中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 10 October 2023 |
（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. Beijing National Innovation Institute of Lightweight Ltd., China Academy of Machinery Science and Technology, Beijing 100089, China）
Abstract:Three kinds of molybdenum alloy are doped with 2.0 wt.% different ultrafine oxide particles (Al2O3, ZrO2 and La2O3) via hydrothermal synthesis, co-precipitation, co-decomposition, powder metallurgy, and rotary swaging. Three nano-oxides refine molybdenum grains by more than 70% and change the fracture modes from brittle fracture to ductile fracture, thereby dramatically improving the integrated mechanical properties of the alloys. Moreover, the trade-off between strength and ductility is offset. Mo-ZrO2 alloy has the highest strength and plasticity, which is attributed to fine ZrO2 particles and a semi-coherent interface between ZrO2 and molybdenum matrix. Moreover, a quantitative strengthening model correlating dislocation density, oxide volume fraction and size, and molybdenum grain size is established.
Key words: molybdenum alloy; Al2O3; ZrO2; La2O3; strength-elongation product; strengthening model
