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Vol.38, No.11, 1421 ~ 1426, 2000

Title

Characteristics of the Intermetallic Compound Co3AlCx ( k - phase ) in Co-Al-C System Part 1 : Mechanical Property of ( Co ) + k Two Phase Alloys

황금연Keum Yeon Hwang , 강창석Chang Sug Kang , 명태호Tai Ho Myeong , 최답천Dap Chun Choi , Yoshinao Mishima

Abstract

A new class of Co-base superalloy may be developed based on the ternary Co-Al-C system in which two phase alloys could be designed containing E2₁-type intermetallic compound Co₃AlC_x, known as κ-phase, being dispersed in the Co primary solid solution. Strength and ductility of the two phase alloys are evaluated at room to elevated temperatures. It is found that compressive 0.2% flow stress of the two phase alloys at room temperature seems to exhibit a maximum with 30 to 50% volume fraction of the intermetallic phase. Room temperature ductility of the two phase alloys is found to be 5 to 21% varying monotonously with increasing volume fraction of the intermetallic phase. At 1000℃, the 0.2% flow stress of the two phase alloys with κ-phase for more than 30% in volume are about 250 to 280 ㎫ under a strain rate of 1.4 ×10^(-4)s^(-1), which is comparable to that of commercial nickel base superalloy.

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