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Vol.35, No.11, 1499 ~ 1506, 1997
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| Title |
| Effects of the Addition of Ti and Zr on the Microstructure and the Mechanical Properties of Ni-Al-Fe Intermetallics |
| 최병학 , 김일호 , 최재호 , 이종훈 , 김학민 B . H . Choe , I . H . Kim , J . H . Choi , J . H . Lee , H . M . Kim |
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| Abstract |
| The effect of Ti, Zr and Mo addition on a Ni aluminide intermetallic, Ni-20Al-27.5Fe was studied to improve the mechanical properties, especially the room temperature ductility and the high temperature strength. It was found that the Fe addition in the two phase alloy of NiAl and Ni₃Al gives significant improvement in the room temperature ductility. The hot forming and the microalloying of Ti, Zr and Mo were tried to get optimum condition of the mechanical properties of strength and ductility. The maximum strength at high temperature range was obtained from a hot extruded alloy. It is believed that the tensile properties of Ni-Al-Fe-Ti-Zr should be improved by the controlled microstructure formed by the alloying of Ti and Zr, and the hot forming. The microstructure is consisted of fine grains and precipitates of NiAl and Ni₃Al, which seems to be given by the effect of the hot extrusion related to the Zr compounds in the boundaries of NiAl and Ni₃Al. The phase of boundary precipitates formed by the accumulation of Zr were analysed by XRD and electron microscopes. |
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