A high-entropy alloy with hierarchical nanoprecipitates and ultrahigh strength

Abstract

HEAs’ compositional space allows the design of hierarchical microstructures that contribute to the exceptional strength values.

A Review on Heterogeneous Nanostructures: A Strategy for Superior Mechanical Properties in Metals

“…On the other hand, there was also small section of crack along coherent TBs which have higher fracture resistances than incoherent GBs. Therefore, TBs could increase the fracture resistances effectively [111][112][113][114][115][116][117][118][119][120][121][122]. Xiong et al have indicated that 316L stainless steels with bundles of nanoscale deformation twins have beneficial to enhance the fracture resistance [113,114].…”

“…Precipitation strengthening is also considered to be an effective strengthening mechanism in HEAs. Fu dual-phase HEA that contains an FCC matrix (γ) with a small volume fraction of body-centered cubic (BCC) phase [118]. There are some primary nanoprecipitates γ and secondary nanoprecipitates γ* in FCC matrix.…”

“…Although the average domain diameter is as small as about 7 nm and the volume fraction is around 2.4%, these domains appear to be stable upon tensile deformation. Such heterogeneously architected nanostructure has been proven to be a valuable strategy to evade the strength-ductility trade-off in pure metals [117][118][119][120].…”

“…Metals with both high strength and large ductility are always desired for the structural applications, and such demands have been realized in the last decade by the novel strategy: tailoring the microstructures at nanoscale, i.e., the design of heterogeneous nanostructures [2,3]. These heterogeneous nanostructures include heterogeneous grain/lamellar/phase structures , gradient structure , nanotwins , and nanoprecipitates [116][117][118][119][120]. One common feature in these heterogeneous nanostructures is that there always exist various domains with dramatically different strengths, although the geometrical patterns and the structural sizes of the domains might vary widely [3,[14][15][16][17].…”

Room‐Temperature Synthesis of High‐Entropy Perovskite Oxide Nanoparticle Catalysts through Ultrasonication‐Based Method

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In the present study,asonochemical-based method for onepot synthesis of entropy-stabilized perovskite oxide nanoparticle catalysts with high surface area was developed. [7] Amongt his novel class of crystalline materials, high-entropy alloys were first reported in 2004 by the independentp ioneering works of Cantor et al and Yeh et al [5,6] Recent studies have extended the high-entropy concept to include the ionic compounds, in which five or more metallice lements have been used to populate as inglec ation sublattice to introduce highc onfigurational entropyi nto the crystal structure. Ta king advantage of the acoustic cavitation phenomenon in theu ltrasonication process, BaSr(ZrHf-Ti)O 3 ,B aSrBi(ZrHfTiFe)O 3 and Ru/BaSrBi(ZrHfTiFe)O 3 nanoparticles were crystallized as single-phase perovskite structures through ultrasonication exposure withoutc alcination.

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