일방향응고된 NiAl/$Ni_3Al$ 2상합금의 방향성 측정 및 기계적 특성 평가

이혜정; 박노진; 최환; 이재현; 오명훈

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자료유형: 학술저널

저자정보: 이혜정 (금오공과대학교 신소재시스템공학부) 박노진 (금오공과대학교 신소재시스템공학부) 최환 (금오공과대학교 기계공학부) 이재현 (창원대학교 금속재료공학과) 오명훈 (금오공과대학교 신소재시스템공학부)

저널정보: 한국열처리공학회 열처리공학회지 열처리공학회지 제23권 제2호

발행연도: 2010.1

수록면: 96 - 103 (8page)

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$Ni_3Al$ is known as a good high temperature structural material because of high yield strength at ambient temperature. However, it is too brittle to use as a structural material because of their weak grain boundary. In this work, orientation measurement and related mechanical properties of directionally solidified NiAl/$Ni_3Al$ two-phase alloys with various compositions (Ni-23~27 at.%Al) were investigated for developing multi-phase DS-processed alloys with the growth rates of 10, 50 and 100 ${\mu}m/s$ in a modified Bridgeman type furnace. It was found that the multi-phase microstructures such as the $\gamma$ dendrite +${\gamma}'$ matrix duplex microstructure was formed in the hypoeutectic composition of 23 at.%Al, $\beta$ dendrite +${\gamma}'$ matrix duplex microstructure in the hypereutectic composition of 26 and 27 at.%Al. And ${\gamma}'$ single phase was formed in the composition of 24.5 and 25 at.%Al. The hypoeutectic alloy including $\gamma$ dendrites with ${\gamma}'$ matrix showed a large elongation of over 70% at room temperature. However, the room-temperature tensile elongation decreased with increasing Al contents because the volume fraction of brittle $\beta$ dendrites in the ductile ${\gamma}'$ matrix increased.

#$Ni_3Al$ #NiAl #Intermetallic Compound #Directional Solidification #Mechanical Properties

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