中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 30 No. 12 December 2020 |
（1. Henan Key Laboratory of High Temperature Structural and Functional Materials, Henan University of Science and Technology, Luoyang 471003, China;
2. National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials, Henan University of Science and Technology, Luoyang 471003, China;
3. China National R&D Center for Tungsten Technology, Xiamen Tungsten Corporation, Ltd., Xiamen 361000, China）
Abstract:The Mo alloys reinforced by Al2O3 particles were fabricated by hydrothermal synthesis and powder metallurgy. The microstructures of Mo-Al2O3 alloys were studied by using XRD, SEM and TEM. The results show that Al2O3 particles, existing as a stable hexagonal phase (α-Al2O3), are uniformly dispersed in Mo matrix. The ultrafine α-Al2O3 particles remarkably refine grain size and increase dislocation density of Mo alloys. Moreover, a good interfacial bonding zone between α-Al2O3 and Mo grain is obtained. The crystallographic orientations of the interface of the Al2O3 particles and Mo matrix are and . Due to the effect of secondary- phase and dislocation strengthening, the yield strength of Mo-2.0vol.%Al2O3 alloy annealed at 1200 °C is approximately 56.0% higher than that of pure Mo. The results confirm that the addition of Al2O3 particles is a promising method to improve the mechanical properties of Mo alloys.
Key words: Mo-Al2O3 alloys; hydrothermal synthesis; interface; compression test; dispersion strengthening
