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3.142.174.8
3.142.174.8
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SCIE SCOPUS
Ni - Aluminide 금속간화합물에서 Fe 첨가가 미세조직과 기계적 특성에 미치는 영향
Effect of Fe addition on the Microstructure and Mechanical Properties of Ni - Aluminide Intermetallics
최병학(B . H . Choe), 이종훈(J . H . Lee), 김학민(H . M . Kim)
UCI I410-ECN-0102-2008-580-001843935

The effect of Fe addition on Ni-Aluminide intermatallics was studied in order to improve the mechanical properties, especially the room temperture ductility and the high temperature strength. It was found that the Fe addition in the two phase alloy of (NiAl+Ni₃Al) gives significant improvement in the room temperature ductility. The high ductility of Ni-Al-Fe alloy at room temperature seems to be caused by the mobile dislocations formed at NiAl which occurred by the accumulated dislocations in Ni₃ Al. The strength improvement, especially at high temperature, was tried by micro-alloying and hot forming. When the micro-alloying of B, Cr, Ti and Zr was tried the optimum condition in strength and elongation was obtained from the addition of 1 at % Ti in Ni-20Al-27.5Fe. When the alloy is hot-formed, the Zr addition gives significant improvement in the high temperature strength, that is to say, the maximum strength at high temperature range was obtained from the hot extruded bars of Ni-20Al-27.5Fe-1Ti-0.5Zr. It is believed that the microstructure is consisted of fine grains and precipitates by the hot extrusion, which is accentuated by the Zr compounds.

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