Determination of the thermodynamic properties of Ni-Ti, Ni-Al, and Ti-Al, and nickel-rich Ni-Al-Ti melts based on the atom and molecule coexistence theory

Duan, Shengchao; Shi, Xiao; Zhang, Man-Cang; Li, Bin; Dou, Guan-Xiong; Guo, Jingjie

doi:10.1016/j.molliq.2019.111462

Cited by 10 publications

(2 citation statements)

References 76 publications

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“…Guanfei Xiao et al and Yongquan Ning et al [1,2] discussed effect of processing parameters on microstructure development of Ni-based superalloys GH 4037 and GH 4133B by semisolid metal formation and electron beam welding. Shengchao Duan et al and Guo Wei et al [3,4] analyzed effect of thermodynamic properties of liquid Ni/Ti, Ni/Al and Ti/Al binary alloys and nickel-rich Ni-Al-Ti ternary alloy on phase transformation and mechanical properties through atom and molecule theory during laser welding. Qiu Hu et al and Liu Enze et al [5,6] analyzed effect of carbon, boron and rhenium elements on phase transformation, segregation behavior and microstructure morphology of nickel-based superalloys.…”

Section: Introductionmentioning

confidence: 99%

Weldability of Nickel/Aluminum Dissimilar Materials Laser Welding Part I: Microstructure Development, Solidification Behavior and Mechanical Properties of Polycrystalline Nickel-based Superalloy

Gao

2022

J. Phys.: Conf. Ser.

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Weldability-related issues, including asymmetrical weld pool shape, γ phase multicomponent microstructure development, solidification behavior and mechanical properties, of γʹʹ precipitation-strengthened polycrystalline nickel-based superalloy are experimentally analyzed during keyhole laser welding repair. The crucial relationship between them provides weldability improvement opportunities and defect-free high quality weld for feasible aerospace materials laser processing. Attractive neck transition region of weld is more vulnerable to coarser dendrite than bottom part in the vicinity of fusion boundary, and this location is also liable to abundant Laves/γ eutectic phase formation because of heat and solute accumulation. The dominant chemical inhomogeneity brings about microstructure anomalies and irregular morphology to deteriorate hot cracking resistance. Because of thermometallurgical factors of selective alloying partition in the molten pool, partition-resistant Cr is chemically accumulated in dendrite core, while partition-susceptible Ti, Al, Mo and Nb are enriched in high-supersaturation interdendrite region, which consequently result in serious segregation and extensive Nb-rich intermetallic phase formation across solidification interface. Dendrite refinement and aggressive Laves/γ eutectic phase formation suppression are not simultaneously satisfied by low heat input under nonequilibrium solidification conditions. Therefore, mechanical properties are only partially improved by diffusion-limited microstructure refinement as result of phase instability. In other words, reductions of tensile strength and ductility are attributed to brittle Laves/γ eutectic phase formation during terminal stage of solidification. The severity of eutectic reaction thermodynamically depends on nail-shaped keyhole profile, solidification conditions and solute redistribution ahead of solid/liquid interface. Additionally, viable control of weld metallurgical and mechanical properties progressively encourages optimal combination of laser power and welding speed to interdendritically minimize disadvantages of eutectic phase formation by a variety of welding conditions optimization.

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Section: Introductionmentioning

confidence: 99%

Weldability of Nickel/Aluminum Dissimilar Materials Laser Welding Part I: Microstructure Development, Solidification Behavior and Mechanical Properties of Polycrystalline Nickel-based Superalloy

Gao

2022

J. Phys.: Conf. Ser.

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“…Ni-Al-Ti üçlü sistemi nikel esaslı alaşımın önemli bir alt sistemidir. Bu malzemeler yüksek sıcaklık dayanımı, sürünme dayanımı, oksidasyon ve korozyon direnci gibi üstün özellikleri sayesinde havacılık ve yüzey kaplama endüstrisinde yaygın bir kullanım alanına sahiptir [14,15]. Farklı Al ilavesine sahip alaşımlar ve Al ilavesindeki artışın, tane inceltmesini desteklediğini ve makro-sertlik değerlerini arttırdığını bulmuşlardır.…”

Section: Introductionunclassified

Toz metalurjisi ile Üretilen NiTi Alaşımına Al'un Etkisi

Kiliç

2021

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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ÖzBu çalışmada, 2,4) alaşımı toz metalürjisi yöntemlerinden SHS ile üretildi. Üretilen NiTiAl alaşımlarında Al oranının numunelerin mikroyapılarına ve mikrosertliklerine etkileri detaylı bir şekilde incelendi. Mikroyapı analizleri optik mikroskobu(OM) ve taramalı elektron mikroskobu (SEM) ile faz bileşenleri ise Enerji Dağılımlı Spektroskopi (EDX) ve X-Işınları Kırınım Cihazı (XRD) analizi ile tespit edildi. Sertlik ölçüm testleri Vickers (Hv) mikrosertlik ölçüm cihazında yapılmıştır. Ateşleme sonrası ekzotermik reaksiyon sonucunda başlayan yanma reaksiyonu esnasında yüzeyde oluşan sıcaklık değişimi lazer sıcaklık ölçüm cihaz ile tespit edildi. Optik mikroskop(OM) analizleri sonucunda Al içeriğinin artmasına bağlı olarak gözenek oranın arttığı gözlenmektedir. Ayrıca Al ilavesiz NiTi numunesinde ise yanma kanallarının yoğun olduğu görüldü. Hem EDX hem de XRD anliz sonuçlarında alaşımlarda NiTi, NiTi2 ve Ti3Al fazlarının varlığı tespit edildi. Yüzey sıcaklık ölçüm sonuçlarında yanma reaksiyonu en düşük 550℃ elde edilirken en yüksek ise 1250℃ ölçüldü. Mikrosertlik ölçüm sonuçlarında en düşük sertlik değeri 176.8 HV0,5 ağ. %4 Al numunesinden elde edilirken, en yüksek değer ise 301.7 HV0,5 NiTi numunesinde ölçüldü.

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Determination of viscosity and surface tension of liquid Ni–Al–Ti system using the evaluated thermodynamic properties by AMCT

Duan

2020

J Mater Sci

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Determination of the thermodynamic properties of Ni-Ti, Ni-Al, and Ti-Al, and nickel-rich Ni-Al-Ti melts based on the atom and molecule coexistence theory

Cited by 10 publications

References 76 publications

Weldability of Nickel/Aluminum Dissimilar Materials Laser Welding Part I: Microstructure Development, Solidification Behavior and Mechanical Properties of Polycrystalline Nickel-based Superalloy

Weldability of Nickel/Aluminum Dissimilar Materials Laser Welding Part I: Microstructure Development, Solidification Behavior and Mechanical Properties of Polycrystalline Nickel-based Superalloy

Toz metalurjisi ile Üretilen NiTi Alaşımına Al'un Etkisi

Determination of viscosity and surface tension of liquid Ni–Al–Ti system using the evaluated thermodynamic properties by AMCT

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