Superelastic behaviors of additively manufactured porous NiTi shape memory alloys designed with Menger sponge-like fractal structures

Zhao, Meng; Qing, H.B.; Wang, Yongxin; Liang, Jin; Zhao, Mengyao; Geng, Yongliang; Liang, Junzhe; Lu, Bingheng

doi:10.1016/j.matdes.2021.109448

Cited by 64 publications

(34 citation statements)

References 61 publications

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“…However, slopes proximal to n = 1 were reported in porous parts with the conventional formation sequence of Menger sponge but made of NiTi alloy (Zhao et al , 2021) and PLA (Kushwaha et al , 2021). In NiTi parts, Zhao et al (2021) reported stress-induced martensite transformation during the compressive testing. Thus, this phase transformation could influence the mechanical behavior of NiTi parts.…”

Section: Discussionmentioning

confidence: 99%

“…As shown, the E eff values obtained for Menger pre-fractal sponge of Ti-6Al-4V alloy using Xie's approach fitted quite well to the Gibson and Ashby model with n = 2 (Figure 9). However, slopes proximal to n = 1 were reported in porous parts with the conventional formation sequence of Menger sponge but made of NiTi alloy (Zhao et al , 2021) and PLA (Kushwaha et al , 2021). In NiTi parts, Zhao et al (2021) reported stress-induced martensite transformation during the compressive testing.…”

Section: Discussionmentioning

confidence: 99%

“…Kushwaha et al (2021) studied the influence of pores shape (square, cylindrical, hexagonal and elliptical) and porosity volume, controlled by N value, in the mechanical properties of PLA parts; besides evaluated the acoustic behavior of the porous parts with elliptic pore shape. On the other hand, Zhao et al (2021) studied NiTi parts' superelastic behavior as a function of the porosity volume. The porosity volume of these parts depended on the respective N value and fractal dimension.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Miyamoto et al (2005) manufactured Menger pre-fractal sponge with N equal to 3 using the vacuum fusion method and a low melting point metal (Bi-Pb-Sn-In eutectic alloy, T F = 70°C), which was poured into a resin mold manufactured by AM, with the inverted form of a Menger pre-fractal sponge. Recently, Kushwaha et al (2021) and Zhao et al (2021) reported obtaining Menger pre-fractal sponges using AM techniques from Polylactide (PLA) filament and NiTi alloy powder, respectively, with N from 1 to 3.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and mechanical properties of hierarchical porous parts of Ti-6Al-4V alloy obtained by powder bed fusion techniques

Sallica-Leva

Costa

Santos

et al. 2021

RPJ

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Purpose This paper aims to describe the obtainment of Ti-6Al-4V parts with a hierarchical arrangement of pores by additive manufacturing, aiming at designing orthopedic implants. Design/methodology/approach The experimental methodology compares microstructural and mechanical properties of Menger pre-fractal sponges of Ti-6Al-4V alloy, manufactured by laser powder bed fusion (LPBF) and electron beam powder bed fusion (EBPBF), with three different porosity volumes. The pore arrangement followed the formation sequence of the Menger sponge, with hierarchical order from 1 to 3. Findings The LPBF parts presented a martensitic microstructure, while the EBPBF parts presented an α + ß microstructure, independently of its wall thickness. The LPBF parts presented higher mechanical resistance and effective stiffness than the EBPBF parts with similar porosity volume. The stiffness values of the Menger pre-fractal sponges of Ti-6Al-4V alloy, between 4 and 29 GPa, are comparable to those of the cortical bone. Furthermore, the deformation behavior presented by the Menger pre-fractal sponges of Ti-6Al-4V alloy did not follow the Gibson and Ashby model's prediction. Originality/value To the best of the authors' knowledge, this is the first study to obtain Menger pre-fractal sponges of Ti-6Al-4V alloy by LPBF and EBPBF. The deformation behavior of the obtained porous parts was contrasted with the Gibson and Ashby model's prediction.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and mechanical properties of hierarchical porous parts of Ti-6Al-4V alloy obtained by powder bed fusion techniques

Sallica-Leva

Costa

Santos

et al. 2021

RPJ

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“…The NiTi shape memory alloy was firstly discovered at the US Navy Ordnance Laboratory. The NiTi alloy possesses the advantage of shape memory effect (SME), super elastic (SE) and excellent corrosion resistance [ 1 , 2 , 3 ], which is widely used in automotive, aerospace, and other fields [ 4 , 5 , 6 , 7 , 8 , 9 ]. Chang et al [ 10 ] found the optimal shape memory effect of the NiTi alloy was obtained at 300 °C × 100 h through studying the influence of aging process on the shape memory effect and superelastic properties.…”

Section: Introductionmentioning

confidence: 99%

Research on the Hot Deformation Behavior of the Casting NiTi Alloy

et al. 2021

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The hot deformation behavior and processing maps of the casting NiTi alloy were studied at the deformation temperature of 650–1050 °C and the strain rate of 5 × 10−3–1 s−1 by Gleeble-3800 thermal simulating tester. The variation of the strain rate sensitivity exponent m and the activation energy Q under different deformation conditions (T = 650–1050 °C, ε˙ = 0.005–1 s−1) were obtained. The formability of the NiTi alloy was the best from 800 °C to 950 °C. The constitutive equation of the casting NiTi alloy was constructed by the Arrhenius model. The processing map of the casting NiTi alloy was plotted according to the dynamic material model (DMM) based on the Prasad instability criterion. The optimal processing areas were at 800–950 °C and 0.005–0.05 s−1. The microstructure of the casting NiTi alloy was analyzed by TEM, SEM and EBSD. The softening mechanisms of the casting NiTi alloy were mainly dynamic recrystallization of the Ti2Ni phase and the nucleation and growth of fine martensite.

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Penetration Resistance of Cast Metal−Ceramic Composite Lattice Structures

et al. 2021

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A challenging issue in armor mechanics is to optimize the impact resistance of a target per unit areal mass. Herein, the penetration resistance of an A356 alloy–ceramic lattice structure with ceramic tiles encapsulated in the metal matrix is experimentally and computationally studied to achieve this objective. A hybrid additive manufacturing/metal‐casting technique is used to fabricate the structure. The performance is experimentally evaluated by impacting the tiles at normal incidence with 0.30‐cal armor‐piercing projectiles and 7.62 M80 rounds traveling at high speed. X‐ray imaging and electron microscopy techniques are used to ascertain the quality of the castings and the damage caused to the target by the projectiles. The cast material is tested following ASTM standard E8/E8M to determine the yield stress and hardening coefficients in the Johnson–Cook model. Large deformations of the components are analyzed using the finite element software LS‐DYNA. The penetrator's computed residual velocities differ from their test values by less than 4% for the 0.30‐cal projectiles and 19% for the ball rounds. The effects of several design variables (e.g., tile thickness and location, among others) are numerically scrutinized. The proposed design is ≈20% lighter than the solid metal target to achieve the same residual velocity of the penetrator.

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Superelastic behaviors of additively manufactured porous NiTi shape memory alloys designed with Menger sponge-like fractal structures

Cited by 64 publications

References 61 publications

Microstructure and mechanical properties of hierarchical porous parts of Ti-6Al-4V alloy obtained by powder bed fusion techniques

Microstructure and mechanical properties of hierarchical porous parts of Ti-6Al-4V alloy obtained by powder bed fusion techniques

Research on the Hot Deformation Behavior of the Casting NiTi Alloy

Penetration Resistance of Cast Metal−Ceramic Composite Lattice Structures

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