Open porous dealloying-based biomaterials as a novel biomaterial platform

Okulov, Ilya; Okulov, Artem; Soldatov, Ivan; Luthringer, Bérengère; Willumeit‐Römer, Regine; Wada, Takeshi; Kato, Hidemi; Weißmüller, J.; Markmann, Jürgen

doi:10.1016/j.msec.2018.03.008

Cited by 64 publications

(38 citation statements)

References 42 publications

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“…To synthesize the 3DNP HEA, we utilized liquid metal dealloying (LMD), a unique technique to fabricate non‐noble porous materials used in structural, functional, and medical products by preventing oxidation in a metallic melt . The high‐entropy design of LMD based on the enthalpy of mixing is depicted in Figure a,b.…”

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confidence: 99%

Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design

et al. 2019

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produced by dealloying have outstanding physical properties due to their unique structure with open porous networks, [3][4][5] the undesirable coarsening phenomenon leads to degradation of physical properties over time, even at room temperature. [6][7][8] The originally proposed idea behind high-entropy alloy (HEA) with multiprinciple elements is maximizing the configuration entropy to stabilize a solid-solution alloy without undesired ordered intermetallics. [9][10][11] Many studies have suggested that HEAs uniquely possesses combined desirable properties such as a high strength and ductility paired with high fracture toughness, [12][13][14] fatigue resistance, [15] and creep resistance. [16] HEAs also show promising properties in harsh environments resisting corrosion, [17][18][19] and irradiation [20] attacks. Atomic size differences between constituting elements in HEA increase the activation energy for grain growth, and sluggish diffusion kinetics has considered as the main reason for the exceptional high strength and structural stability of HEAs at high temperatures. [21,22] The rationale behind it, the multiprinciple elements cause larger fluctuations in lattice potential energy (LPE), providing many low-LPE sites that hinder atomic diffusion. [23] Grain growth and ligament coarsening rely on the same physical background of surface diffusion. In that context, the high-entropy design in nanoporous materials has a potential for achieving an exceptional stability against the coarsening.Controlling the feature sizes of 3D bicontinuous nanoporous (3DNP) materials is essential for their advanced applications in catalysis, sensing, energy systems, etc., requiring high specific surface area. However, the intrinsic coarsening of nanoporous materials naturally reduces their surface energy leading to the deterioration of physical properties over time, even at ambient temperatures. A novel 3DNP material beating the universal relationship of thermal coarsening is reported via high-entropy alloy (HEA) design. In newly developed TiVNbMoTa 3DNP HEAs, the nanoporous structure is constructed by very fine nanoscale ligaments of a solid-solution phase due to enhanced phase stability by maximizing the configuration entropy and suppressed surface diffusion. The smallest size of 3DNP HEA synthesized at 873 K is about 10 nm, which is one order of magnitude smaller than that of conventional porous materials. More importantly, the yield strength of ligament in 3DNP HEA approaches its theoretical strength of G/2π of the corresponding HEA alloy even after thermal exposure. This finding signifies the key benefit of high-entropy design in nanoporous materials-exceptional stability of size-related physical properties. This high-entropy strategy should thus open new opportunities for developing ultrastable nanomaterials against its environment.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design

et al. 2019

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“…Unfortunately, many alloys form intermetallics and many metals do not easily form solid solutions, which limits the dealloying methodology. Recently, nanoporous HEAs were produced through a rather novel method [55] by using liquid metal dealloying (LMD), a technique to fabricate non-noble porous materials by suppressing oxidation in a metallic melt [56][57][58][59][60][61][62]. It turned out that the structure of nanoporous TiVNbMoTa HEAs [55] can be described as nanoscale ligaments of a solid-solution phase, the stability of which is due to suppressed surface diffusion.…”

Section: Porous/cellular Systemsmentioning

confidence: 99%

High Entropy Alloys: Ready to Set Sail?

Basu

Hosson

2020

Metals

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Over the past decade, high entropy alloys (HEAs) have transcended the frontiers of material development in terms of their unprecedented structural and functional properties compared to their counterpart conventional alloys. The possibility to explore a vast compositional space further renders this area of research extremely promising in the near future for discovering society-changing materials. The introduction of HEAs has also brought forth a paradigm shift in the existing knowledge about material design and development. It is in this regard that a fundamental understanding of the metal physics of these alloys is critical in propelling mechanism-based HEA design. The current paper highlights some of the critical viewpoints that need greater attention in the future with respect to designing mechanically and functionally advanced materials. In particular, the interplay of large compositional gradients and defect topologies in these alloys and their corresponding impact on overall mechanical response are highlighted. From the point of view of functional response, such chemistry vis-à-vis topology correlations are extended to novel class of nano-porous HEAs that beat thermal coarsening effects despite a high surface to volume ratio owing to retarded diffusion kinetics. Recommendations on material design with regards to their potential use in diverse applications such as energy storage, actuators, and as piezoelectrics are additionally considered.

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“…Therefore, it is necessary to reduce the grain sizes of metastable β titanium alloys and restrict their growth. In order to overcome the drawback, lots of studies about beta-titanium alloys reinforced by intermetallic particles (or eutectic structures) were carried out [5][6][7][8][9][10][11][12]. The Ni and Co elements were partially segregated to the interdendritic region to form TiNi and TiCo intermetallic phases, resulting in fine interdendritic precipitates or eutectic structures to obtain high strength [5][6][7]13].…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement of Ti-15Mo-3Al-2.7Nb-0.2Si Alloy with the Rotation of TiB Whiskers by Powder Metallurgy and Canned Hot Extrusion

Hou

Gao

Cui

et al. 2020

Metals

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In situ synthesized TiB whiskers (TiBw) reinforced Ti-15Mo-3Al-2.7Nb-0.2Si alloys were successfully manufactured by pre-sintering and canned hot extrusion via adding TiB2 powders. During pre-sintering, most TiB2 were reacted with Ti atoms to produce TiB. During extrusion, the continuous dynamic recrystallization (CDRX) of β grains was promoted with the rotation of TiBw, and CDRXed grains were strongly inhibited by TiBw with hindering dislocation motion. Eventually, the grain sizes of composites decreased obviously. Furthermore, the stress transmitted from the matrix to TiBw for strengthening in a tensile test, besides grain refinement. Meanwhile, the fractured TiBw and microcracks around them contributed to fracturing.

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Open porous dealloying-based biomaterials as a novel biomaterial platform

Cited by 64 publications

References 42 publications

Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design

Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design

High Entropy Alloys: Ready to Set Sail?

Grain Refinement of Ti-15Mo-3Al-2.7Nb-0.2Si Alloy with the Rotation of TiB Whiskers by Powder Metallurgy and Canned Hot Extrusion

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