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glass-forming ability, phase formation and mechanical properties of glass-forming Cu-Hf-Zr alloys

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Progress in Natural Science:Materials International 2019年第5期29卷 576-581页

作者： K.Kosiba Kaikai Song U.Kühn Gang Wang S.Pauly Leibniz IFW Dresden Institute for Complex Materials School of Mechanical Electrical & Information Engineering Shandong University (Weihai) Laboratory for Microstructures Institute of Materials Shanghai University

The influence of Hf additions on the glass-forming ability（GFA）,phase formation and mechanical properties of Cu;Hf;Zr;（x=2,5,10,20 at.%）alloys has been systematically *** report on a distinct correlation between phase formation and GFA of Cu;Zr;-based *** additions of Hf reduce the thermal stability of the high-temperature B2Cu（Hf,Zr）phase,while the thermal stability of the corresponding undercooled melt is *** GFA of these alloy series gradually raises up to 10 at.%Hf,whereas at 20 at.%Hf,the GFA is drastically lowered,since the B2Cu（Hf,Zr）phase becomes unstable and the precipitation of the lowtemperature equilibrium phases is *** interrelation determines the microstructure and results in the formation of Cu-Hf-Zr-based bulk metallic glass *** composites not only show appreciable macroscopic plastic strain,but also high yield strength.

关键词： Metallic glasses glass-forming ability Composites Continuous cooling transformation (CCT) diagram Mechanical properties

glass-forming ability and Chemical Stability of Magneto-optical glass Heavily Doped with Rare Earth Oxide

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Journal of Wuhan University of Technology(Materials Science) 2009年第4期24卷 640-643页

作者：殷海荣章春香 School of Materials Science and Engineering Shaanxi University of Science and Technology

The glass-forming region of B2O3-Al2O3-SiO2 （BAS） glass heavily doped with rare earth oxides was investigated by an effective method, and the chemical stability was investigated by powder method. Influences of rare earth oxides on the glass-forming ability and the chemical stability of the BAS glass were also discussed. The experimental results show that the BAS glass-forming region expands firstly with the increase of the Tb2O3 content up to 30mol% and then shrinks. The acid-resistant capacity of the BAS glass doped with rare earth oxides is the lowest, the water-resistant capacity is secondary, and the alkali-resistant capacity is the best. Besides, the glass chemical stability can be improved by doping appropriate amount of rare earth oxides. Moreover, the stronger the ionic polarization ability of the rare earth ions is, the better the chemical stability of the BAS glass will be.

关键词： magneto-optical glass glass-forming ability chemical stability rare earth oxide

Effects of rare-earth elements on the glass-forming ability and mechanical properties of Cu_(46)Zr_(47-x)Al_7M_x(M = Ce,Pr,Tb,and Gd) bulk metallic glasses

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Rare Metals 2010年第5期29卷 444-450页

作者： XIE Zhiwei ZHANG Yongzhang YANG Yuanzheng CHEN Xianzhao TAO Pingjun Faculty of Material and Energy Guangdong University of Technology Guangzhou 510006 China

Cu46Zr47-xA17Mx （M = Ce, Pr, Tb, and Gd） bulk metallic glassy （BMG） alloys were prepared by copper-mold vacuum suction casting. The effects of rare-earth elements on the glass-forming ability （GFA）, thermal stability, and mechanical properties of Cu46Zr47-xA17Mx were investigated. The GFA of Cu46Zr47-xA17Mx （M = Ce, Pr） alloys is dependent on the content of Ce and Pr, and the optimal content is 4 at.%. Cu46Zr47-xA17Thx（X = 2, 4, and 5） amorphous alloys with a diameter of 5 mm can be prepared. The GFA of Cu46Zr47-xA17Gdx（x = 2, 4, and 5） increases with increasing Gd. Tx and Tp of all decrease. Tg is dependent on the rare-earth element and its content. ATx for most of these alloys decreases except the Cu46Zra2Al7Gd5 alloy. The activation energies △Eg, △Ex, and △Ep for the Cu46Zr42A17Gd5 BMG alloy with Kissinger equations are 340.7, 211.3, and 211.3 kJ/mol, respectively. These values with Ozawa equations are 334.8, 210.3, and 210.3 kJ/mol, respec- tively. The Cu46Zr45Al7Tb2 alloy presents the highest microhardness, Hv 590, while the Cu46Zr43A17Pr4 alloy presents the least, Hv 479. The compressive strength （at.f.） of the Cu46Zra3A17Gd4 BMG alloy is higher than that of the Cu46Zr43Al7Tb4 BMG alloy.

