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phase selection and Microhardness of Directionally Solidified AlCoCrFeNi_(2.1) Eutectic High-Entropy Alloy

Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1281-1290页

作者： Peng Peng Shengyuan Li Weiqi Chen Yuanli Xu Xudong Zhang Zhikun Ma Jiatai Wang School of Materials Science and Energy Lanzhou UniversityLanzhou 730000China Gansu Institute of Metrology Lanzhou 730071China School of Physics and Electronic Information Engineering Qinghai Normal UniversityXining 810000China

In the present work,the solidification behaviors and microhardness of directionally solidified AlCoCrFeNi_(2.1) eutectic highentropy alloy(EHEA)obtained at different growth velocities are *** microstructure of the as-cast AlCoCrFeNi_(2.1) EHEA is composed of bulky dendrites(NiAl phase)and lamellar eutectic structures,indicating that the actual composition of the alloy slightly deviates from the eutectic ***,it is interesting to observe that the full lamellar structure of this alloy is obtained through directional *** order to explain this phenomenon,the maximum interface temperature criterion and the interface response function(IRF)theory are applied to calculate the velocity range of the transition from the primary phase to the eutectic,which is 1.2–2×10^(4)μm/***,microhardness is one of the important parameters to measure the mechanical properties of ***,the microhardness test is performed,and the test result indicates that the microhardness(HV)increased with increasing growth velocity(V)or decreased with increasing lamellar spacing(λ).The dependences ofλand HV on V are determined by using a linear regression *** relationships between theλ,V and HV are given as:λ=11.62V^(-0.48),HV=305.5V 0.02 and HV=328.1λ^(0.04),*** microhardness of the AlCoCrFeNi_(2.1) EHEA increases from 312.38 HV to 329.54 HV with the increase in growth velocity(5–200μm/s).Thus,directional solidification is an effective method to improve the mechanical properties of alloys.

关键词： Directional solidification Eutectic high-entropy alloy phase selection Microstructure Microhardness

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phase selection and solidification path transition of Ti-48Al-xNb alloys with different cooling rates

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Rare Metals 2023年第1期42卷 288-295页

作者： Tan He Rui Hu Jie-Ren Yang Heng-Zhi Fu The State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China

Ti-48Al-xNb alloys were solidified by containerless electromagnetic levitation with quenching system of the conical copper *** influence of cooling rates on phase selection of T1-48Al-xNb alloys was *** near-equilibrium solidification condition,the dendrite βphase is observed as the leading *** other metastable phase(e.g.,α phase) is *** contrast,in rapid solidification condition,the metastable α phase is observed in as-quenched Ti-48Al-2Nb ***,the metastable α phase is replaced by the primary β phase with Nb addition *** Ti-48Al-(x=4,6,8)Nb alloys,increasing cooling rate results in a solidification path *** peritectic reaction(L+β→α) is therefore significantly *** relationships between primary dendrite arm spacing(λ_(1)) and cooling rate(τ) can be described.

关键词： TiAl alloy Cooling rate Microstructure phase selection

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phase selection and Microstructure Evolution Dependance on Composition for Zr-Fe Eutectic Alloys

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Acta Metallurgica Sinica(English Letters) 2024年第10期37卷 1689-1702页

作者： Dong-Dong Zuo Jian Chang Hai-Peng Wang School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an710072China

The knowledge of the phase selection and microstructure evolution of Zr-Fe eutectic alloys is still poorly *** presumed eutectic alloy with a nominal composition of Zr76.0Fe24.0 was discovered to contain a significant proportion ofα-Zr ***,phase selection and microstructure evolution dependance on composition for Zr-Fe eutectic alloys was experimentally determined by using differential scanning calorimetry(DSC)and meticulous electron *** alloys,spanning the composition range of 73.5-74.7%Zr,were examined to investigate microstructure evolution and non-isothermal crystallization *** indicate that in alloys ranging from Zr_(73.5)Fe_(26.5) to Zr_(73.9)Fe_(26.1),the primary FeZr_(2) phase demonstrates preferential growth,followed by eutectic microstructure formation during liquid alloy *** volume fraction of FeZr_(2) dendrites decreases as the Zr content ***,in alloys ranging from Zr_(74.0)Fe_(26.0) to Zr_(74.7)Fe_(25.3),primaryβ-Zr dendrites preferentially grow,followed by a eutectic reaction in the remaining liquid *** content ofα-Zr dendrites reduces with decreasing Zr *** mentioned above,a critical composition range for phase selection is defined as Zr_(x)Fe100.0−x(73.9

关键词： phase selection Thermal analysis Microstructure evolution Crystallization kinetic

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phase selection and microstructure evolution within eutectic Ti-Si alloy solidified at containerless state

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Science China(Technological Sciences) 2022年第7期65卷 1587-1598页

