Preparation and properties of high-strength molybdenum alloy sheets doped with Al2O3 particles

• Published in: Rare metals 2018-12, Vol.37 (12), p.1046-1054
• Main Authors: Zhou, Yu-Cheng, Gao, Yi-Min, Wei, Shi-Zhong, Hu, Ya-Jie
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Annealing; Biomaterials; Chemistry and Materials Science; Elongation; Energy; High strength alloys; Materials Engineering; Materials Science; Metal sheets; Metallic Materials; Molybdenum; Molybdenum base alloys; Nanoscale Science and Technology; Physical Chemistry; Powder metallurgy; Recrystallization
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-016-0726-3

The pure molybdenum sheet and the Al 2 O 3 -doped molybdenum alloy sheets were prepared by the hydrothermal method and a subsequent powder metallurgy process. The effects of Al 2 O 3 particles addition on the recrystallization temperature, microstructures and properties of the Mo sheets were investigated as the focus. The Al 2 O 3 -doped Mo sheets have greater strength than the pure Mo sheet, and the 0.50 wt% Al 2 O 3 -doped Mo sheet has the best performance. For the unannealed specimens, the strength increases with the increase in Al 2 O 3 content. Compared with that of pure Mo sheet, the strength of 0.50 wt% Al 2 O 3 -doped Mo sheet increases by 72 %, 54 %, 73 % and 76 %, respectively, when annealed at 1000, 1100, 1200 and 1300 °C, which is a very obvious reinforcement effect. When lower than 1100 °C, the elongation of the pure Mo sheet is the best. However, when the annealing temperature is equal to or greater than 1100 °C, the 0.50 wt% Al 2 O 3 -doped Mo sheet obtains the best elongation. Moreover, the Al 2 O 3 addition can greatly improve the recrystallization temperature of molybdenum sheets; for example, the recrystallization temperature of the 0.50 wt% Al 2 O 3 -doped Mo sheet increases by 200 °C at least than that of the pure Mo sheet. Lastly, the strengthening mechanism was discussed.