J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (4): 599-604.DOI: 10.1016/j.jmst.2017.11.035
Special Issue: Nanomaterials 2018
• Orginal Article • Previous Articles Next Articles
G.B. Shan, Y.Z. Chen*(), M.M. Gong, H. Dong, B. Li, F. Liu*()
Received:
2017-05-03
Revised:
2017-09-12
Accepted:
2017-09-13
Online:
2018-04-20
Published:
2018-05-04
Contact:
Chen Y.Z.,Liu F.
G.B. Shan, Y.Z. Chen, M.M. Gong, H. Dong, B. Li, F. Liu. Influence of Al2O3 particle pinning on thermal stability of nanocrystalline Fe[J]. J. Mater. Sci. Technol., 2018, 34(4): 599-604.
Samples | A | B | C | D | E | F |
---|---|---|---|---|---|---|
Initial particle size | 10 nm | 500 nm | ||||
Al2O3 (wt%) | 0.2 | 0.5 | 1 | 0.2 | 0.5 | 1 |
Al2O3 (at.%) | 0.11 | 0.28 | 0.55 | 0.11 | 0.28 | 0.55 |
Table 1 Amounts and IPSs of the Al2O3 nanoparticle precursors of the NC Fe-Al2O3 composites labeled by A-F.
Samples | A | B | C | D | E | F |
---|---|---|---|---|---|---|
Initial particle size | 10 nm | 500 nm | ||||
Al2O3 (wt%) | 0.2 | 0.5 | 1 | 0.2 | 0.5 | 1 |
Al2O3 (at.%) | 0.11 | 0.28 | 0.55 | 0.11 | 0.28 | 0.55 |
Fig. 1. Measured XRD patterns of the ball milled and annealed composite C obtained by integrating the Debye-Scherrer ring patterns recorded by the 2-dimensional detector, (a) the XRD patterns of the ball milled sample and the samples annealed at different temperatures for 60 min, and (b) the XRD patterns of the ball milled sample and the samples annealed at 773 K for different time periods. The intensity-axis is shown in a logarithmic form.
Fig. 2. Typical TEM images of the composites C and F. (a) and (b) are a bright field image of and a dark field image of the composite Fe in the ball milled state. (c)-(e) correspond to the composite C annealed at 773 K for 120 min, showing a bright field image of the microstructure (c), a dark field image of NC Fe (d), and a dark field image of Al2O3 (e). (f)-(i) correspond to the composite F annealed at 773 K for 120 min, showing a bright field image of the microstructure (f), a dark field image of NC Fe (g), and a dark field image of Al2O3 (h). Noting the differences in scale bars.
Samples | DXRD (nm) | DTEM (nm) |
---|---|---|
Composite F in the ball milled state | 9 | 16 |
Composite C annealed at 773 K for 120 min | 25 | 34 |
Composite F annealed at 773 K for 120 min | 39 | 49 |
Table 2 Comparisons of the grain sizes determined by the XRD line profile analyses and TEM dark field images of three different samples.
Samples | DXRD (nm) | DTEM (nm) |
---|---|---|
Composite F in the ball milled state | 9 | 16 |
Composite C annealed at 773 K for 120 min | 25 | 34 |
Composite F annealed at 773 K for 120 min | 39 | 49 |
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