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Determination of phase diagrams using the diffusion couple technique

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Rare Metals 2006年第5期25卷 427-430页

作者： XU Honghu DU Yong ZHOU Yichun JIN Zhanpeng State Key Laboratory of Powder Metallurgy Cenaxtl South University Changsha Hunan 410083 China Faculty of Material Photoelectronic Physics Xiangtan University Xiangtan 411105 China

It has been demonstrated that the diffusion couple technique is a powerful and efficient approach in establishing phase relationships of ternary systems. Accurate data on the phase equilibria can be obtained if the appropriate alloys are employed as end members of the diffusion couple. It is desirable to combine the diffusion couple technique with an investigation of the afterwards selected equilibrated alloys so that the precision and reliability of the obtained information about a ternary isotherm could be guaranteed.

关键词： phase equilibria diffusion couple electron probe microanalysis

Formation and Growth Kinetics of Intermediate Phases in Ni-Al diffusion couples

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Journal of Wuhan University of Technology(Materials Science) 2009年第5期24卷 787-790页

作者：任晓周文龙 National Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology School of Materials Science and Engineering Dalian University of Technology

Formation and growth of the intermediate phases in the Ni-Al diffusion couples prepared by pouring technique were investigated. Electron probe microanalysis, scanning electron microscopy and X-ray diffraction were used to characterize the product phases in the joints. The results show that two intermediate phases form in the sequence of NiAl3 and Ni2Al3 during solidification. After annealed, Ni2Al3 and NiAl3 still exist in the joints of the couples. The reasons for the formation of Ni2Al3 and NiAl3, as well as the absence of NiAl, Ni5Al3 and Ni3Al were discussed, respectively. The growth kinetics of both product phase layers indicates that their growth obeys the parabolic rate law. The activation energies and frequency factors for NiAl3 and Ni2Al3 phases were also calculated according to the Arrhenius equation.

关键词： Ni-Al diffusion couple growth kinetics intermediate phase parabolic rate law

Mechanisms of interfacial reactions between 316L stainless steel and MnO-SiO_(2) oxide during isothermal heating

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Journal of Iron and Steel Research(International) 2023年第8期30卷 1511-1523页

作者： Cheng-song Liu Fu-kang Li Hua Zhang Jie Li Yong Wang Yuan-yuan Lu Li Xiong Hong-wei Ni The State Key Laboratory of Refractories and Metallurgy.Wuhan University of Science and Technology Wuhan 430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hubei Guoan Special Steel Inspection Co. Ltd.Huangshi 435000HubeiChina

diffusion couple experiments were performed to study the thermodynamic and kinetic mechanisms of interfacial reactions between the 316L stainless steel and the composite MnO-SiO_(2) oxide during isothermal heating at 1473 K(1200℃)for 1,3,5,and 10 h and at 1173,1273,1373,1473,and 1573 K(900,1000,1100,1200,and 1300℃)for 3 *** variations in the 316L stainless steel and the composite MnO-SiO_(2) oxide in the vicinity of the steel-oxide interface in each diffusion couple specimen were *** and after isothermal heating,thermodynamic equilibria between the oxide and steel at the interface were estimated in accordance with the calculation of the Gibbs free energy change in the interfacial steel-oxide *** diffusion coefficients of Mn,Cr,and Si in 316L stainless steel under different experimental conditions were quantitatively *** results showed that solid-state interfacial reactions occurred between the Cr in the 316L stainless steel and composite MnO-SiO_(2) oxide during isothermal heating,which resulted in the depletion of Cr and accumulation of Si and Mn in the steel in the vicinity of the steel-oxide *** widths of the Crdepleted zone,Mn-accumulated zone and Si-accumulated zone all showed increasing trends with increasing isothermal heating temperature and *** average values of the diffusion coefficients of Mn,Cr,and Si in the steel at 1473 K(1200℃)were 1.21×10^(^(-14))±2.96×10^(-15),1.69×10^(-14)±2.54×10^(-15),and 1.00×10^(-14)±1.96×10^(-15) m^(2)s^(-1),respectively,and they continued to increase with increasing isothermal heating temperature.