作者： LUO ZhiCong CHANG Jian WANG HaiPeng School of Physical Science and Technology Northwestern Polytechnical UniversityXi'an 710072China

phase selection and microstructure evolution of the undercooled eutectic Ti-Si alloy were systematically investigated by the electromagnetic levitation method, and the maximum undercooling achieved was 318 K(0.2 TE). The migration of the liquidsolid interface was in-situ detected by a high-speed camera system. When the undercooling is smaller than 140 K, the liquid-solid interface is smooth. Once the undercooling arrives at 230 K, the liquid-solid interface is irregular, which reflects the growth transition from the solute control to the combined controls of solute and thermal. The eutectic growth velocity increases as an exponential function of undercooling. The electromagnetic stirring effect makes it difficult to increase undercooling, but plays an important role in accelerating the eutectic reaction velocity at low and moderate undercoolings. Primary dendritic β-Ti phase appears in the solidified alloy from 63 to 176 K undercoolings, and the microstructure is completely composed of eutectic once the undercoolings increase up to 230 K. When the undercoolings exceed 273 K, the microstructure consists of uniformly distributed irregular eutectic. For the drop tube experiments, the microstructures composed of a large amount of dendritic α-Ti phase and eutectic phase are found in a wide range of diameters from 69 to 725 μm. As the decrease of diameter, the solubility of Si in the dendritic α-Ti phase dramatically increases from 6.80% to 10.73%, and the ratio of the area occupied by the dendritic α-Ti on a cross-section of solidified alloy obviously increases from 23.52% to 41.02%, which result from the combined effects of high undercooling and large cooling rate.

关键词： phase selection microstructure evolution high undercooling containerless large cooling rate

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Effect of External Electric Field on phase selection and Stability of Amorphous(Nd_(0.1)Fe_(0.9))_3B Alloy

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Journal of Rare Earths 2004年第6期22卷 799-802页

作者：李山东唐建成袁钻如顾本喜都有为 Depantment of Physics Fujian Normal University Fuzhou 350007 China National Laboratory of Solid State Microstructure Department of Physics Nanjing University Nanjing 210093 China Center for Materials Analysis Nanjing University Nanjing 210093 China Depantment of Physics Fujian Normal University Fuzhou 350007 China

The effect of an external electric field on the crystallization behavior of amorphous (Nd0.1Fe0.9)(3) B alloy was investigated. The crystallization product of Nd2Fe23B3 phase was obtained for this amorphous alloy annealed at 923 K for 300 s in the presence of an external electric field of 300 kV .m(-1) (50 Hz); while the crystallization products are Nd1.1Fe4B4, alpha-Fe, and Fe3B phases under the same annealing condition except for free-electric field. On the other hand, the samples were annealed at 1023 K, which is higher than the decomposition temperature of metastable Nd2Fe23B3 phase, for 600 s. In the case of the presence of an external electric field, the metastable Nd2Fe23 B-3 phase, as a main phase, is still stayed in the sample. This fact suggests that the external electric field enhances the stabilization of the metastable Nd2Fe23B3 phase. The effect of the external electric field on the phase selection and stabilization was explained in terms of the specific conductance difference between the crystallization products.

关键词： electric field phase selection magnetic material rare earths

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Analysis on phase selection and microstructure evolution in directionally solidified Zn-Al-Mg-Ce alloy

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China Foundry 2023年第4期20卷 347-355页

作者： Ji-peng Li De-gao Qiao Shi-wen Dong Peng Peng Xian-tao Yan Xu-dong Zhang Gansu Jiu Steel Group Hongxing Iron and Steel Co. Ltd.Jiayuguan 735199GansuChina School of Materials and Energy Lanzhou UniversityLanzhou 730000China School of Physics and Electronic Information Engineering Qinghai Normal UniversityXining 810016QinghaiChina

In the process of hot-dip Zn-Al-Mg alloy coating,the plating solution dissipates heat in the direction perpendicular to the steel plate,which is considered to be a process of directional *** understand the relationship between microstructure and cooling rate of Zn-Al-Mg alloys,both the phase constitution and microstructure characteristic length scales of Zn-9.5Al-3Mg-0.01Ce(wt.%)alloy were investigated by the directional solidification experiments at different growth velocities(V=40,80,160,250μm·s^(-1)).The experimental results show that the microstructure of directionally solidified Zn-9.5Al-3Mg-0.01Ce alloy is composed of primary Al dendrites and(Zn-Al-Mg2Zn11)ternary eutectics at the growth velocities ranging from 40 to 250μm·s^(-1).The primary Al dendrites are aligned regularly along the growth direction,accompanied with obvious secondary *** relationship between the microstructure length scale and the thermal parameters of solidification is obtained:λ1=374.66V-0.383,andλ2=167.5V-0.563(λ1is the primary dendrite arm spacing,andλ2 is the secondary dendrit arm spacing).In addition,through the interface response function(IRF)and the nucleation and constitutional undercooling(NCU),the phase selection of Zn-9.5Al-3Mg-0.01Ce is obtained:(Zn+Al+Mg2Zn11)ternary eutectics in the Zn-9.5Al-3Mg-0.01Ce alloy will be replaced by ternary eutectics(Zn+Al+MgZn2)when the growth rate is lower than 7.53μm·s^(-1).

