Microstructure and Mechanical Properties of 4343/3003/6111/3003 Four-Layer Al Clad Sheets Subjected to Different Conditions

Abstract

To meet the lightweight demands of automobiles, Al composite sheets require excellent mechanical properties under the condition of minimal thickness after high-temperature brazing processing. Generally, the standard used Al brazing sheets have a low strength before and after brazing. To overcome this issue, this work develops a novel 4343/3003/6111/3003 four-layer Al clad sheet, whose microstructure and mechanical properties are systematically investigated. The results show the observable fibrous microstructure with elongated grains parallel to the rolling direction in the developed four-layer Al clad sheet of the cold-rolled and annealed states. After brazing, this fibrous microstructure transforms into coarse equiaxed grains. In addition, the 4343 layer is the brazing layer. Si is mainly distributed in the 4343 layer of the cold-rolled Al clad sheets, whereas Si penetrates into the core layer along the grain boundaries after brazing. The cold-rolled samples present a certain brittleness from fracture morphology, whereas the final annealed ones show a typical ductile fracture. Meanwhile, the typical intergranular fracture is visible after brazing. The mechanical properties of the Al clad sheets are improved after brazing, with an increase of 76% in tensile strength and 62% in yield strength, compared with the final annealed ones. The elongation is increased by 29% compared with that of the cold-rolled ones. This study provides a theoretical basis for further improvement of the strength of aluminum honeycomb panels.

Effect Factors on the Performances of Commercial Al Alloy as Anode for Al-Air Batteries

“…Furthermore, there are lots of precipitates randomly dispersed on the Al surface. The energy-dispersive X-ray spectroscopy (EDS) mapping shows that the precipitates are mainly rich-Fe and rich-Si phases (Table S5), which aggravate the self-corrosion of Al due to the high potential difference within the Al matrix and its own low hydrogen evolution overpotential. − The Al matrix around the precipitates is easily dissolved, and then the second phase falls off, which caused the formation of corrosion pits (Figure S3). In contrast, the 7075 alloy shows the relatively uniform and smooth corrosion morphologies with smaller and shallower corrosion holes, confirming the smaller self-corrosion rate.…”

Microstructure, Mechanical, and Corrosion Performance of AA4343/AA3003/AA4343 Laminated Sheets Subjected to Cryorolling and Annealing

“…The diffusion of Si from the Al matrix to the Al 6 (Fe, Mn) secondphase particles transforms into a eutectoid structure consisting of α-Al-(Fe, Mn)-Si. [11,16,17] Si diffusion occurs along the secondphase particle, producing eutectic phases with Al in the grain boundary. This phenomenon occurs during annealing, specifically at temperatures ranging from 350 °C to 425 °C, and the diffusion of Al into poly-Si films has been quantified using sputter profiling techniques, revealing to permeate through the grain boundaries of Si.…”

“…[ 11,15 ] After annealing the AA4343/AA3003/AA4343 sheet, several Si precipitates of α‐Al (Mn, Fe) Si and α‐AlMnSi occur inside the diffusion layer along the grain boundaries. [ 16–18 ]…”

“…[11,15] After annealing the AA4343/AA3003/AA4343 sheet, several Si precipitates of α-Al (Mn, Fe) Si and α-AlMnSi occur inside the diffusion layer along the grain boundaries. [16][17][18] Slat spray test (ASTM B117) [19] is the most extensively used resistivity method for various heat exchanger materials. The anodic polarisation curves of both non-brazed and brazed clad exhibit similarities, indicating that the corrosion rate of the material exposed to a 3.5 wt% NaCl solution is comparable, and pitting is the leading corrosion product of the non-brazed composite sheet.…”

Cold Rolling Technology Optimization for EN AW 4343/3003/4343 Cladded Aluminum Alloys and Influence of Parameters on Microstructure, Mechanical Properties and Sustainable Recyclability

“…In comparison to the mentioned reference, numerical simulated and industrial cold rolling has been optimized as a novelty in the studies published so far. Kang et al [8] successfully extended the cladding of materials by incorporating EN AW 6111 between EN AW 3003 and EN AW 4343. The age-hardened alloy enhances mechanical properties during brazing, performed at a temperature close to the melting point for a short duration (600 • C-3 min) [9].…”