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通过试验观察了掺碲6×10~(16)cm~3与不掺碲的InSb-NiSb共晶复合材料在温度梯度G=125±5℃/cm和不同凝固速度(R=0.041～1.0mm/min)的显微组织。结果表明锭棒中间的大部分区域没有出现单相和稀疏二相生长带缺陷组织(机动下降速度很慢时例外)。经过测定,NiSb纤维间距(λ)和单向凝固速度(R)的关系符合Tiller-Jackson的关系式,即: G=125±5℃/cm,未掺碲的共晶:λ~2R=0.76×10~(-10)cm~3/s; G=125±5℃/cm,掺碲6×10~(16)/cm~3共晶:λ~2R=0.99×10~(-10)cm~3/s。 它们比G=35℃/cm,未掺碲共晶的λ~2R=1.56×10~(-10)cm~3/s小。
The effects of temperature gradient (G = 125 ± 5 ℃ / cm) and different solidification rates (R = 0.041 ~ 1.0mm) were observed by experiments on the InSb-NiSb eutectic composites doped with tellurium 6 × 10 ~ (16) cm ~ / min) of the microstructure. The results show that most of the ingot intermediate region does not appear single-phase and sparse two-phase growth zone defect organization (except when the motor speed is slow). The relationship between the NiSb fiber spacing (λ) and the unidirectional solidification rate (R) is in accordance with the Tiller-Jackson relation: G = 125 ± 5 ° C / cm and eutectic without tellurium: λ ~ 2R = 0.76 × 10 ~ (-10) cm ~ 3 / s; G = 125 ± 5 ℃ / cm, doped tellurium 6 × 10-16 / cm ~ 3 / s. They are smaller than G = 35 ℃ / cm and λ ~ 2R = 1.56 × 10 ~ (-10) cm ~ 3 / s.