Fcc nanostructured TiFeCoNi alloy with multi-scale grains and enhanced plasticity

Extraordinary strength-ductility synergy in a heterogeneous-structured β -Ti alloy through microstructural optimization

“…By comparison with the coarse-grained Gum Metal (1.0 at.% O), the doubleyielding observed in heterogeneous-structured samples mainly originates from the inherited microstructural heterogeneity as widely reported in heterostructured materials [15]. Moreover, the HS80 sample shows a remarkable feature of strain-hardening-rate retention over a wide strain range (region III), leading to excellent tensile ductility [8]. A high strain hardening capability is thus essential to evade the typical strength-ductility trade-off.…”

“…In recent years, many research efforts have been devoted to the design of distinct microstructures consisting of heterogeneous structures to overcome the strength-ductility trade-off dilemma. Examples include producing harmonic structures with micrometer-sized grains surrounded by ultrafine grains [4][5][6], generating spatially grain-size gradient microstructures [7][8][9][10][11], designing heterogeneous materials with large-sized lamella domains embedded into a matrix of ultrafine grains [12,13], and other complex hierarchical structures [14,15]. The resulting materials, with the heterogenous features, have exhibited remarkable strength-ductility enhancement compared to their homogeneous counterparts.…”

Metastability in high-entropy alloys: A review

“…In the powder scale, mechanical alloying (MA) (often corresponded with various sintering techniques) is another viable approach to fabricate nanostructured bulk metallic solids. [110][111][112][113] In such processes, uniform solid solution phase is achieved owing to the high-energy mechanical milling. Fu et al 113 reported a design of a nanostructured medium entropy TiFeCoNi alloy (MEA) via MA and spark plasma sintering (SPS) technique.…”

“…[110][111][112][113] In such processes, uniform solid solution phase is achieved owing to the high-energy mechanical milling. Fu et al 113 reported a design of a nanostructured medium entropy TiFeCoNi alloy (MEA) via MA and spark plasma sintering (SPS) technique. This single FCC phase MEA displayed a unique multiscale grains characteristics with distinctively coarse grains (.1 lm) together with nanograins.…”

Development of novel ultrafine grain cu metal matrix composites reinforced with Ti-Cu-Co-M (M: Ni, Zr) amorphous-nanocrystalline powder

“…Materials similar to metallic glasses are the high amorphous phase containing alloys with moderate to low nanocrystalline phase content, obtained via annealing of amorphous structure or powder metallurgy route. By introducing nanocrystals in situ formed in the glassy matrix, the ductility of BMGs can be improved without sacrificing strength [29,30]. In nanocrystalline composite alloys, a new strengthening mechanism should be applied due to the smaller size of grain boundaries and grain-boundary segregates.…”