The effect of energy input on reaction, phase transition and shape memory effect of NiTi alloy by selective laser melting

Zhao, Chunyang; Heng, Liang; Luo, Shuncun; Yang, Jyh‐Shinn; Wang, Zemin

doi:10.1016/j.jallcom.2019.153288

Cited by 73 publications

(30 citation statements)

References 44 publications

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“…In particular, the cost is lower than that of pre-alloyed powder. Therefore, the use of mixed element powders as raw materials for additive manufacturing preparation is a very promising processing method [36]. The spherical nickel powder, spherical titanium powder, and niobium powder with a particle size of 150-300 meshes are uniformly mixed by a high-energy ball mill at the atomic ratio of 47:44:9 (parameter is 300 r/min, 7 h) to prepare NiTiNb mixed powder.…”

Section: Materials and Process Parametersmentioning

confidence: 99%

“…In previous studies [11,31,34,35], the input energy density is often regarded as the key factor affecting the phase transformation behavior, and the phase transformation temperature increases with the increase of the energy density [36,37]. However, there are still some works that show that under the same energy density, there are significant differences in the phase transformation behavior of NiTi alloys [38,39].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Yang

et al. 2022

Applied Sciences

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NiTiNb is a wide-hysteresis shape memory alloy. The Laser Solid Forming (LSF) technology can overcome the shortcomings of the traditional long cycle processing to prepare NiTiNb. In this work, we studied the microstructure and phase transformation temperature of the NiTiNb prepared by LSF., in which the Ni + Ti + Nb mixed powder was melted under different laser power P, scanning speed v, layer thickness t, and energy density EV. The results show that the combination of LSF process parameters with P = 2000 W and v = 900 mm/min can obtain a good metallurgical bond. As the laser power increases, the grain size increases, and the proportion of equiaxed crystals increases, the martensite transformation temperature increases. The inhomogeneity of the LSF-NiTiNb microstructure results in different phase transformation temperatures even in the same sample. The subsequent heat treatment at 850 °C for 3 h increases the phase transformation temperature and hysteresis of LSF-NiTiNb. The tensile properties of the LSF-NiTiNb samples with different building heights are significantly different. The maximum elongation reaches 8% and the minimum elongation is only 0.8%. The LSF parameter combination in this work has reference value for the parameter selection of subsequent preparation of NiTiNb.

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Section: Materials and Process Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Yang

et al. 2022

Applied Sciences

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“…Ti 2 Ni is the most widely reported precipitate, mainly forming in the Ti-rich or near-equiatomic NiTi alloy system. 71,86 Depending on the process parameters and starting composition, the morphological structure of Ti 2 Ni precipitates can be formed in interdendritic regions (Fig. 9a) or uniformly dispersed in the matrix, more likely at grain boundaries (Fig.…”

Section: Microstructure Of Niti Alloy Processed By Lpbf: Grain Morphology Texture and Precipitationmentioning

confidence: 99%

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Safaei

Abedi

Nematollahi

et al. 2021

JOM

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NiTi shape memory alloys (SMAs) are used in a broad range of biomedical applications because of their unique properties including biocompatibility and high corrosion and wear resistance as well as functional properties such as superelasticity and the shape memory effect. The combination of SMAs and additive manufacturing can lead to revolutionary changes to the uses of SMAs in the biomedical industry. This article discusses the potential biomedical applications of NiTi that benefit from the AM process. We share the lessons learned in processing NiTi alloys with a focus on the laser powder bed fusion (LPBF) technique. The manufacturability, build quality, stable phases and transformation temperatures, microstructure, thermomechanical properties, microstructure tailoring, and functional properties of NiTi alloys produced via AM processing are reviewed. Current challenges such as expanding the process window, controlling the chemistry, and the performance and property responses are discussed, and potential opportunities including alloy design are discussed.

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“…NiTi alaşımlar şekil hafıza özellikleriyle birlikte yüksek korozyon direnci [4], biyouyumluluk, mükemmel aşınma direnci [5], süper elastiklik gibi eşsiz özelliklere sahiptir. Bu özellikleri sayesinde makine imalat [6], otomotiv, robotik ve biyomedikal uygulamalar [7], gibi geniş bir kullanım alanına sahiptir.…”

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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The effect of energy input on reaction, phase transition and shape memory effect of NiTi alloy by selective laser melting

Cited by 73 publications

References 44 publications

Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy Prepared by Laser Solid Forming Using Mixed Powder

Additive Manufacturing of NiTi Shape Memory Alloy for Biomedical Applications: Review of the LPBF Process Ecosystem

Toz metalurjisi ile Üretilen NiTi Alaşımına Al'un Etkisi

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