亞快速凝固結晶取向對結晶形態選擇的影響

Influence of the Crystalline Growth Orientation on the Microstructure in Hyporapid Solidification

摘要: 采用區域熔化定向凝固裝置,對冷卻速度在13~130K/s范圍內Ni-5%Cu合金的結晶形貌研究表明:在溫度梯度1300K/cm條件下,晶體生長速度v=500μm/s時,不同結晶取向晶粒的結晶形貌不同;當晶體生長速度v=800μm/s時,不同結晶取向晶粒的細胞晶間距不同,亞快速凝固條件下,晶體生長方向對結晶形貌的影響非常顯著.

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 G_L-1300 K/cm,v=500μm/s.The crystals have different superfine cellular spacing due to the crystalline growth orientation with G_L=1300 K/cm,v=800μm/s.The crystalline orientation has a great effect on the solidified microstructure in hyporapid solidification.