-01-28
Contact:
Hyuk Park Sung
Sang-Hoon Kim, Jeong Hun Lee, Chong Soo Lee, Jonghun Yoon, Sung Hyuk Park. Dynamic deformation behavior and microstructural evolution during high-speed rolling of Mg alloy having non-basal texture[J]. J. Mater. Sci. Technol., 2019, 35(4): 473-482.
Fig. 1. (a) Schematic illustration depicting a sample for HSR machined from a hot-rolled plate and (b) its dimensions and sample coordinate system. (c) Optical micrograph and (d) XRD pole figure of initial sample for HSR. davg denotes the average grain size.
Rolling reduction | Process parameters | Microstructural characteristics | |||||
---|---|---|---|---|---|---|---|
Strain | Strain rate (s-1) | fDRX (%) | davr (μm) | dDRX (μm) | dunDRX (μm) | Imax | |
20% | 0.22 | 91 | 3.9 | 17.4 | 3.8 | 18.4 | 6.5 |
40% | 0.51 | 128 | 35.4 | 9.4 | 3.7 | 13 | 4.9 |
60% | 0.92 | 157 | 61.8 | 5.2 | 3.4 | 8.1 | 8.2 |
80% | 1.61 | 181 | 89.9 | 4.7 | 4.5 | 6.4 | 6.6 |
Table 1 Process parameters of high-speed rolling and microstructural characteristics of high-speed-rolled samples with different rolling reductions.
Rolling reduction | Process parameters | Microstructural characteristics | |||||
---|---|---|---|---|---|---|---|
Strain | Strain rate (s-1) | fDRX (%) | davr (μm) | dDRX (μm) | dunDRX (μm) | Imax | |
20% | 0.22 | 91 | 3.9 | 17.4 | 3.8 | 18.4 | 6.5 |
40% | 0.51 | 128 | 35.4 | 9.4 | 3.7 | 13 | 4.9 |
60% | 0.92 | 157 | 61.8 | 5.2 | 3.4 | 8.1 | 8.2 |
80% | 1.61 | 181 | 89.9 | 4.7 | 4.5 | 6.4 | 6.6 |
Fig. 3. Inverse pole figure maps of (a) initial sample and (b-e) HSRed samples with rolling reductions of (b) 20%, (c) 40%, (d) 60%, and (e) 80%. davg denotes the average grain size.
Fig. 4. Inverse pole figure maps of (a-d) DRXed and (e-h) unDRXed regions of HSRed samples with rolling reductions of (a, e) 20%, (b, f) 40%, (c, g) 60%, and (d, h) 80%. fDRX and funDRX denote the area fractions of DRXed and unDRXed regions, respectively.
Fig. 6. Inverse pole figure maps and (0001) and (10-10) pole figures of (a) untwinned matrix region and (b) twinned region of 20% HSRed sample. (c) Misorientation map showing {10-12} twin boundaries and misorientation angle distribution of 20% HSRed sample.
Fig. 7. Inverse pole figure maps showing (a) partially and (c) completely twinned grains of 20% HSRed sample. (b, d) Point-to-point misorientation line profiles along directions indicated by arrows in (a) and (c). M, ET, CT, and DT denote the matrix, {10-12} extension twin, {10-11} contraction twin, and {10-11}-{10-12} twin, respectively.
Fig. 8. Inverse pole figure maps showing DRXed grains formed at {10-11} contraction and {10-11}-{10-12} double twins in 40% HSRed sample: (a) total region, (b) DRXed region, and (c) unDRXed region. The blue and yellow arrows in (c) indicate the {10-11} contraction twins and {10-11}-{10-12} double twins, respectively, which are formed in the {10-12} extension twin (ET).
Fig. 9. Inverse pole figure maps showing untwinned matrix and {10-12} twins remaining without occurrence of DRX in 60% HSRed sample: (a, d) total region, (b, e) DRXed region, and (c, f) unDRXed region. M and ET denote the matrix and {10-12} extension twin, respectively.
Fig. 10. Misorientation angle map showing high-angle grain boundaries and various twin boundaries in HSRed samples with rolling reductions of (a) 20%, (b) 40%, (c) 60%, and (d) 80%. (e) Variation in length per unit area of twin boundaries with imposed rolling reduction.
Fig. 11. (a-d) Kernel average misorientation (KAM) maps and (e-h) grain orientation spread (GOS) maps of HSRed samples with rolling reductions of (a, e) 20%, (b, f) 40%, (c, g) 60%, and (d, h) 80%. KAMavg and GOSavg denote the average KAM and GOS values, respectively.
Fig. 12. (0002) and (10-1) Pole figures of total, unDRXed, and DRXed regions of initial sample and HSRed samples. The numbers on the (0001) pole figures are the maximum intensity values of the basal texture.
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