In vitro and in vivo studies on biodegradable CaMgZnSrYb high-entropy bulk metallic glass

Li, H.F.; Xie, Xinhui; Zhao, Kun; Wang, Y.B.; Zheng, Yufeng; Wang, W.H.; Qin, Ling

doi:10.1016/j.actbio.2013.01.029

Cited by 159 publications

(65 citation statements)

References 57 publications

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“…These conditions are in line with the empirical rules for BMG formation [64]. The number of reported high entropy BMGs is still not large [67][68][69][70][71][72][73][74][75]. Some of the reported alloys do have larger critical diameters.…”

Section: High-entropy Bulk Metallic Glass (Hebmg)supporting

confidence: 61%

“…The latter has a yield strength of 2142 MPa and a plasticity of 4% [77] 20 shows homogeneous flow and a remarkable plasticity (~25%) at room temperature [68]. CaMgZnSrYb, a high-entropy modification of Ca 65 Mg 15 Zn 20 BMG, was found to promote osteogenesis and bone formation after two weeks of implantation [69]. High entropy metallic glasses could also have improved thermal stability.…”

Section: High-entropy Bulk Metallic Glass (Hebmg)mentioning

confidence: 99%

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Three Strategies for the Design of Advanced High-Entropy Alloys

Tsai

2016

Entropy

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High-entropy alloys (HEAs) have recently become a vibrant field of study in the metallic materials area. In the early years, the design of HEAs was more of an exploratory nature. The selection of compositions was somewhat arbitrary, and there was typically no specific goal to be achieved in the design. Very recently, however, the development of HEAs has gradually entered a different stage. Unlike the early alloys, HEAs developed nowadays are usually designed to meet clear goals, and have carefully chosen components, deliberately introduced multiple phases, and tailored microstructures. These alloys are referred to as advanced HEAs. In this paper, the progress in advanced HEAs is briefly reviewed. The design strategies for these materials are examined and are classified into three categories. Representative works in each category are presented. Finally, important issues and future directions in the development of advanced HEAs are pointed out and discussed.

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Section: High-entropy Bulk Metallic Glass (Hebmg)supporting

confidence: 61%

Section: High-entropy Bulk Metallic Glass (Hebmg)mentioning

confidence: 99%

Three Strategies for the Design of Advanced High-Entropy Alloys

Tsai

2016

Entropy

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“…Very recently CaMgZnSrYb, a high-entropy modification of Ca 65 Mg 15 Zn 20 BMG, has shown improved properties in orthopedic applications. [48] CaMgZnSrYb not only has better mechanical properties, but also promotes osteogenesis and new bone formation after two weeks of implantation. These examples indicate that high-entropy BMGs and amorphous films do have great potential and deserve further exploration-which is good news for both communities.…”

Section: High-entropy Bulk Metallic Glass Althoughmentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,622

853

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High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

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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

344

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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In vitro and in vivo studies on biodegradable CaMgZnSrYb high-entropy bulk metallic glass

Cited by 159 publications

References 57 publications

Three Strategies for the Design of Advanced High-Entropy Alloys

Three Strategies for the Design of Advanced High-Entropy Alloys

High-Entropy Alloys: A Critical Review

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

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