关键词： amorphous materials metallic glass rare-earth elements suction casting glass-forming ability mechanical property

Influences of preparation techniques on glass-forming ability of Fe-P-B-Si-C amorphous alloys

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Journal of Iron and Steel Research International 2018年第6期25卷 674-679页

作者： Ji-jun Zhang Ya-qiang Dong Lu-yang Bie Qiang Li Jia-wei Li Xin-min Wang Key Laboratory of Magnetic Materials and Devices NingboInstitute of Materials Technology and Engineering ChineseAcademy of Sciences Ningbo 315201 Zhejiang China Zhejiang Province Key Laboratory of Magnetic Materials andApplication Technology Ningbo Institute of MaterialsTechnology and Engineering Chinese Academy of SciencesNingbo 315201 Zhejiang China University of Chinese Academy of Sciences Beijing 100049China School of Physics Science and Technology XinjiangUniversity Urumqi 830046 Xinjiang China

It has been widely accepted that the ultrafast cooling rate is required for the glass formation of amorphous alloys. Here, the larger glass-forming ability （GFA） of Fe76P5（B0.5Si0.3C0.2）19 amorphous alloy was achieved by water quenching at lower cooling rate under argon atmosphere. Cylindrical rods with diameters of 1-2 mm were prepared by water quenching without flux treatment, Cu-mold injection casting, and Cu-mold suction casting, respectively. The influences of the preparation techniques with different cooling rates on GFA, thermal property, and nucleation/growth behavior were examined. The critical diameter of the Fe76P5（B0.5Si0.3C0.2）19 amorphous alloys is 1.7 mm for water quenching while smaller than 1.0 mm for injection casting. Microstructure analysis indicates that the crystallization and solidification processes are quite different between the water-quenched and the injection-cast rods. These findings could deepen fun-damental understanding on the relationship between the cooling rate, techniques, and GFA of Fe-based amorphous alloys.

关键词： Fe-based amorphous alloy Preparation technique glass-forming ability Crystallization behavior

Structural Origins for Enhanced Thermal Stability and glass‑forming ability of Co–B Metallic glasses with Y and Nb Addition

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Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 962-972页

作者： Shuang Ma Junyu Zhang Xudong Wang Rie Y.Umetsu Li Jiang Wei Zhang Man Yao Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute for Materials Research Tohoku UniversitySendai 980‑8577Japan

The effects of Y and Nb addition on thermal stability,glass-forming ability(GFA),and magnetic softness of Co75B25 metallic glass(MG)were comprehensively *** experimental results indicated that the thermal stability,GFA,and magnetic softness of the studied MGs increase in the order Co_(75)B_(25)forming units of the four MGs,connect through vertex-,edge-,and face-shared(VS,ES,and FS)atoms,and Co-centered units tend to connect with Co/B-centered units via the intercross-shared(IS)*** addition of Y and Nb not only plays the role of connecting atoms but also enhances both bond strengths and the fractions of icosahedral-like units in increasing order Co_(75)B_(25)ability,atomic packing density,and viscosity,thereby improving thermal stability and *** addition,the improvement of structural stability and homogeneity leads to enhanced magnetic softness.

关键词： Co-based metallic glasses Thermal stability glass-forming ability Soft magnetic property Ab initio molecular dynamics simulations Local atomic structure

Enhancement of glass-forming ability and thermal stability of a soft magnetic Co_(75)B_(25)metallic glass by micro-alloying Y and Nb

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Journal of Iron and Steel Research International 2021年第5期28卷 597-603页

作者： Feng Bao Yan-hui Li Zheng-wang Zhu Xin-yu Liang Yan Zhang Wei Zhang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina Institute for Materials Research Tohoku UniversitySendai 980-8577MiyagiJapan

Soft magnetic Co-based Co-Y-Nb-B bulk metallic glasses(BMGs)without Fe have been developed by micro-alloying Y and Nb into a C075B25 ***,addition of 3^at.%Y promotes the occurrence of glass transition and increases the supercooled liquid stability and magnetic softness.C0_(71.5)Y_(35)B_(25) metallic glass possesses a large supercooled liquid region(△T_(x))of 33 K and low coercivity(H_(c))of l.5 A/*** alloying 2-4 at.% Nb into C0_(71.5)Y_(35)B_(25) alloy further enlarges △T_(x) to 50 K,lowers H_(c) to 0.9 A/m,and enables the formation of BMGs with a critical sample diameter up to 2.0 *** alloying Nb causes the formation of complex(Co,Nb,Y)_(23)B_(6) competing phase during crystallization and widens the melt undercooling during solidification,which improves the supercooled liquid stability and glass-forming ability,***-Y-Nb-B BMGs also exhibit good soft magnetic and mechanical properties,i.e.,lowH_(c)of 0.9-1.2 A/m,relatively high saturation magnetic flux density of 0.36-0.57 T,high yielding strength of 3877-3930 MPa with plastic strain of 0.2%-0.3%,and high Vickers hardness of *** developed soft magnetic Co-based BMGs are promising for applications as structural and functional materials.