关键词： Zn-Al-Mg alloy directional solidification microstructure length scale phase selection

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Tungsten-containing high-entropy alloys: a focused review of manufacturing routes, phase selection, mechanical properties, and irradiation resistance properties

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Tungsten 2021年第2期3卷 181-196页

作者： Tian-Xin Li Jun-Wei Miao En-Yu Guo He Huang Jun Wang Yi-Ping Lu Tong-Min Wang Zhi-Qiang Cao Ting-Ju Li Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China State Key Laboratory of Solidifi cation Processing Northwestern Polytechnical UniversityXi’an 710072China High Entropy Alloy Materials Engineering Research Center(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

Alloying is one of the most effective means to confer superior properties to metal *** far too long,conventional W-based alloys were generally improved by the addition of minor *** exploitation of conventional W-based alloy is restricted to the corner of multielement phase diagrams with tiny compositional ***-entropy alloys(HEAs)are a novel kind of alloys consisting of multi-principal alloying elements(usually more than 4)and have attracted increasing attention,since they were first reported in *** emergence of HEAs filled the gap of the unexplored central region of multielement phase *** them,tungsten-containing HEAs(TCHEAs)exhibit excellent mechanical properties,especially at extraordinarily elevated ***,recent studies showed that TCHEAs had outstanding irradiation resistance *** might serve as a promising candidate for plasma-facing materials in the fusion *** characteristics of TCHEAs are different from other HEAs due to the addition of tungsten with ultrahigh-melting ***,this paper aimed to introduce the manufacturing routes of TCHEAs;review the phase selection,mechanical properties,and irradiation resistance properties of TCHEAs;and propose the future prospects of TCHEAs.

关键词： Tungsten-containing high-entropy alloys Irradiation resistance properties Mechanical properties Manufacturing routes phase selection

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phase selection and microstructure evolution of undercooled Fe-Cu peritectic alloy

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Progress in Natural Science:Materials International 1999年第4期 47-57页

作者：鲁晓宇曹崇德魏炳波 China Department of Applied Physics Northwestern Polytechnical University Xi’an 710072

Fe-Cu pentectic alloy was melted and superheated within a special boronsilicate glass, then under-cooled in argon atmosphere. Undercoolings up to 277 K were attained and the hypercooling limit of the alloy was de termined to be 395 K. The microstructurcs of the alloy were characterized by a supersaturated αFe matrix plus a small amount of Cu phase distributed as tiny particles δFe phase was the actual nucleating phase in the small undercooling regime below 125 K. But γFe phase might be able to nucleate directly from the liquid alloy at still larger undercool ings. Solute trapping effect was found in this alloy system. It was also found that the recalescence temperature de creased and the recalescence rale increased with undercooling. A maximum dendrite growth velocity of 50 m·s was detected experimentally, which corresponded more probably to γFe dendrite growth. Theoretical calculations based on the LKT/BCT dendritic growth model indicate that for δFe phase there is a transition from solute diffus

关键词： undercooling crystal nucleation phase selection dendrite growth peritectic transformation.

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Effect of silicon on phase selection of ternary compounds during solidification of ZA84 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2011年第1期21卷 52-57页

作者：张春香关绍康刘涛李少华刘忠侠郑州大学物理学博士后流动站郑州450001 郑州大学材料科学与工程学院郑州450001 郑州大学研究生院郑州450001

Effect of silicon on the phase selection between τ phase（Mg32（Al,Zn）49） and φ phase（Al2Mg5Zn2） in ZA84（Mg-8Zn-4Al-0.3Mn） magnesium alloy produced by steel mold cast was studied using X-ray diffractometer,scanning electron microscope and differential scanning *** results show that with increasing Si addition in ZA84 alloy,the liquidus temperatures of the alloys and the solidification temperature ranges *** ternary compound in ZA84 alloy is mainly τ phase and a little φ *** adding Si to ZA84 alloy,the preferential precipitation sequence of the ternary compounds changes,φ phase preferentially forms,whereas τ phase is *** solidification kinetics study of phase selection indicates that there is a critical degree of undercooling of the *** the undercooling exceeds the critical degree,τ phase preferentially forms while φ phase is suppressed;otherwise,φ phase preferentially forms while τ phase is suppressed.

关键词： ZA84 alloy silicon phase selection solidification kinetics

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Uniformly Dispersed Carbide Reinforcements in the Medium-Entropy High-Speed Steel Coatings by Wide-Band Laser Cladding

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1145-1150页

作者： Bang Dou Hui Zhang Jia-Hao Zhu Ben-Qi Xu Zi-Yi Zhou Ji-Li Wu Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) Anhui University of TechnologyMa'anshan 243002China School of Materials Science and Engineering Anhui University of TechnologyMa'anshan 243002China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

A medium-entropy high-speed steel(ME-HSS)coating with the 76 at.%of Fe and multiple alloying elements was prepared by the wide-band laser *** with the commercial W6 Mo5 Cr4 V2(M2)HSS coating which contains a large number of network lamellar M2 C-type carbides along the grain boundaries,the presented ME-HSS coating has a high quantity of fi ner and more uniformly dispersed M C-type carbides;on the other hand,the coating has less retained austenite and much lower brittleness as well as similar secondary hardening eff ect and tempering hardness.

关键词： High-speed steel Medium-entropy alloy phase selection Laser cladding

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