An investigation on supercooling directional solidification process of Cu-Ni single phase alloy |
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Authors: | Faqin Xie Jinshan Li Hengzhi Fu |
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Institution: | (1) State Key Laboratory of Solidification, Processing Northwestern Protechnical University, 710072 Xi’an, China |
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Abstract: | Supercooling directional solidification (SDS) is put forward by combination of melt supercooling and conventional solidification
by application of supercooling inheritance. On the self-designed SDS equipment, SDS of Cu-Ni alloy was achieved successfully.
The results are as follows: (i) The primary arm spacing is about 30 μm, the growth of secondary arms are strongly suppressed.
The primary arm spacing is nearly the same as LMC method (GL=25 K/mm, V=500 μm/s), the primary stems are straight, fine and completed, with an inclination angle of about 5.8°. (ii) A
semi-quantitative T-T model is brought forward to describe the dendrite growth rateV vs. undercoolingΔT. The prediction of T-T model agrees well with experimental results. The formation of fine equiaxed dendrites, transition region
and dendrite region can be explained successfully byΔT-V-x relation of T-T model. |
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Keywords: | alloy melt supercooling directional solidification supercooling directional solidification |
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