Undercooled liquid state properties and intermetallic compounds growth of ternary Fe-Tb-B alloy

IF 4.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Y. Ma , Y.P. Zheng , L. Hu , S.H. Liu , W. Zhai
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引用次数: 0

Abstract

The substantial undercooling up to 217 K (0.15 times of the alloy liquidus temperature TL) and rapid solidification of ternary Fe70Tb18B12 alloy were achieved through electromagnetic levitation technique. The undercooled liquid surface tension, viscosity and diffusivity were measured versus temperature, from which the activation energies for viscous flow and atomic diffusion were deduced. As undercooling rose, the primary τ1 (Tb2Fe14B) intermetallic compound transformed from faceted coarse dendrites to nonfaceted equiaxed grains, attributed to the reduced anisotropic growth velocity between low-index (004) and high-index (214) crystal planes. The dendrite growth velocity of primary τ1 phase increased as a double-exponential function with its volume fraction up to 47 %. The peri-eutectic structures at small undercoolings showed a regular morphology featured by τ2 (TbFe4B4) phase distributing in the interdendritic region of TbFe2 phase, and their semi-coherent interface following orientation relationship of τ2[101]//TbFe2[011] and τ2 (111)//TbFe2(100). If undercooling increased, the peri-eutectic τ2 phase grew as small granules uniformly dispersing on TbFe2 phase matrix while the interface relationship converted to τ2[111]//TbFe2[012] and τ2 (112)//TbFe2 (121). The corrosion current density of rapid solidification microstructures decreased by two orders of magnitude at the maximum undercooling, which was ascribed to the combination of increased volume fraction, the refinement effect of primary τ1 intermetallic compound and the formation of irregular peri-eutectic (τ2+TbFe2) structures.
三元Fe-Tb-B合金的过冷液相性能及金属间化合物生长
采用电磁悬浮技术,实现了Fe70Tb18B12三元合金在217 K(合金液相温度TL的0.15倍)大量过冷和快速凝固。测量了过冷液体的表面张力、粘度和扩散率随温度的变化,并由此推导出粘性流动和原子扩散的活化能。随着过冷度的升高,初级τ1 (Tb2Fe14B)金属间化合物由多面粗枝晶转变为无多面等轴晶,这是由于低指数(004)和高指数(214)晶面间各向异性生长速度的降低。初生τ1相的枝晶生长速度呈双指数函数增长,其体积分数高达47%。小过冷时的近共晶结构表现为τ2 (TbFe4B4)相分布在TbFe2相的枝晶间区域,其半相干界面遵循τ2[101]//TbFe2[011]和τ2 (111)//TbFe2(100)的取向关系。如果过冷增加,近共晶τ2相成长为小颗粒均匀地分散在TbFe2相基体上,而界面关系转化为τ2[111]//TbFe2[012]和τ2 (11 - 2)//TbFe2(121)。在最大过冷时,快速凝固组织的腐蚀电流密度下降了2个数量级,这是由于体积分数的增加、初级τ1金属间化合物的细化作用和不规则的近共晶(τ2+TbFe2)组织的形成共同作用的结果。
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来源期刊
Intermetallics
Intermetallics 工程技术-材料科学:综合
CiteScore
7.80
自引率
9.10%
发文量
291
审稿时长
37 days
期刊介绍: This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.
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