다결정 TiAl + Mo 합금의 인장변형특성 및 층상조직의 제어 Tensile Deformation Behavior and Lamellar Structure Control of Polycrystalline TiAl+Mo Alloy

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The effect of Mo additions on the microstructure and the room temperature deformation behavior of directionally solidified (DS) and polycrystalline forms of two-phase TiAl alloys were systematically investigated. Tensile elongation as large as 6.5% was observed for a polycrystalline specimen with duplex structure, but it varied with the strain rate and the test environments. In case of the fully lamellar structure, however, tensile elongation lover than 1% was obtained both in polycrystalline and in DS specimens. It was found from directional solidification studies that the lamellar boundary orientation in DS ingot has been affected by the growth rate and Mo contents. In case of Ti-48.5at.%Al-0.6at.%Mo DS ingot grown at a growth rate of 300 ㎜/hr, the lamellar boundary was nearly perpendicular to the growth direction. However, the lamellar boundary orientation of Ti-47.5at.%Al-2.5at.%Mo DS ingot was nearly parallel to the growth direction when the directional solidification was performed at a growth rate of 90 ㎜/hr. These results have shown that solidification procedures of TiAl with a nearly stoichiometric composition has been affected by Mo addition and, therefore, the lamellar boundary orientation in DS ingot could be controlled by changing the growth rate and the content of Mo additions.
Publisher
대한금속·재료학회
Issue Date
1997-01
Language
Korean
Citation

대한금속·재료학회지, v.35, no.1, pp.31 - 37

ISSN
1738-8228
URI
http://hdl.handle.net/10203/77661
Appears in Collection
MS-Journal Papers(저널논문)
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