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42. The influence of surface orientation on the wetting and reaction at the Al/MgAl2O4 interfaces.

Author

Guo, Rui-Fen, Shen, Ping, Zang, Juan, Ma, Yun-Hai, and Jiang, Qi-Chuan

Subjects
*WETTING, *CRYSTAL orientation, *INTERFACIAL reactions, *SINGLE crystals, *CONTACT angle, *SURFACE temperature
Abstract

The wetting of (100), (110) and (111) MgAl 2 O 4 single crystals by molten Al at 1073–1273 K in vacuum was investigated using a dispensed sessile drop method to determine the effect of the substrate orientation on the wettability and reaction in this system. This system is non-wetting in nature. The initial contact angles are generally in the range of 96–106°, slightly decreasing with increasing temperature but without significant dependence on the MgAl 2 O 4 surface orientation. However, the interfacial reaction is sensitive to the MgAl 2 O 4 surface orientation and temperature. No reaction product was observed at 1073 K while the thickness of the Al 2 O 3 product layer was in the order of (100) > (110) > (111) at 1173 K and 1273 K. During the reactive wetting process, significant reconstruction and "whisker growth" occurred at the periphery of the triple line due to the stress created at the substrate surface as a result of volume change between the reactant and product, and the morphology of the "whiskers" was closely related to the MgAl 2 O 4 crystal orientation. The formation of these "whiskers" not only affected the wetting behavior but also weakened the dependence of the wettability on the MgAl 2 O 4 surface orientation. [ABSTRACT FROM AUTHOR]

Published
2019
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50. High compressive strength in nacre-inspired Al−7Si−5Cu/Al2O3–ZrO2 composites at room and elevated temperatures by regulating interfacial reaction.

Author

Guo, Rui-Fen, Shen, Ping, Li, Shi-Xin, Shaga, Alateng, and Jiang, Qi-Chuan

Subjects
*ALUMINUM compounds, *COMPRESSIVE strength, *ZIRCONIUM oxide, *COMPOSITE materials, *HIGH temperatures, *INTERFACIAL reactions
Abstract

Al−7Si−5Cu/Al 2 O 3 −ZrO 2 composites with nacre-like structures were prepared via ice-templating and gas pressure infiltration techniques. The composites were subsequently heat-treated at 850 °C for 0, 30, 60, 90 and 120 min to regulate the interfacial reaction between Al and ZrO 2 . The yield of larger (Al 1−m , Si m ) 3 Zr and ZrSi 2 phases increased with longer dwell times. The compressive strength initially increased and then decreased. The highest strength was observed in composites treated for 60 min and reached 1600±40, 1261±30 and 1033±22 MPa at temperatures of 20, 150 and 300 °C, respectively. These values increased by 30−40% as compared to those of the non-treated counterparts and were 2-, 5- and 12-fold more than those of the matrix alloy, respectively, which is demonstrative of the material's excellent load-bearing capacity, particularly at elevated temperatures. [ABSTRACT FROM AUTHOR]

Published
2017
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