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A STUDY OF CARBIDE GROWTH IN MAR-M247 LC ALLOY BY DIRECTIONAL SOLIDIFICATION METHOD

J.H Lee , J. Chen , S.J. Choe , Y.T. Lee and H.M. Kim(High Temperature Materials Laboratory , Korea Institute of Machinery & Materials , 66 Sangnam Dong , Changwon , Kyungnam , 641010 , Korea Manuscript received 26 August 1996)

金属学报(英文版)

The carbide growth behavior of MAR-M247 LC alloy was investigated by directional solidification and quench method. The carbide volume fraction, trapping and growth behavior were correlated with the growth rate.It was found that the carbide volume fraction decreased at slower growth rate.This decreasing was caused by lower solidliquid interface trapping ability at slower growth rate.

关键词: :carbide , null , null , null

Effects of Additional Elements on Microstructure and Precipitation Behaviour in Rapidly Solidified Al-Ti Base Alloys

Won-Wook Park , Chul-Jin Choi and Bong-Sun You (Dept. of Materials Processing , Korea Institute of Machinery and Metals , 66 Sangnam-Dong , Changwon , Kyungnam , Korea 641-010)(To whom correspondence should be addressed)

材料科学技术（英）

Rapidly solidified Al-Ti base alloys were prepared by melt spinning at the cooling rate about 107 K/s. The melt-spun ribbons were used to observe the dricrostructures after heat treatment.In the supersaturated Al-Tl-Si alloy, age hardening occurred after 1 h anneal in the temperature range of 4000~500℃, which seems to be attributed to the precipitation of metastable Ll2- (Al,Si)3Ti phase. However. the microhardness was relatively low because of the low v/o and the insufflcient stability of precipitates. Thus. Cr was added to Al-Ti-Si alloys in order to stabilize the microstructures and to increase the v/o of precipitate5. As a result. the alIoys containing Cr were evaluated to possess the improved properties at the service temperature.

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