一方向凝固したAl-CuAl2,Al-NiAl3およびAl-CO2Al9共晶合金の成長形態について
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Al-CuAl2, Al-NiAl3 and Al-Co2Al9 eutectic alloys were solidified unidirectionally by the thermal-valve technique, and changes of growth morphology with changes of freezing conditions were studied.The results obtained are as follows:(1) Each eutectic alloy showed a transition from planar to colony structures with the occurrence of constitutional supercooling which depended on the freezing conditions and the impurity contents.(2) Growth morphologies of intermetallic compounds in Al-CuAl2, Al-NiAl3 and Al-Co2Al9 eutectics were also changed from degenerate, blade and ribbon type to lamellar, rod and fibre forms respectively with an increase of freezing rate.(3) Linear relationships were obtained between the square root of freezing rate, R1/2 and the reciprocal of interphase spacing, λ-1 or the interface undercooling, ΔT. Applying these relations to Jackson and Hunt's equation, interphase boundary energy, σαβ and diffusion coefficient, D were estimated.(4) Measured values of ultimate tensile strength of these unidirectionally solidified eutectic alloys were not sufficiently high as a composite material.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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