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Efficient prediction of corrosion behavior in ternary ni-based alloy systems:Theoretical calculations and experimental verification

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Journal of Materials Science & Technology 2023年第36期167卷 94-106页

作者： Xuelian Xiao Keke Chang Kai Xu Ming Lou Liping Wang Qunji Xue Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Pourbaix diagrams are calculated to describe electrochemical processes for alloys in aqueous *** the multi-component differentiation of alloy systems,the construction of Pourbaix diagrams is fac-ing challenges,especially for non-single-phase alloy *** this study,the simultaneous construction of phase diagrams and Pourbaix diagrams were implemented for predicting the evolution of the phases in the immune and passive *** CALPHAD(CALculation of PHAse Diagram)approach was used to quickly access the Gibbs free energies of various phases and the chemical potential of the elements in the phases from the thermodynamic database of the ni-Si-Al-Y *** corrosion behavior of two typical ni-Al-Si and ni-Al-Y systems was *** and Y were added to ni-based alloys to produce the solid solutions L12-ni_(3)(Al,Si)and L12-ni_(3)Al+ni_(5)Y,*** showed that niO and Al_(2)O_(3)make up the passive area of the ni_(3)Al 1 *** introduction of SiO_(2)and Y(OH)3 in the passive region separately helped to minimize the alloys’susceptibility to ***,Si reduced the thermody-namical possibility of niO for mation in the passive film,and the addition of Y caused extreme galvanic *** on ni-based alloys validated the results through electrochemical *** was also discovered that the presence of ni_(5)Y produced galvanic corrosion and that Si reduced the oxide in the passive film,causing pitting *** corrosion prediction of the quaternary alloys indicates that the solid solution of Si in ni_(5)Y reduces the galvanic corrosion effect and the dissolution of passive *** current work demonstrates that phase diagrams and Pourbaix diagrams may be efficiently and accurately predicted using a well-constructed thermodynamic database,which has major implications for future studies on the corrosion behavior of multi-component alloys.

关键词： Pourbaix diagrams CALPHAD ni-based alloys Passive film

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Effect of nonlinear liquidus and solidus on dendrite growth in bulk undercooled melts

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Transactions of Nonferrous Metals Society of China 2010年第3期20卷 490-494页

作者：陈正王海丰刘峰杨伟 State Key Laboratory of Solidification Processing North western Polytechnical University

On the base of nonlinear liquidus and solidus,an extended model for dendrite growth in bulk undercooled melts was developed under local non-equilibrium conditions both at the interface and in the bulk *** terms of thermodynamic calculations of the phase diagram,the model predictions are relatively realistic physically,since few fitting parameters are used in the model *** three characteristic velocities,*** critical velocity of absolute solute stability(VC*),the velocity of maximal tip radius(VRm),and the velocity of bulk liquid diffusion(VD),a quantitative agreement is obtained between the model predictions and the experimental results in undercooled ni-0.7%B and ni-1%Zr(molar fraction) alloys,and the overall solidification process can be categorized.

关键词： dendrite growth undercooled melts ni-based alloys

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Formation of ni57Zr20Ti22Ge1 amorphous powders by mechanical alloying

Formation of Ni57Zr20Ti22Ge1 amorphous powders by mechanical...

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中国颗粒学会第六届学术年会暨海峡两岸颗粒技术研讨会

作者：林鴻明陳繁雄陳錦毅蔡健益李丕耀 Department of Materials Engineering Tatung University Department of Materials Science and Engineering Feng Chia University Institute of Materials Engineering Taiwan Ocean University

In the current study,the amorphization behavior of mechanically alloyed niZrTiGe powder was examined in *** conventional X-ray diffraction results confirm that the fully amorphous powders formed after 5 hours of milling. The thermal stability of the niZrTiGe amorphous powders was investigated by differential scanning calorimeter(DSC). As the results demonstrated,the glass transition temperature(T) and the crystallization temperature(T) are 761 K and 839 K, *** supercooled liquid regionΔT is 78 *** appearance of wide supercooled liquid region may be mainly due to the Ge additions which cause the increasing differences in atomic size of mechanically alloyed niZrTiGe powders.

关键词： Mechanical alloying Amorphous phase Supercooled liquid region Glass transition ni-based alloys

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