背应力平衡策略实现非均质Al-SiC复合材料的强塑 性协同

Abstract

Strength-ductility trade-off dilemma remains a significant obstacle to high-strength composites due to the undesirable dislocation storability. Herein, an ingenious nano-micro SiC-reinforced Al matrix composite (AMC) with heterogeneous grain structures of coarse and fine grains was designed via a novel deformation-driven metallurgy method. The accumulated geometrically necessary dislocations and the intragranularly dispersed SiC particles were tailored based on the principle of back stress amelioration, which was a key point to maintain the dynamic balance with the applied stress toward strength-ductility synergy. The ultimate tensile strength and uniform elongation of the designed SiC 5np-5μp /Al composite reached 324 MPa and 12.9%, respectively, and the strength was 181% as high as that of the SiC 10μp /Al with only 3% ductility loss. As such, a new strategy was provided herein to promote strength-ductility synergy via the further modified back stress.

Achieving Good Strength–Plasticity Compatibility in Cu Composites via Carbon Nanotube‐Induced Heterogeneous Bimodal Structure

“…This has been confirmed by the study of Huang: “the metamorphic effect of strong plastic deformation and corresponding friction/deformation heat on solid and microstructure, effectively inhibiting the growth of recrystallized grains, having a fine grain structure, and achieving high strength and toughening efficiency”. [ 31–34 ] The HDI enhancement obtained by structural design and the strengthening of CNTs distributed in intracrystalline and intergranular effectively improve the strength–ductility synergy effect of BG‐1:1.…”

Effects of Ti2SnC MAX Phase on Microstructure, Mechanical, Electrical, and Wear Properties of Stir‐Extruded Copper Matrix Composite

“…The strength–ductility synergy could be enhanced effectively through the back stress engineering with the coarse–fine grain interface design and the reinforcements’ intragranular‐dispersed tailoring. [ 4 ]…”

“…The strength-ductility synergy could be enhanced effectively through the back stress engineering with the coarse-fine grain interface design and the reinforcements' intragranular-dispersed tailoring. [4] Among the most crucial plastic deformation techniques used to increase strength is pressure in equal channel angular pressing (ECAP), high-pressure torsion (HPT), accumulative roll bonding (ARB), torsion extrusion, friction stir back extrusion (FSBE), and friction stir processing (FSP). The most prevalent issue in strengthening based on plastic deformation is the lack of thermal stability of the microstructure at high temperatures, which leads to a drop in strength at high temperatures.…”

Microstructural Evolution of Ni-SiC Composites Manufactured by Spark Plasma Sintering

“…[1] Silicon carbide is also used as the reinforcement in metal, [2][3][4][5][6][7][8] ceramic, [9,10] or polymer matrix composites. [11,12] SiC addition can improve the thermal or mechanical properties, [13] especially in the case of metal matrix composites.…”