(1、西北工業(yè)大學(xué)凝固技術(shù)國家重點實驗室，西安 71007
2、上海工業(yè)大學(xué)；
3、廈門林德叉車總廠)
摘 要: 利用新型高溫梯度(GL =256～1 300 K /cm)定向凝固裝置，研究了籽晶法制備含細亞結(jié)構(gòu)的鎳基高溫合金DD3單晶及二元模型合金Al-0.85%Cu晶體生長過程的組織演化與選擇特征中的非穩(wěn)態(tài)組織特性，特別是定向胞狀振蕩性微觀結(jié)構(gòu)的組織特征及其與定向凝固工藝條件的關(guān)系，并將其與在晶體生長透明有機物模擬裝置-Jackson溫度平臺(GL可達 150 K/cm)上原位觀察到的CBr4定向生長結(jié)果相對比，從而分析其形成機制， 探索有效控制和利用該現(xiàn)象的工藝途徑。
關(guān)鍵字: 鎳基高溫合金單晶 高溫度梯度定向凝固 亞微觀結(jié)構(gòu)振蕩
（1.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 ;
2.Shanghai Technical University
3.Xiamen Linde Fork-lift Truck Factory）
Abstract:Non-steady state microstructure selection and evolution in crystal growth of Ni-base DD3 single crystal superalloy and Al-0.85%Cu, with "seeding" technique and new directional solidification(DS) technique and equipment(GL=256～1 300 K/cm), was investigated comparing with that of organic simulation material of CBr4 with special Jackson type temperature platue . Feature and relationship with process condition oscillation celluar sub-microstructure in different materials at different cooling rates were experimentally observed and analysed.
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