Additive manufacturing of NiTiHf high temperature shape memory alloy

Elahinia, Mohammad; Moghaddam, Narges Shayesteh; Amerinatanzi, Amirhesam; Saedi, Soheil; Toker, Guher P.; Karaca, H.E.; Bigelow, Glen S.; Benafan, Othmane

doi:10.1016/j.scriptamat.2017.10.016

Cited by 101 publications

(35 citation statements)

References 41 publications

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“…To minimize the defect caused by melt splashing, the scanning direction was restricted to be always opposite to the air flow. Cubic specimens with a size of 10×10×10 mm 3 The samples for OM observations were etched by the reagent composed of 3.2 % HF, 14.1 % HNO 3 and 82.7 % H 2 O in volume fraction. Further microstructure observations were conducted using a JEOL 2100 transmission electron microscope (TEM) equipped with energy dispersive X-ray spectrum operated at 200 kV.…”

Section: Methodsmentioning

confidence: 99%

“…However, such a solid phase transformation occurring in the shape memory alloys renders them difficult to process and machine. The spring back effects, burr formation and adhesion in conventional processing and machinery [3,4] eventually lead to the non-accurate control of the geometry for final products. Selective laser melting as a kind of laser powder bed fusion additive manufacturing technology enables the deposition of powder materials layer by layer onto substrate and thus has advantages of direct forming, time and consumable save as well as the personalized design.…”

Section: Introductionmentioning

confidence: 99%

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Laser beam energy dependence of martensitic transformation in SLM fabricated NiTi shape memory alloy

Yang

Zhan

et al. 2019

Materialia

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser beam energy dependence of martensitic transformation in SLM fabricated NiTi shape memory alloy

Yang

Zhan

et al. 2019

Materialia

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“…In both cases, line energy E L was 0.067 J/mm 2 , but hatch spacing was decreased from Sample A to Sample B from 75 to 35 µm. Sample A shows a moderate remanence and low coercivity of 0.52 T and 558 kA/m, respectively and a maximum energy product of only 28 kJ/m 3 . The values are significantly below the characteristics of the initial powder.…”

Section: Magnetic Properties Of Lpbf-generated Nd-fe-b Permanent Magnetsmentioning

confidence: 99%

“…However, it is at the moment limited to a few structural metals like steels, aluminum and titanium alloys [1]. For metallic functional materials, only shape memory alloys based on NiTi and NiTiHf received considerable scientific interest so far [2,3]. The current development state of additive manufacturing of magnetic materials is actually limited to some proof of principle studies.…”

Section: Introductionmentioning

confidence: 99%

Laser powder bed fusion of Nd–Fe–B permanent magnets

2020

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In this work, we use laser powder bed fusion (LPBF) to produce Nd-Fe-B magnets. A suitable process window is developed, which allows to fabricate isotropic samples with outstanding magnetic performance. The sample quality is mainly defined by the energy input during LPBF and sintering or delamination occurs, if the process parameter are improperly adjusted. Magnetic and structural properties become better as energy input increases, until the material-specific limit for processability has been reached. Magnets with coercivity of 886 kA/m (µ 0 H c = 1.1 T) and maximum energy product of 63 kJ/m 3 can be produced from Nd-lean commercial powder without any post treatment. Thereby, our samples represent the new benchmark for permanent magnets produced by additive manufacturing. On the example of coercivity, the impact of laser power, scan velocity and hatch spacing is discussed. It is shown that coercivity can be sufficiently well described by a simple phenomenological model.

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“…Compared with other SMAs, such as iron-based and copper-based alloys, NiTi-based SMA have high strength and plasticity, good corrosion resistance, and excellent biocompatibility. Therefore, they have a great potential for biomedical applications [6][7][8][9]. As in typical NiTi-based ternary alloys, Nb plays an important role in NiTi-Nb alloys, because the addition of Nb increases the transition hysteresis of NiTi alloys [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Nb on the Microstructure and Compressive Properties of an As-Cast Ni44Ti44Nb12 Eutectic Alloy

et al. 2019

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The addition of Nb can form a eutectic phase with a NiTi matrix in a NiTi-based shape memory alloy, improving the transition hysteresis of the NiTi alloy. A Ni44Ti44Nb12 ingot was prepared using the vacuum induction melting technique. Under compression deformation, the yield strength of the NiTi–Nb alloy is about 1000 MPa, the maximum compressive strength and strain can reach 3155 MPa and 43%, respectively. Ni44Ti44Nb12 exhibited a superelastic recovery similar to that of the as-cast NiTi50. Meanwhile, the loading–unloading cycle compression shows that the superelastic recovery strain reached a maximum value (2.32%) when the total strain was about 15%, and the superelasticity tends to rise first and then decrease as the strain increases.

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Additive manufacturing of NiTiHf high temperature shape memory alloy

Cited by 101 publications

References 41 publications

Laser beam energy dependence of martensitic transformation in SLM fabricated NiTi shape memory alloy

Laser beam energy dependence of martensitic transformation in SLM fabricated NiTi shape memory alloy

Laser powder bed fusion of Nd–Fe–B permanent magnets

Effects of Nb on the Microstructure and Compressive Properties of an As-Cast Ni44Ti44Nb12 Eutectic Alloy

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