Microstructure and mechanical properties of in-situ nano γ-Al2O3p/A356 aluminum matrix composite

Microstructural evolution and mechanical properties of friction stir processed ZrB2/6061Al nanocomposites

Microstructure refinement and strengthening mechanisms of bimodal-sized and dual-phased (TiCn-Al3Tim)/Al hybrid composites assisted ultrasonic vibration

Microstructure and mechanical properties of an Al-Zn-Cu-Mg alloy processed by hot forming processes followed by heat treatments

Synergistic reinforcement of in situ (ZrB2+TiB2) particles and Er on microstructure and properties of 6082Al matrix composites

The effects of Er addition on the microstructure and properties of an in situ nano ZrB2-reinforced A356.2 composite

Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction γ′ phase

The industrial large-scale 7055 aluminum alloy fabricated by spray forming technology was subjected to hot extrusion and heat treatment to achieve high strength and ductility. Microstructure of the as-deposited alloy indicates that higher density billets with equiaxed grains (20–40 μm) were fabricated rather than a typical dendritic microstructure of the as-cast alloy. The grains of the as-extruded alloy exhibit fibrous morphology, the original boundaries disappear and fined second phases with size about 0.5–5 μm distribute along with extrusion direction. Meanwhile, the defects could be eliminated by hot extrusion, which resulted in good strength as well as ductility. The ultimate tensile strength, yield strength and elongation of the as-extruded alloy are 345 MPa, 236 MPa and 18.5%, respectively. After heat treatment, the partial recrystallization is observed around the un-recrystallized grains and sub-grains. And the platelet/rod-shaped precipitates (MgZn2) show a uniform distribution in the matrix alloy. The alloy reaches the maximum tensile strength of 730 MPa after T6 temper treatment, associated with a fine precipitation (MgZn2). However, with further deepen aging degree (from T6 to T73 temper), the size of dominant precipitated phases (MgZn2) grows obviously, the grain boundary precipitates transform from continuous to individual ones and the width of precipitate free zone increases. The result shows that the alloy after T7X temper treatment exhibits higher electrical conductivity (>35 %IACS) and facture toughness (>25.6 MPa m1/2) although a 8%–17% reduction in strength compared with that at T6 temper.

http://iopscience.iop.org/article/10.1088/2053-1591/aaa56b/pdf

Effects of hot extrusion and heat treatment on microstructure and properties of industrial large-scale spray-deposited 7055 aluminum alloy

The in situ (TiB2 + ZrB2)/7055Al composites were successfully fabricated from the 7055Al-K2TiF6-K2ZrF6-KBF4 system by a direct melt reaction method. Microstructural observations revealed that the n...

Effects of (TiB2 + ZrB2) nanoparticles on microstructure and properties of 7055Al matrix composites

The invention relates to an aluminum-based composite material, in particular to a high-strength and high-modulus in-situ aluminum-based composite material and a preparation method thereof. According to the aluminum-based composite material, commercial pure aluminum serves as a raw material, through component adjusting and controlling, in-situ micron/nano compositing, alloying, deformation processing and thermal treatment technologies are combined, and the strength and the modulus of alloys are improved synergistically; under adjusting and controlling of an electromagnetic field, the particle size of reinforcements which are generated through a reaction is the micron/nano scale, distribution is even, the in-situ synthetic yield of the reinforcements is high, and the high-strength and high-modulus in-situ particle reinforced aluminum-based composite material with the high-content reinforcements is easy to composite.

Min Wang

Papers

The effects of Er addition on the microstructure and properties of an in situ nano ZrB2-reinforced A356.2 composite

Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction γ′ phase

Effects of hot extrusion and heat treatment on microstructure and properties of industrial large-scale spray-deposited 7055 aluminum alloy

Effects of (TiB2 + ZrB2) nanoparticles on microstructure and properties of 7055Al matrix composites

High-strength and high-modulus in-situ aluminum-based composite material and preparation method thereof