Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 27, Issue 1, Pages 173-176Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2008.06.007
Keywords
Molybdenum alloy wire; Lanthanum oxide particle; Strengthening mechanism
Funding
- National High Technology Research and Development Program of China [2008AA031001]
- National Basic Research Program of China [2004CB619303]
- Mechanical Behavior of Materials and Jinduicheng Molybdenum Co. Ltd. of China
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Lanthanum oxide doped molybdenum alloy wires with different diameters were prepared by using the powder metallurgy method and press working technology. The strength were experimentally determined and related to the microstructures. The effects of the oxides mass fractions and wires diameter on the microstructures and on the mechanical properties of the molybdenum alloy wires were quantitatively investigated. Results showed that the microstructure of the doped molybdenum alloy wires will be refined with increasing the oxides mass fractions and reducing wire diameter, resulting in the increase in the yield strength. The quantitative relationships between the yield strengths and the volume fraction of lanthanum oxide particles and the subgrain sizes were presented. Calculations show that the lanthanum oxide particles strengthening effect, fine substructural strengthening effect and dislocation strengthening effect are the main strengthening mechanisms of the lanthanum oxide doped molybdenum alloy wires. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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