J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (9): 1825-1830.DOI: 10.1016/j.jmst.2019.04.019
• Orginal Article • Previous Articles Next Articles
Yangtao Zhoua, Yuning Zana, Shijian Zhenga*(), Xiaohong Shaoa, Qianqian Jina, Bo Zhanga, Quanzhao Wangb, Bolv Xiaoa, Xiuliang Maac, Zongyi Maa*()
Received:
2019-03-29
Revised:
2019-04-12
Accepted:
2019-04-19
Online:
2019-09-20
Published:
2019-07-26
Contact:
Zheng Shijian,Ma Zongyi
About author:
1 These authors contributed equally to this work.
Yangtao Zhou, Yuning Zan, Shijian Zheng, Xiaohong Shao, Qianqian Jin, Bo Zhang, Quanzhao Wang, Bolv Xiao, Xiuliang Ma, Zongyi Ma. Thermally stable microstructures and mechanical properties of B4C-Al composite with in-situ formed Mg(Al)B2[J]. J. Mater. Sci. Technol., 2019, 35(9): 1825-1830.
Fig. 1. (a) Optical micrograph of the B4C-Al composite. The dark particles are B4C reinforcement which shows uniform distribution. (b) XRD pattern of the composite. Besides Al and B4C, Al3BC and MgB2 compounds can also be found.
Fig. 2. HAADF image showing the microstructures in the B4C-Al composite. Discontinuous Al3BC particles are present at the B4C/Al interface. High dense nano-rods as arrowed are observed in the alloy matrix.
Fig. 3. TEM analysis on the Mg(Al)B2 nano-rods. (a) and (b) bright-field TEM images of the nano-rod viewed along two perpendicular directions. (c) EDS profile indicates the nano-rod is composed of Mg, Al and B. (d) SAED pattern of the compound along its [0001] zone axis.
Fig. 4. (a) Stress-strain curve of the composite from tensile tests. (b) The values of yield strength and ultimate strength of the composite experienced various annealing periods. The composite shows high stability after the exposure to elevated temperature.
Fig. 6. (a) EBSD map of the grain structures in the as-rolled sample. (b) The matrix grains in the sample experienced thermal exposure for 8000 h. Equiaxed grains with an average diameter of $\widetilde{2}$.5 μm are observed.
Fig. 7. Bright-field TEM image of a Mg(Al)B2 nano-rod in the deformed sample. At both ends of the rod, the black contrast indicates the high strain state in the alloy matrix nearby. The dislocation lines are also clear seen around the nano-rod.
L-T (B4C) | GNS | Hall-Petch | L-T (Mg(Al)B2) | Orowan | |
---|---|---|---|---|---|
YS increase (MPa) | 32 | 17 | 42 | 11 | 17 |
Table 1 Estimated contributions to the YS of the composite from different strengthening mechanisms.
L-T (B4C) | GNS | Hall-Petch | L-T (Mg(Al)B2) | Orowan | |
---|---|---|---|---|---|
YS increase (MPa) | 32 | 17 | 42 | 11 | 17 |
Fig. 9. (a) A HAADF image and EDS mapping showing the Cu distribution at the Mg(Al)B2/Al interface and along the grain boundary. (b) High resolution HAADF image of the Cu-segregated Mg(Al)B2/Al interface. (c) HAADF image of the grain boundary. High concentration of Cu atoms is observed in the boundary close to the Mg(Al)B2 particle.
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