Effect of process parameters on the phase transformation behavior and tensile properties of NiTi shape memory alloys fabricated by selective laser melting

Wang, Xiebin; Yu, Jiaqi; Liu, Jiangwei; Chen, Liugang; Yang, Qin; Wei, Huiliang; Sun, Jie; Wang, Zuocheng; Zhang, Zhihui; Zhao, Guoqun; Humbeeck, Jan Van

doi:10.1016/j.addma.2020.101545

Cited by 77 publications

(80 citation statements)

References 74 publications

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“…%): 45.5 ± 0.2 Ti, 44.9 ± 0.2 Ni, and 9.6 ± 0.4 Nb. The obtained composition is characterized by a decreased Ni content due to its evaporation during the SLM process, which is consistent with the results on the SLM of NiTi alloys reported in the literature [16,39]. Figure 6 shows the chemical distribution of the elements in the NiTiNb sample produced using the E1 parameter set.…”

Section: Resultssupporting

confidence: 88%

“…Conventionally, Ni 47 Ti 44 Nb 9 alloy parts are made by casting or sintering powder materials, which have limitations in terms of part geometry, as well as control of their microstructure and properties [13][14][15]. In this regard, it is promising to use additive manufacturing (AM) techniques, in particular, the selective laser melting (SLM) method for the manufacture of parts from alloys with the shape memory effect [16].…”

Section: Introductionmentioning

confidence: 99%

“…For example, rapid solidification promotes the formation of a supersaturated solid solution matrix [25]. At the same time, various process parameters can result in different microstructures and phase composition of nitinol alloys [26], as well as different Ni content resulting in significant changes in transformation behavior [16].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of NiTi-Based Eutectic Shape Memory Alloy Produced via Selective Laser Melting In-Situ Alloying by Nb

Polozov

Popovich

2021

Materials

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This paper presents the results of selective laser melting (SLM) process of a nitinol-based NiTiNb shape memory alloy. The eutectic alloy Ni45Ti45Nb10 with a shape memory effect was obtained by SLM in-situ alloying using a powder mixture of NiTi and Nb powder particles. Samples with a high relative density (>99%) were obtained using optimized process parameters. Microstructure, phase composition, tensile properties, as well as martensitic phase transformations temperatures of the produced alloy were investigated in as-fabricated and heat-treated conditions. The NiTiNb alloy fabricated using the SLM in-situ alloying featured the microstructure consisting of the NiTi matrix, fine NiTi+β-Nb eutectics, as well as residual unmelted Nb particles. The mechanical tests showed that the obtained alloy has a yield strength up to 436 MPa and the tensile strength up to 706 MPa. At the same time, in-situ alloying with Nb allowed increasing the hysteresis of martensitic transformation as compared to the alloy without Nb addition from 22 to 50 °C with an increase in Af temperature from −5 to 22 °C.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of NiTi-Based Eutectic Shape Memory Alloy Produced via Selective Laser Melting In-Situ Alloying by Nb

Polozov

Popovich

2021

Materials

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“…The XRD pattern of sintered NiTi 150 composite consists of desirable B19′ (martensite NiTi) and B2 (austenite NiTi) with some other phases (i.e., Ni 3 Ti and NiTi 2 ). The closely packed Ni and Ti particles at high compaction pressure accelerate the alloying of the NiTi and promote NiTi phase formation due to enhanced diffusion of atoms 38,39 .…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Physical and Mechanical Behavior of NiTi Composite Fabricated by Newly Developed Uni-Axial Compaction Die

Singh

Sharma²,

Sharma³

2021

Mat. Res.

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Owing to better mechanical properties and shape memory effect, the NiTi composites fabricated by powder metallurgy are suitable for biomedical implants. However, the excessive porosity and formation of micro-cracks are the major issues related to the NiTi composite. This work focused on developing crack-free dense NiTi composites by newly developed uni-axial compaction die. The work includes the design and manufacturing of uni-axial compaction die. The die was tested by SOLIDWORKS software in a simulated environment. Further, composite samples were successfully fabricated without circumferential micro-cracks at 1910.82 MPa compaction pressure. The effects of compaction pressure on microstructural, densification, and mechanical behavior of NiTi composites were also analyzed. Microstructural characterization shows that the Ni-rich phase increased and the Ti-rich phase decreased with the increase of compaction pressure. The porosity reduces from 17.04 to 8.75% by increasing the compaction pressure from 1273.88 to 1910.82 MPa, and a maximum density of 5.50 g.cm -3 was obtained. The NiTi 150 composite has similar Young's modulus, and compressive strength (6.93 GPa and 94.36 MPa) compared to cortical and cancellous bone. The high compaction pressure also increases the micro-hardness of NiTi composite up to 453.8 HV 0.5 .

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“…[ 29 ] Recently, SLM has become very attractive for the fabrication of NiTi components [ 30–34 ] and significant efforts have been mainly focused on the selection of the process parameters that maximize the thermo‐mechanical performance. [ 35–42 ] With this regard, the control of energy input ( E ) is adopted as the main criteria to study the SLM process as it links different process parameters:

E = \frac{P}{t \cdot v \cdot h}

( P is the laser power, t is the layer thickness, v is the scan speed, and h is the hatch distance). [ 43 ] For NiTi alloys, values of E in the range of 55 to 222 J mm −3 provide high density and low porosity level within the produced samples.…”

Section: Introductionmentioning

confidence: 99%

A Study on Damping Property of NiTi Elements Produced by Selective Laser‐Beam Melting

et al. 2021

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The damping properties of NiTi elements produced through selective laser melting are investigated by tuning the process parameters. To this end, twelve parameters’ sets are selected to fabricate fully‐dense NiTi specimens. Damping is evaluated through loss factor index, mechanical loading cycles (up to 104 cycles), solicitation frequency and strain amplitude. Results confirm that NiTi fabricated through selective laser‐beam melting is an excellent candidate to substitute conventional materials when used in the martensite phase. Furthermore, the selected process parameters enable specific damping performances that can be collected in damping maps which turn out to be practical tools for the fabrication of NiTi parts with tunable damping response.

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Effect of process parameters on the phase transformation behavior and tensile properties of NiTi shape memory alloys fabricated by selective laser melting

Cited by 77 publications

References 74 publications

Microstructure and Mechanical Properties of NiTi-Based Eutectic Shape Memory Alloy Produced via Selective Laser Melting In-Situ Alloying by Nb

Microstructure and Mechanical Properties of NiTi-Based Eutectic Shape Memory Alloy Produced via Selective Laser Melting In-Situ Alloying by Nb

Physical and Mechanical Behavior of NiTi Composite Fabricated by Newly Developed Uni-Axial Compaction Die

A Study on Damping Property of NiTi Elements Produced by Selective Laser‐Beam Melting

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