Research of the Transition from Dendrite to Superfine Cell in Hyporapid Solidification
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摘要: 采用區域熔化定向凝固技術,研究了冷速在26~130K/s范圍內Ni-5%Cu合金的組織轉變過程。試驗結果表明:在溫度梯度1300K/cm情況下,生長速度在500~700μm/s區間上,結晶形貌發生枝胞轉變。溫度梯度對亞快速凝固組織影響很大。晶體生長方向影響結晶形態選擇。Abstract: The microstructure transition process of Ni-5%Cu alloy is researched in therange of 2.6-130K/S cooling rate with zone melting unidirectional solidification technique. It is indicated that the solidified morphology transits from dendrite to superfine cell within the limitids of the crystal growth velocity 500~700μm/s. The temperature gradient has a great effect on the microstructure in hyporapid solidification. The crystal growth orientation is an important factor to the selection on the solidified microstructure.
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