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Effect of Si on Phase Equilibria, Mechanical Properties and Tribological Behaviour of Al-Cu Alloy

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Abstract

In the current work, novel Al-rich Al90-XCu10Six (x = 2.5 at%, 5 at%, 7.5 at%) ternary alloys were used to evaluate the effect of Si on Al-Cu alloy in an effort to design and develop new lightweight metal alloys with unique microstructure as well as superior mechanical and good wear resistance properties. The solidification behaviour of the studied alloy was predicted by thermodynamic simulation using the ThermoCalc software and compared with experimental results. The microstructure of the studied Al-rich ternary alloys reveals the presence of dendritic phases (i.e., L → L + α-Al) followed by peritectic reaction (i.e., L + α-Al → Al2Cu) or eutectic reaction (i.e., L → α-Al + θ-Al2Cu) and finally the evolution of ternary eutectic reaction (i.e., L → α-Al + θ-Al2Cu + β-Si) for the investigated Al-Cu-Si alloys. It is found that the hardness increased from 150 ± 6.64 HV to 221.9 ± 6.81 HV with the addition of Si from 2.5% to 7.5%. The least wear scar depth of 48 μm is obtained for Al87.5Cu10Si7.5 alloy, signifying better wear resistance properties as compared to other alloys. The wear property is found to be 14.2 KN-m/mm3 for AlCuSi7.5 alloy, which is better as compared to the wear properties of AlCuSi2.5 alloy (i.e., 6.9 KN-m/mm3) at a particular load of 5 N. It is also observed that the wear resistance and microhardness properties increase with the addition of Si % with the slight reduction of tensile strength from 240 MPa to 215 MPa.

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Acknowledgements

The Authors would like to thank Ministry of Human Resources and Development for funding Teaching Assistance scholarship.

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Authors and Affiliations

  1. Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore, Madhya Pradesh, 453552, India

    Sandeep Jain, Mahesh Patel, Vinod Kumar & Sumanta Samal

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  1. Sandeep Jain
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  2. Mahesh Patel
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  3. Vinod Kumar
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  4. Sumanta Samal
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Contributions

Sandeep Jain: Conceptualization, Investigation, Methodology, Formal Analysis, Alloy development, Comparison of results, Writing an original draft, Mahesh Patel: Investigation, Formal Analysis, Comparison of results, Vinod Kumar: Supervision, Formal Analysis, Writing- Review & Editing, Sumanta Samal: Conceptualization, Methodology, Resources, Formal Analysis, Writing- Review & Editing, Supervision, Funding acquisition.

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Correspondence to Sumanta Samal.

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Jain, S., Patel, M., Kumar, V. et al. Effect of Si on Phase Equilibria, Mechanical Properties and Tribological Behaviour of Al-Cu Alloy. Silicon 15, 1807–1820 (2023). https://doi.org/10.1007/s12633-022-02131-6

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  • DOI: https://doi.org/10.1007/s12633-022-02131-6

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