The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing
The Role of Electric Current-Associated Free Energy and Forced Convection on Grain Refinement in Pure Aluminum under Electropulsing
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电流相关自由能和强制对流对电脉冲下纯铝晶粒细化的作用
DOI：
10.3390/ma12233846
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发表时间：
2019-11
期刊：
影响因子：
3.4
通讯作者：
Xing Hui
中科院分区：
文献类型：
--
作者：
Li Ning;Zhang Limin;Zhang Rong;Yin Pengfei;Wu Hongjing;Song Kaikai;Xing Hui
本文报道了交流脉冲电流对纯铝晶粒细化作用的实验研究。通过对不同温度下的模具预热和金属丝网预埋的宏观组织观察，发现与晶核位置相关的电流自由能（ΔGem）的变化和强制对流控制了细小等轴晶（FEG）的生成。在480 A的脉冲电流作用下，ΔGem诱导晶核从电极与熔体的上界面解离，导致FEG的产生。当电流强度较大时，FEG的产生主要是由于ΔGem和强迫对流导致的上界面附近侧壁上晶核的解离.此外，提出了耦合强制对流引起的晶核解离和枝晶破碎以及ΔGem引起的晶核解离的模型，解释了脉冲电流作用下纯铝中FEG的形成机理.
An experimental study with respect to the effect of an alternating electropulsing on grain refinement in pure aluminum was reported. The macrostructural observation with the mold preheated to different temperature and embedded the metal mesh indicated that the change of electric current-associated free energy related with the position of crystal nuclei (ΔGem) and forced convection dominated the generation of fine equiaxed grains (FEG). Under electropulsing with 480 A, ΔGem induced the dissociation of crystal nuclei from the upper interface of the electrode and the melt, leading to the generation of FEG. For a larger current intensity, FEG originated from the dissociation of crystal nuclei on the side wall besides the upper interface due to ΔGem and the forced convection. Furthermore, the model coupling the dissociation of crystal nuclei and dendrite fragmentation due to the forced convection and the dissociation of crystal nuclei due to ΔGem was presented to explain the formation mechanism of FEG in pure aluminum under electropulsing.
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DOI：
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发表时间：
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期刊：
Metallurgical and Materials Transactions A
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