亚快速凝固结晶取向对结晶形态选择的影响
Influence of the Crystalline Growth Orientation on the Microstructure in Hyporapid Solidification
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摘要: 采用区域熔化定向凝固装置,对冷却速度在13~130K/s范围内Ni-5%Cu合金的结晶形貌研究表明:在温度梯度1300K/cm条件下,晶体生长速度v=500μm/s时,不同结晶取向晶粒的结晶形貌不同;当晶体生长速度v=800μm/s时,不同结晶取向晶粒的细胞晶间距不同,亚快速凝固条件下,晶体生长方向对结晶形貌的影响非常显著.Abstract: The solidified microstructure of Ni-5% Cu alloy is researched at the cooling rate range of 13~130K/s with zone melting unidirectional solidification apparatus.It indicates that the crystals with different crystalline growth orientation have different solidified microstructures on the condition of GL-1300 K/cm,v=500μm/s.The crystals have different superfine cellular spacing due to the crystalline growth orientation with GL=1300 K/cm,v=800μm/s.The crystalline orientation has a great effect on the solidified microstructure in hyporapid solidification.
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