Metal-ceramic composites generally exhibit limited strength-plasticity synergy due to pronounced difference in elastic and plastic deformation between “soft phase” and “hard phase”, bottlenecking their applications. This work proposes a novel microstructure design concept using refractory metals and intermetallics to offer compromises between “soft phase” and “hard phase”. A cost-effective fabrication method was used to produce 70 vol% (TiC + Al6MoTi + Mo)/Al cermet. The cermet is composed of submicron-TiC, micron-Al6MoTi and nano-Mo particles separated by Al in homogeneous microstructure. This multiple length-scale microstructure could delocalize stress concentration, enhance work hardening and deformation compatibility in cermet, resulting in unprecedentedly enhanced strength-plasticity synergy. Ultimate compressive strength, plastic strain and product of strength and plasticity of (TiC + Al6MoTi + Mo)/Al at room temperature and 573 K respectively are 1227 MPa, 6.9%, 7445 MPa·% and 781 MPa, 15.0%, 10021 MPa·%, which are increased by ~30%, ~25%, ~60% and ~37%, ~9%, 41% respectively compared with those for traditional 70 vol% TiC/Al. This work opens new perspectives for the design and application of metal-ceramic composites with high strength and plasticity synergy.

Unprecedented enhancement in strength-plasticity synergy of (TiC+Al6MoTi+Mo)/Al cermet by multiple length-scale microstructure stimulated synergistic deformation

Al–Zn–Mg–Cu alloys that are prone to segregation and hot cracks always encounter difficulty in manufacturing large-size workpiece with desirable strength-plasticity synergy, especially when the tonnage of the extruder exceeds 6000 tons. This work puts forward a novel idea to address this challenge by joining extruded profiles of Al–Zn–Mg–Cu-based composite reinforced by trace in-situ TiC–TiB 2 nanoparticles through friction stir welding (FSW). The extruded profiles of Al–Zn–Mg–Cu-based composite along transverse direction (TD) achieved superior yield strength ( σ Y ) of 827 MPa and large plastic strain ( ε p ) of 10.2%. The σ Y of FSW-ed joint along TD reached 847 MPa, and the ε p was maintained at 2.8%. It was found that trace nanoparticles can weaken the grain boundary segregation of the composite ingot significantly, effectively avoiding the hot cracking that may occur during hot extrusion and FSW. In extruded profiles, nanoparticles promoted the nucleation of η′ precipitates, promoted the dislocation multiplication, and increased the proportions of low-angle grain boundaries (LAGBs) within 2°–15° and high-angle grain boundaries (HAGBs), thereby enhancing the strength. Meanwhile, nanoparticles increased the density of LAGBs and facilitated the precipitation of Guinier–Preston (GP) zones, which facilitated to maintain high plasticity of the extruded profiles of composite. Additionally, nanoparticles can effectively inhibit the abnormal grain growth in nugget zone (NZ) during post-weld heat treatment (PWHT), which strengthened the FSW-ed joint. This work elaborated the multiscale microstructure evolution mechanisms, offering guidance to fabricate Al–Zn–Mg–Cu workpieces with infinitely extensive size as required in actual manufacturing and fantastic mechanical performances. • Trace in-situ TiC–TiB 2 enhanced performance of large-size Al–Zn–Mg–Cu composite. • TiC–TiB 2 optimized segregation, recrystallization and precipitation behavior. • TiC–TiB 2 inhibited the abnormal grain growth during post-weld heat treatment. • Microstructure evolution and performance improvement mechanisms were revealed. 

Exploring the potential of FSW-ed Al–Zn–Mg–Cu-based composite reinforced by trace in-situ nanoparticles in manufacturing workpiece with customizable size and high mechanical performances

Microstructure evolution, mechanical property response and strengthening mechanism induced by compositional effects in Al–6Mg alloys

Effect of Combined Addition of Zr, Ti and Y on Microstructure and Tensile Properties of an Al-Zn-Mg-Cu Alloy

Effect of combined addition of Zr, Ti and Y on microstructure and tensile properties of an Al-Zn-Mg-Cu alloy

Effect of pretreatment on microstructural stability and mechanical property in a spray formed Al-Zn-Mg-Cu alloy

Deformation-induced ultrafine grains near fatigue crack tip and correlative fatigue damage in Al matrix composite

The precipitation behaviors and mechanical properties of the slowly-quenched 7085Al alloy subjected to various aging treatments were studied by multi-scale microstructural and mechanical properties characterization techniques. There were coarse quench-induced precipitates (QIPs) including η phases and lath-shaped S phases identified at grain boundaries and Al3Zr particle interfaces during the slow quenching process. Both precipitate free zone and precipitate rich zone were characterized in the slowly-quenched samples after various aging treatments. It was found that the average size of the age-induced precipitates (AIPs) after the double-step aging treatment (D3) was finer, and the number density of the AIPs was larger than those after the single-step aging treatment (S1). Meanwhile, the precipitate free zones around the coarse QIPs and at grain boundaries became narrower in the D3 sample. Critically, the heterogeneous nucleation of η′ phase on the lath-shaped S phase which was previously unreported has been characterized. The orientation relationship between the η’ phase and S phase was determined, and the detailed mechanism was discussed based on heterogeneous nucleation theory. Furthermore, the yield strength and ultimate tensile strength of the D3 sample increased by ∼94.4 MPa and ∼65.9 MPa over the S1 sample, respectively. Finally, the underlying mechanisms of such yield strength variations were discussed. The mixture rule was used to model this microstructure-mechanical property relationship quantitatively, in which the calculated results showed the good agreement with the measured results.

Improved microstructures and mechanical properties for 7085Al alloy subjected to slow quenching by aging treatment

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Papers

Effect of pretreatment on microstructural stability and mechanical property in a spray formed Al-Zn-Mg-Cu alloy

Deformation-induced ultrafine grains near fatigue crack tip and correlative fatigue damage in Al matrix composite

Improved microstructures and mechanical properties for 7085Al alloy subjected to slow quenching by aging treatment