液态金属深过冷快速凝固过程中初生固相的重熔

doi:10.11900/0412.1961.2017.00537

金属学报

2018, Vol. 54

Issue (5): 627-636 DOI: 10.11900/0412.1961.2017.00537

金属材料的凝固专刊

本期目录 | 过刊浏览

液态金属深过冷快速凝固过程中初生固相的重熔

李金富^1,²(

), 周尧和¹

1上海交通大学材料科学与工程学院金属基复合材料国家重点实验室上海 200240
2上海交通大学材料科学与工程学院上海市激光制造与材料改性重点实验室上海 200240

Remelting of Primary Solid in Rapid Solidification of Deeply Undercooled Alloy Melts

Jinfu LI^1,²(

), Yaohe ZHOU¹

1 State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2 Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

引用本文:

李金富, 周尧和. 液态金属深过冷快速凝固过程中初生固相的重熔[J]. 金属学报, 2018, 54(5): 627-636.
Jinfu LI, Yaohe ZHOU. Remelting of Primary Solid in Rapid Solidification of Deeply Undercooled Alloy Melts[J]. Acta Metall Sin, 2018, 54(5): 627-636.

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摘要:

深过冷液态金属(合金)凝固时伴随有显著的温度再辉,初生固相因此不可避免地部分被重熔,从而影响到最终凝固组织形态。近年来,过冷熔体中晶体生长理论模型不断完善,使得定量分析初生固相重熔程度随过冷度的变化规律成为可能,本文即对这方面的研究工作进展进行综述,并结合某些合金在不同过冷度下晶体生长行为及其凝固组织的实验结果,对典型非平衡凝固组织的形成机制进行阐述。

关键词 ：深过冷, 快速凝固, 固相重熔, 微观组织

Abstract：

Solidification of deeply undercooled alloy melts proceeds with obvious temperature recalescence, during which part of primary solid is inevitably remelted, and the microstructural morphology is inevitably changed. During past decades, great improvement was achieved in modelling crystal growth in undercooled alloy melts, making it possible to quantitatively evaluate the remelting degree of primary solid at different undercoolings. In this paper, the progress in modelling the remelting of primary solid was introduced, and the variation of remelted fraction of primary solid as a function of the alloy feature and undercooling was presented. In combination with experimental results of crystal growth pattern and solidification structure in selected alloys, the mechanisms for grain refinement in undercooled single-phase alloys and anomalous eutectic formation in undercooled eutectic alloys were then discussed.

Key words： deep undercooling rapid solidification solid remelting microstructure

收稿日期: 2017-12-14

ZTFLH:

TG111

基金资助:资助项目国家自然科学基金项目Nos.51771116和51620105012

作者简介:

作者简介李金富,男,1964年生,教授

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00537 或 https://www.ams.org.cn/CN/Y2018/V54/I5/627

图1 过冷熔体中分枝尖端沿轴向的温度分布与液相过冷度组成示意图[14]

图2 Ni75Cu25合金凝固时初生固相重熔分数和过冷度的关系[9]

图3 不同液相线斜率、平衡溶质分配系数和成分的共晶合金,共晶两相耦合生长时初生共晶重熔分数随过冷度的变化[14]

图4 Ni-18.7%Sn (原子分数)共晶合金深过冷快速凝固过程中初生相的重熔分数[30]

图5 Ni75Cu25合金晶粒度随过冷度的变化[9]

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