关键词： 316L stainless steel diffusion couple Isothermal heating diffusion coefficient Interfacial reaction

Interfacial reaction between oxide inclusion and steel matrix deoxidized by Si and Mn at 1473 K

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Journal of Iron and Steel Research(International) 2018年第1期25卷 1-8页

作者： Xue-liang Zhang Shu-feng Yang Cheng-song Liu Jing-she Li Qing Liu Gang Liu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083 China Beijing Key Laboratory of Special Melting and Preparationof High-End Metals Beijing 100083 China The State Key Laboratory of Refractories and MetallurgyWuhan University of Science and Technology Wuhan 430081 Hubei China

An improved diffusion couple method was used to simulate the dynamic process of the solid-state reaction at the interface between oxide inclusions and a steel matrix deoxidized by Si and Mn during heat treatment at 1473 K. Experimental results indicated that good contact between the oxide and steel matrix was attained after pre-treatment at 1673 K. In addition, the reaction between the oxide and steel matrix at 1673 K was suppressed, and the effect of this reaction on the diffusion couple experiments at 1473 K was minimized. In the diffusion couple experiments, the diffusion of oxygen from the oxide to the steel matrix resulted in the precipitation of fine oxide particles and a decrease in the Mn content in the steel matrix near the interface after heat treatment at 1473 K. With increasing heat treatment time, the widths of the particle precipitation zone （PPZ） and Mn-depleted zone （MDZ） gradually increased. In addition, the solid-state reaction at the interface between the oxide and steel matrix was intense, and the widths of the PPZ and MDZ increased rapidly during the 0-20 h stage of heat treatment, especially during the 0-5 h stage. The interfacial reaction was retarded, and the rates of width expansion of PPZ and MDZ decreased with increasing heat treatment time.

关键词： Oxide inclusion diffusion couple Heat treatment Solid-state reaction Interfacial reaction

High-throughput development and applications of the compositional mechanical property map of the β titanium alloys

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Journal of Materials Science & Technology 2021年第12期71卷 201-210页

作者： Jinfeng Ling Dandan Huang Kewu Bai Wei Li Zhentao Yu Weimin Chen Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhouGuangdong510632China Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials Guangxi UniversityNanningGuangxi530004China Institute of High Performance Computing Agency for ScienceTechnology and ResearchSingapore138632Singapore

By a combination of the nanoindentation and electron probe microanalysis(EPMA)techniques,the traditional diffusion couple technique is extended to map the mechanical property of β-type Ti alloys over a wide composition range,which can be utilized to develop very versatile novel bio-Ti alloys for hard tissue re placements in arti ficial bones,joints,and dental *** create complete single-phase composition ranges of Ti-based bcc solid solution,12 types of bcc Ti-Nb-Zr-Mo/Ti-Nb-Zr-Ta quaternary diffusion couples were fabricated and annealed at 1273 K for 25 *** this way,the composition-mechanical property relationships in the vast composition space of Ti-based alloys were established using EPMA and nanoindentation ***,the measured composition-dependent Young’s moduli,hardness,and elastic recovery as well as the derived ratio of hardness to Young’s modulus,and the ratio of the cube of hardness to the square of Young’s modulus,in the developed compositional mechanical property database,were visualized in a five-dimensional scatter *** enables an effective tool to screen the Ti-Nb-Zr-based alloys fororthopedic and dental applications according to different clinical requirements,and to rationalize the fundamental mechanical relationships in the rapid development of β-Ti alloys.

