Materials Transactions Online

Transactions of the Japan Institute of Metals, Vol. 7 No. 1 (1966) pp.59-66
© 1966 The Japan Institute of Metals

Th-ThC Phase Diagram

Sakae Takeuchi, Toshio Honma,
Tsuneo Satow and Toshio Hirai

The partial phase diagram in the Th-C system between pure Th and ThC was studied by metallographic and X-ray techniques and by measurements of electrical resistivity in quenched and slow cooled Th-C alloys. The peritectic point of the reaction, liq.+ThC\rightleftarrowsα-Th, was found at 16 at%C and about 1875°C and the peritectic composition of ThC was 33 at%C. The eutectic reaction occurred at 1650°C and its composition of α-Th and β-Th was 6.5 and <0.5 at%C, respectively. The α\rightleftarrowsβ transformation temperature rose gradually with the carbon content up to 2.3 at%C and rose rapidly between the compositions of 2.3 and 3.7 at%C. The phase boundaries of α/ThC+α, ThC+α/ThC, ThC/ThC+ThC2 and liq.+ThC/ThC were also established.

(Received Septembr 29, 1965)

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