Titanium 첨가에 의한 NiAI / NiAI 2 상 합금의 미세조직제어 Microstructure Control of NiAl / Ni3AI Two - Phase Alloy by Addition of Titanium

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In the previous study, the β+γ` alloy containing Ti and C showed a more refined mesh microstructure than the lamellar microstructure. This study revealed that the titanium among alloying elements helped to refine the microstructure. The M_s temperature of NiAl lowered rapidly with an increasing titanium content. This effect therefore contributed to the formation of the fine microsturucture. In the case of a low titanium content(below 2.2at.%), the M_s temperature was above ∼255℃, and when the martensite was heated, the exothermic β`→Ni_5Al₃ transformation appeared first. Because the martensite twins could be inherited during the β`→Ni_5Al₃ transformation, the lamellar β+γ` structure similar to martensite plates was finally formed. However, in the case of a high titanium content, the M_s temperature sufficiently lowered, so the endothermic β`→β transformation could occur before the β`→Ni_5Al₃ transformation. The endothermic transformation extinguished the martensite plates, therefore allowing the mesh microstructure to be independently formed from the martensite plates.
Publisher
대한금속재료학회
Issue Date
2001-01
Language
Korean
Citation

대한금속·재료학회지, v.39, no.7, pp.731 - 737

ISSN
1738-8228
URI
http://hdl.handle.net/10203/84427
Appears in Collection
MS-Journal Papers(저널논문)
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