关键词： Mechanical properties Ti–Nb–Zr–Mo and Ti–Nb–Zr–Ta alloys diffusion couple Nanoindentation

Pseudo-spinodal mechanism approach to designing a near-βhigh-strength titanium alloy through high-throughput technique

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Rare Metals 2021年第8期40卷 2099-2108页

作者： Li-Gang Zhang Jing-Lu Tang Zhen-Yu Wang Jing-Ya Zhou Di Wu Li-Bin Liu Patrick J.Masset School of Material Science and Engineering Central South UniversityChangsha410083China Key Laboratory of Nonferrous Metallic Materials Science and Engineering Ministry of EducationChangsha410083China State Key Laboratory of Powder Metallurgy Changsha410083China Faculty of Mechanical Engineering Koszalin University of TechnologyKoszalin75-453Poland

The main reason for the high strength in near-βtitanium alloys is the ultrafine precipitation of the acicular secondary a phase in theβ*** purpose of this study is to use the pseudo-spinodal mechanism to obtain the ultrafine a phase for the design of a new high-strength near-γtitanium *** calculations and TC21-(TC21+15 Mo)diffusion couple composition gradient experiments were used to demonstrate that TC21+3 Mo alloy can undergo a pseudo-spinodal decomposition to obtain the ultrafine a phase,resulting in a high-strength *** adjusting the heat treatment process to obtain a bimodal microstructure,the alloy exhibits a good balance between ultimate tensile strength(1351 MPa)and plasticity(8.5%strain).Thus,it was demonstrated that the pseudospinodal mechanism combined with a high-throughput diffusion couple technique is an effective method for designing high-strength titanium alloys.

关键词： High-strength titanium alloy TC21+xMo diffusion couple Pseudo-spinodal mechanism Microstructure and mechanical properties

diffusion REACTIONS BETWEEN Cu AND NbTi-ALLOY

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Acta Metallurgica Sinica(English Letters) 1989年第7期2卷 41-47页

作者： XU Leying WANG Wenbin ZHUANG Yuzhi Institute of Metal Research,Academia Sinica,Shenyang,China Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang,110015,China

diffusion reaction of superconductig composite NbTi/Cu assembled both mechanically and metallurgically,diffusion couples Ti/Cu and Nb/Cu have/been studied by means of *** results indicate that the initial interface state of the composite NbTi/Cu significantly affects the forming process of intermetallic compounds at the *** comparison with the metallurgically bound composite,the intermetallic com- pounds forms at a higher temperature in mechanically bound *** mechanical hinding process is beneficial to the production of NbTi/Cu superconducting composite. No intermetallic compounds have been observed in Nb/Cu *** morphology of intermetallic phases and the sequence in which they form in Ti/Cu system are somewhat different from that in NbTi/*** relationship between the thickness of compound layer and annealing time obeys the rule of y^(1.5) ∝ t.

关键词： superconduetor diffusion reaction copper NbTi alloy diffusion couple

Experimental Determination of Solid Solubility of Ce、La、Nd、Sm in Fe or Ni

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Rare Metals 1992年第2期11卷 115-119页

作者：王志谦李兴康刘国权张维敬潘树明 University of Science and Technology Beijing Beijing 100083China General Research Institute for Non-ferrous Metals Beijing 100088 China

The solid solubility of Ce、La、Sm and Nd in Fe or N i at various temperature was determined by means of a diffusion-couple method with the aid of an electron probe *** methods,namely area method and whole range method,were proposed for data processing in the present *** principle and re- lated problems in the experimental determination of the solid solubility of rare-earth elements in Fe or Ni by use of the above mentioned methods were also discussed.

关键词： Solid solubility Rare earths Fe Ni diffusion couple

ISOTHERMAL SECTION AT 1000 AND 1100℃ OF Fe-Mn-Al PHASE DIAGRAM

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Acta Metallurgica Sinica(English Letters) 1993年第7期6卷 1-5页

作者： LIU Xingjun HAO Shiming SUN Rongyao Northeast University of Technology,Shenyang,China Department of Materials Science and Engineering,Northeast University of Technology,Shenyang 110006,China

Phase equilibria at Fe-Mn side of isothermal section at 1000 and 1100℃ in Fe-Mn- Al system have been determined using the diffusion couple technique and metallography. A three-phase,α+γ+β,region was found at 1000℃.The method of solid/gas diffusion couple used to determine equilibrium phase composition is believed to be feasible for the system containing volatile component.

关键词： Fe-Mn-Al system phase equilibrium diffusion couple