Influence of Annealing Time on Microstructure and Mechanical Properties of Al-14.5Si Alloy Prepared by Super-Gravity Solidification and Cold-Rolling

Abstract

In this paper, super-gravity solidification and cold-rolling were utilized to obtain Al-14.5Si alloys. The influence of annealing time on microstructure and mechanical properties of Al-14.5Si alloys was investigated. Our results indicated that high elongation was achieved by super-gravity solidification due to the submicron eutectic Si, making it possible to undertake the conventional cold-rolling. The yield strength (~214 ± 11 MPa) was significantly enhanced (~68.5%) after cold-rolling mainly due to high dislocation density. The coarsening of eutectic Si could be observed during annealing, which resulted in a decrease in yield strength. The elimination of internal stress and lattice distortion during annealing led to a decrease in micro-cracks/voids beneath the fracture surface during tensile testing, which in turn enhanced the elongation.

Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing

“…Considerable attention has been paid to the exploration of more thermally stable phases of cast Al-Si-Cu-Mg-Ni alloys to improve their mechanical properties [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. The addition of alloying elements is an effective method owing to the formation of resistant phases, such as ε-Al 3 Ni, M-Mg 2 Si, δ-Al 3 CuNi, γ-Al 7 Cu4Ni, θ-Al 2 Cu, Q-Al 5 Cu 2 Mg 8 Si 6 , T-Al 9 FeNi, and π-Al 8 Si 6 FeMg 3 [ 16 , 17 ].…”

Special Issue: “Advanced Light Metal and Alloys: Preparation, Characterization, and Applications”

“…Studies [1][2][3][4][5][6][7][8] report effects of alloying elements (Sm, Er, In, Bi, Zn, Mg and Cu), preparation technology (cold pressing deformation, annealing, etc.) and microstructure on performance of aluminum alloys.…”

“…Yi et al [7] present an investigation of the hot stamping-in-die quenching composite forming (HFQ) process of 5083 aluminum alloy skin, which is a promising technology to compensate for the poor formability of the aluminum alloy sheet at room temperature. Gan et al [8] investigate the influence of annealing time on microstructure and mechanical properties of Al-14.5Si alloy prepared by super-gravity solidification and cold rolling.…”