Molybdenum Wire Doped with Lanthanum Oxide
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- Category: Molybdenum knowledge
- Published on 06 August 2013
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Recrystallization mechanism of La_2O_3-doped molybdenum wire was investigated. Samples of 1 mm in diameter were annealed for 1 h at various temperatures.
Substructures were observed by transmission electron microscopy. Subgrain structures including d%islocations of high density and small particles were stable up to about 1650 deg C.
Upon annealing at 1800 deg C large grains with high aspect ratio along the working direction partly developed, though subgrains composed of dislocations simultaneously remained.
Additionally, dislocations in the coarsened grain were not perfectly removed due to the pinning effect of second particles.
Upon annealing over 2000 deg C, on the other hand, elongated grain structures developed in the whole area. It is concluded that the grain coarsening was attributed to the primary recrystallization (subgrain coalescence) .
Involving a rearrangement of dislocations rather than to the secondary recrystallization involving a nucleation process in primary grains.
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