Local mechanical responses near single grain boundaries (GBs) of 9.8 mol% Y2O3-stabilized ZrO2 bicrystals, SrTiO3 bicrystal, and Al2O3 polycrystal were investigated by nanoindentation at room temperature to reveal GB contributions the properties. Contrary concept Hall–Petch strengthening, hardness showed negligible variations among interiors, vicinities, just on GBs in samples. Importantly, may...

Molybdenum alloys are excellent candidates for extremely high temperature environments, such as in nuclear thermal propulsion spaceflight systems. Spark plasma sintering is a useful manufacturing technique that allows rapid fabrication of refractory materials difficult to sinter using more traditional methods. Pre-alloyed molybdenum with 30 wt% tungsten powder was consolidated spark under varie...

Yield phenomena during the tensile testing of pure titanium sheets 0.2 mm and 0.4 in thickness were investigated detail focusing on effects grain size (d), (t), t/d ratio direction. With decreasing size, yielding behavior changed from continuous to one accompanied with yield point drop. Upper lower stresses 0.2%-proof stress followed Hall–Petch relationship; however, coarse-grained specimens (d...

In this work, we investigated the influence of composition on polycrystalline structure, elastic properties and fracture strength, ZrxSi1-x, NbxSi1-x, MoxSi1-x free-standing thin films that were deposited by magnetron sputtering subsequently annealed at 500 °C. Despite deviations from stoichiometric composition, crystalline structure all films, except for most Zr-rich corresponded to their resp...

Known as having a stress self-accommodation characteristic, the laser cladding shape memory alloy (SMA) coatings have been widely used in material failure repair. Nevertheless, their further development is greatly limited by low microhardness (250 HV0.2) and corrosion resistance. Benefiting from capability of refined grain adjusted microstructure, rare earth oxides play key role improving prope...

Abstract Grain refinement by severe plastic deformation (SPD) techniques, as a mechanism to control microstructure (recrystallization, grain size changes,…) and mechanical properties (yield strength, ultimate tensile strain, hardness variation…) of pure aluminium conductor wires, is topic great interest for both academic industrial research activities. This paper presents an innovative finite e...

The evolution of strain hardening behavior the Fe50(CoCrMnNi)50 medium-entropy alloy as a function fraction recrystallized microstructure and grain size was studied using Hollomon Ludwigson equations. specimens under study were partially recrystallized, fully with ultrafine-grained microstructure, coarse grains. yield strength decreases steadily increases due to recovery process Hall–Petch effe...