Phase Equilibria of Si-C-Cu System at 700 °C and 810 °C and Implications for Composite Processing
Kun Liu, Zhenxiang Wu, Dong Luo, Xiaozhong Huang, Wei Yang, Peisheng Wang
TL;DR
This paper studies the phase behavior of silicon, carbon, and copper at two temperatures to improve the processing of composite materials.
Contribution
The first experimental investigation of the Si-C-Cu system's phase equilibria at 700 °C and 810 °C, with implications for composite processing.
Findings
At 700 °C, eight single-phase and six three-phase regions were identified.
At 810 °C, higher solubility of C and Si/Cu was observed, with new phases like bcc and liquid.
Optimal processing conditions produced composites with high bending strength of 998.61 MPa.
Abstract
The phase equilibria of the Si-C-Cu ternary system at 700 °C and 810 °C were experimentally investigated for the first time. Fifteen key alloys were prepared via powder metallurgy and analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). Isothermal sections were constructed based on the identified equilibrium phases. At 700 °C, eight single-phase regions and six three-phase regions—(C)+(Cu)+hcp, (C)+hcp+γ-Cu33Si7, (C)+γ-Cu33Si7+SiC, γ-Cu33Si7+SiC+ε-Cu15Si4, SiC+ε-Cu15Si4+η-Cu3Si(ht), and SiC+(Si)+η-Cu3Si(ht)—were determined. At 810 °C, nine single-phase regions and seven three-phase regions were identified. The solubility of C and Si/Cu in the various phases was quantified and found to be significantly higher at 810 °C compared to 700 °C. Key differences include the presence of the bcc (β) and liquid phases at 810 °C. The…
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Taxonomy
TopicsAluminum Alloys Composites Properties · Advanced materials and composites · Intermetallics and Advanced Alloy Properties