Novel Ti–Zr–Hf–Fe Nanostructured Alloy for  Biomedical Applications

Hynowska, Anna; Blanquer, Andreu; Pellicer, Eva; Fornell, Jordina; Suriñach, S.; Baró, María Dolors; González, S.; Ibáñez, Elena; Barrios, Leonardo; Nogués, Carme; Sort, Jordi

doi:10.3390/ma6114930

Cited by 33 publications

(21 citation statements)

References 36 publications

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“…Based on the assumption that all boron which is not in solution in titanium reacts to form TiB and given that the relative densities of the Ti and TiB phases are 4.51 gcm -3 and 4.54 gcm -3 [27], respectively, the estimated volume fraction of the TiB phase, , is In addition to the reduced elastic modulus and hardness, nanoindentation can be used to assess the wear resistance of a material [30]. In fact, it is increasingly recognized that the wear resistance of a material is related to its ability to resist elastic strain to failure at the nanometer scale which is indicated by the ratio of hardness to reduced modulus (H/E r ) [33,58]. A combination of high hardness and low elastic modulus typically indicates good wear properties [33].…”

Section: Resultsmentioning

confidence: 99%

“…In fact, it is increasingly recognized that the wear resistance of a material is related to its ability to resist elastic strain to failure at the nanometer scale which is indicated by the ratio of hardness to reduced modulus (H/E r ) [33,58]. A combination of high hardness and low elastic modulus typically indicates good wear properties [33]. Another parameter, H 3 /E r 2 , referred to as yield pressure [33,59], shows the resistance to plastic deformation.…”

Section: Resultsmentioning

confidence: 99%

“…where P and h indicate the applied load and penetration depth during nanoindentation, respectively, the term β is a constant related to indenter geometry (β = 1.034 for a Berkovich indenter) [33] and E r is the reduced elastic modulus defined as:…”

Section: Methodsmentioning

confidence: 99%

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Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Attar

Ehtemam-Haghighi

Kent

et al. 2017

Materials Science and Engineering: A

230

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Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the nanoindentation load, H and Er were decreased. Comparison of the nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using nanoindentation and the wear evaluation from conventional wear tests

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Attar

Ehtemam-Haghighi

Kent

et al. 2017

Materials Science and Engineering: A

230

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“…Exploratory alloy discovery, design and development is a crucial aspect of materials research for the growth of industries such as aerospace [1], biomedical [2,3] and energy generation and storage [4]. Recently, this aspect of material research has expanded past that of the conventional alloy (consisting of 1 or 2 principle components) into a new class of highly alloyed materials, high-entropy alloys (HEAs).…”

Section: Introductionmentioning

confidence: 99%

Predicting the formation and stability of single phase high-entropy alloys

King

Middleburgh

McGregor³

et al. 2016

Acta Materialia

302

120

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Abstract:A method for rapidly predicting the formation and stability of undiscovered single phase high-entropy alloys (SPHEAs) is provided. Our software implementation of the algorithm uses data for 73 metallic elements and rapidly combines them -4, 5 or 6 elements at a time -using the Miedema semi-empirical methodology to yield estimates of formation enthalpy. Approximately 186,000,000 compositions of 4, 5 and 6 element alloys were screened, and ~1,900 new equimolar SPHEAs predicted. Of the 185 experimentally reported HEA systems currently known, the model correctly predicted the stability of the SPHEA structure in 177. The other sixteen were suggested to actually form a partially ordered solid solution -a finding supported by other recent experimental and theoretical work. The stability of each alloy at a specific temperature can also be predicted, allowing precipitation temperatures (and the likely precipitate) to be forecast. This combinatorial algorithm is described in detail, and its software implementation is freely accessible through a webservice allowing rapid advances in the design, development and discovery of new technologically important alloys. , and re-iterated by others since then [1,12], defines a HEA as any alloy consisting of 5 or more elements between 5 -35 at. %. As such, this type of HEA will usually possess a microstructure consisting of two or more distinct phases, some of which are likely to be brittle intermetallic compounds. Although, multiphase strengthening is sometimes desirable in alloys, a large amount of any brittle phase will generally make an alloy unusable as a structural material and such HEAs are therefore mundane. However, as will be discussed shortly, in a few special cases, the additional entropy of the multi-element composition will stabilise a microstructure consisting of either (i) a single solid solution having one of the simple close-packed crystal structures (FCC, HCP or BCC) or (ii) a duplex microstructure consisting of two such simple solid solutions. Generally, it is these non-trivial examples of HEA that interest investigators.This is because the resulting random solid solution(s) will exhibit a combination of ductility coupled with significant solid solution hardening. We recommend use of the term single 2 phase high-entropy alloy (SPHEA) as a more restrictive term to differentiate the rare and desirable single phase type of HEA from generic examples of multiphase HEAs.Combining Yeh's compositional limits [7] with the requirement for a single phase solid solution, we can define a SPHEA as an alloy with  4 alloying elements, at least 4 of which with a molar ratio between 0.33 -1 to that of the highest contributing element. These alloys must be able to display a single phase of simple, random, close-packed structure below the solidus.We return now to the factors that might stabilise a SPHEA. The prevailing hypotheses were (i) that the simple crystal structure or structures are thermodynamically stabilised, relative to possible intermetallic compounds, by the inc...

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“…The higher the ratio of H/E r , the better the wear resistance of the material [28]. Another parameter related to wear characteristics is H 3 /E 2 r , this being indicative of the resistance of the material to plastic deformation when subjected to an applied load contact [29,30]. The higher the value of H 3 /E 2 r , the better the material's resistance to plastic deformation [29].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Brittle-Ductile Transition in Laser 3D Printing of Fe-Based Bulk Metallic Glass Composites

Xie

Chen

Gao

2019

Metals

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The effects of the α-Fe phase on mechanical properties and cracking of laser 3D printing Fe-based bulk metallic glass composites were investigated. The elastic recovery and plasticity index were characterized by nanoindentation. As the volume fraction of the α-Fe phase increases from 23.66% to 52.38%, the elastic modulus of printed samples suddenly drops. The samples exhibit a lower deformation resistance, and the plasticity index increases gradually. When the volume fraction of the α-Fe phase is 67.84%, the interaction between the α-Fe phase and matrix phase is smaller during expansion shrinkage. As a result, cracking is easy to initiate, which leads to the highest crack rate of the printed sample. However, as the volume fraction of the α-Fe phase increases to 83.31%, the hard brittle phase was sandwiched between the α-Fe phases similar to the finger structure plays key role in the plastic deformation. The plastic deformation releases large amounts of stress concentrated at the boundary and suppresses crack formation.

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Novel Ti–Zr–Hf–Fe Nanostructured Alloy for Biomedical Applications

Cited by 33 publications

References 36 publications

Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Nanoindentation and wear properties of Ti and Ti-TiB composite materials produced by selective laser melting

Predicting the formation and stability of single phase high-entropy alloys

Brittle-Ductile Transition in Laser 3D Printing of Fe-Based Bulk Metallic Glass Composites

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