关键词： Co-based bulk metallic glass glass-forming ability Thermal stability Soft magnetic property Micro-alloying

Correlation between the glass-forming ability and activation energy of crystallization for Zr_(75-x)Ni_(25)Al_x metallic glasses

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International Journal of Minerals,Metallurgy and Materials 2013年第5期20卷 445-449页

作者： Yan-hui Li Wei Zhang Chuang Dong Jian-bing Qiang Akihiro Makino School of Materials Science and Engineering Dalian University of Technology Institute for Materials Research Tohoku University

The thermal stability and the kinetics of glass transition and crystallization for Zr75-xNi25Alx （x = 8-15） metallic glasses were investigated using differential scanning calorimetry （DSC） under continuous heating conditions. The apparent activation energy of glass transition rises monotonously with the A1 content increasing; the activation energy of crystallization increases with A1 changing from 8at% to 15at%, and then decreases with A1 further up to 24at%, which exhibits a good correlation to the thermal stability and the glass-forming ability （GFA）. The Zr60Ni25A115 metallic glass with the largest supercooled liquid region and GFA possesses the highest activation energy of crystallization. The relation between the thermal stability, GFA and activation energy of crystallization was discussed in terms of the primary precipitated phases.

关键词： metallic glass thermal stability glass-forming ability crystallization kinetics activation energy

Comparative Study of the Magnetic Properties and glass-forming ability of Fe-Based Bulk Metallic glass with Minor Mn, Co, Ni, and Cu Additions

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Acta Metallurgica Sinica(English Letters) 2016年第9期29卷 834-839页

作者： Md Anisur Rahman Yun-Zhuo Lu Qiang Luo Shou-Jiang Qu Feng-Xia Ye Yi-Xuan Wu Jun Shen School of Materials Science and Engineering Tongji University School of Materials Science and Engineering Dalian Jiaotong University

Fe43MsCra5Mo14C15B6Y2 （M = Mn, Co, Ni, and Cu in at.%） bulk metallic glasses （BMGs） are synthesized using the suction casting technique, and the glass-forming ability （GFA）, microstructure, and thermal and magnetic properties of these glasses are extensively examined using X-ray diffraction, differential scanning calorimeter, and vibrating sample magnetometer techniques. Among the four BMG alloys, Fe43NisCr15Mo14C15B6Y2 exhibits the lowest coercivity and the highest saturation magnetization, Curie temperature, effective magnetic moment, and GFA. By contrast, Fe43MnsCrlsMo14C15B6Y2 presents the poorest magnetic properties, such as the highest coercivity and the lowest saturation magnetization, Curie temperature, and effective magnetic moment. Fe43Cu5Cr15MolaC15B6Y2 demonstrates the lowest thermal stability and GFA. The observed thermal, structural, and magnetic properties of these BMG alloys are discussed in terms of the kinetics of BMG synthesization and the formation of different ferromagnetic, ferrimagnetic, and antiferromagnetic phases.

关键词： Bulk metallic glasses Saturation magnetization Effective magnetic moment Coercivity glass-forming ability

Data-driven glass-forming ability criterion for bulk amorphous metals with data augmentation

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Journal of Materials Science & Technology 2022年第26期121卷 99-104页

作者： Jie Xiong Tong-Yi Zhang School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518000China Hong Kong University of Science and Technology(Guangzhou) Guangzhou 511400China Material Genome Institute Shanghai UniversityShanghai 200444China

A data augmentation technique is employed in the current work on a training dataset of 610 bulk metallic glasses(BMGs),which are randomly selected from 762 collected *** ensemble machine learning(ML)model is developed on augmented training dataset and tested by the rest 152 *** result shows that ML model has the ability to predict the maximal diameter Dmaxof BMGs more accurate than all reported ML *** addition,the novel ML model gives the glass forming ability(GFA)rules:average atomic radius ranging from 140 pm to 165 pm,the value of TT/(T-T)(T-T)being higher than 2.5,the entropy of mixing being higher than 10 J/K/mol,and the enthalpy of mixing ranging from-32 k J/mol to-26 k J/*** model is interpretative,thereby deepening the understanding of GFA.

关键词： Materials informatics glass-forming ability Data augmentation Model interpretation Meta-ensemble model