The Influence of Process Conditions and Reinforcement Characteristics on the Densification and Mechanical Properties of Powder Metallurgy SiCp/Al Composites
Liuxu Cao, Qingsong Dai, Qiwen Liang, Xiaoyong Zhang
TL;DR
This study improves the production of aluminum composites by optimizing process conditions and material composition for better strength and density.
Contribution
A novel approach combining pure aluminum powder with 2024 aluminum alloy and SiC to enhance powder compaction and mechanical properties.
Findings
Sintering at 600 °C for 30 min yields optimal interparticle bonding without precipitate or pore coarsening.
Hot pressing increases tensile strength by over 70% compared to sintering alone, reaching 343 MPa.
Higher SiC content and particle size in the hot-pressed state reduce mechanical performance.
Abstract
Compared to pure aluminum powder, aluminum alloy powders exhibit higher strength and hardness, which leads to greater difficulty in plastic deformation during cold compaction, consequently impairing green compact formation and subsequent densification. This study introduces pure aluminum powder into the raw material system based on 2024 aluminum alloy powder and SiC powder, effectively improving the powder compaction characteristics. A systematic investigation was conducted to examine the effects of sintering temperature (460–640 °C) and holding time (5–120 min) during pressureless sintering on the sintering shrinkage, relative density, mechanical properties, and microstructure of SiCp/Al composites reinforced with 35 wt.% of 31.9 μm SiC particles. The results indicate that sintering at 600 °C for 30 min constitutes the optimal process condition, achieving effective interparticle…
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Taxonomy
TopicsAluminum Alloys Composites Properties · Powder Metallurgy Techniques and Materials · Advanced ceramic materials synthesis