不同热流模式下快速凝固Cu-Co不混溶合金枝晶-分相结构的转变（英文）

发布时间：2018-06-21 04:34

本文选题：快速凝固 + 不混溶合金　；参考：《Transactions of Nonferrous Metals Society of China》2017年01期

【摘要】：综合采用熔融玻璃净化、铜模喷铸及单辊旋淬技术,对比研究不同过冷度、不同冷速作用下Cu-Co不混溶合金的快速凝固行为。通过对凝固发生时的热流方式、形核及生长过程的分析,阐述合金非平衡组织由枝晶到分相结构的转变及其相应尺寸的变化规律。随过冷度增加,不混溶效应的增强导致柱状枝晶向分相结构转变。由于铜模喷铸时发生多点形核,凝固组织呈现为等轴枝晶并随冷速增加而不断细化。当喷铸试棒直径为4 mm时,不混溶效应形成的液滴由于长大不充分最终形成细小粒状分相组织。单辊旋淬薄带由于冷速最高,凝固过程瞬间完成,可有效抑制液相分离的发生,有利于胞状单相固溶体组织的形成。
[Abstract]:The rapid solidification behavior of Cu-Co immiscible alloys with different undercooling and different cooling rates was studied by means of melting glass purification, copper mold spray casting and single roll spinning. Based on the analysis of the heat flux, nucleation and growth process during solidification, the transformation from dendrite to phase separation structure of the alloy and the change of the corresponding size are described. With the increase of undercooling degree, the enhancement of immiscible effect leads to the transformation of columnar dendrite to phase separation structure. Due to the multi-point nucleation, the solidification structure presents equiaxed dendrite and refines with the increase of cooling rate. When the diameter of the spray cast rod is 4 mm, the droplets formed by the immiscible effect will form fine granular phase separation structure due to insufficient growth. Due to the highest cooling rate and the instantaneous completion of the solidification process, the single roll spinning strip can effectively inhibit the occurrence of liquid phase separation and is conducive to the formation of cellular single-phase solid solution structure.
【作者单位】：西北工业大学凝固技术国家重点实验室;南昌航空大学航空制造工程学院;
【基金】：Project(SKLSP201118)supported by the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University,China Projects(51431008,51461032)supported by the National Natural Science Foundation of China Project(51125002)supported by the China National Natural Science Foundation for Distinguished Young Scholars Project(GJJ14504)supported by the Education Department of Jiangxi Province,China
【分类号】：TG146.11

【相似文献】