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Fracture Toughness and Thermal Investigations of Al 7075 — Cobalt Particulates Reinforced Alloy Composites Prepared Using High Vacuum Casting Method for Gear Applications: Proposed Thermal Conductivity and Fracture Toughness Modeling

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Abstract

This work reports thermo-mechanical, thermo-gravimetric, thermal conductivity, and fracture toughness behavior of Cobalt particulates (0–2wt% @ step of 0.5%) reinforced Al 7075 alloy composites fabricated via a high vacuum casting method for gear materials. The experimentally evaluated results show that thermo-mechanical and thermo-gravimetric magnitudes improve with reinforcing phase content. The fracture toughness measured experimentally at various crack lengths of 1, 3, and 5 mm was found to be in the range of 1.69–4.07 MPa.m1/2 and shows a rising trend with particulate content, while thermal conductivity (range 130–120 W/m°K) shows the diminishing trend. A theoretical model of both characteristics was proposed and validated with an error of ~ 4%.

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Data Availability

Additional data are available on reasonable request by email to the corresponding author.

Abbreviations

K 1 or K SIF :

Fracture toughness of designed composite material or Stress intensity factor of the material.

K 1C :

Critical value of stress intensity factor

r :

Distance from notch tip

α (β):

Function of crack length and specimen width

a :

Crack length of specimen

B :

Thickness of coupon

F :

Maximum load (stress)

θ :

Crack angle of specimen

σ c :

Fracture stress or crack stress

k C :

Thermal conductivity of composite specimen

k p :

Thermal conductivity of particulate metal powder

k m :

Thermal conductivity of material

V p :

Volume fraction of cobalt particulate

Ψ:

Spherical particulate

α p :

Thermal conductivity of particulate

α m :

Thermal conductivity of material

α d :

Thermal conductivity of composite volume fraction

V d :

Volume fraction of cobalt particulate

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Acknowledgments

The authors acknowledged the Advanced Research Lab for Tribology and Material Research Centre of Malaviya National Institute of Technology Jaipur for characterization facilities and other infrastructure support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, F.G.I.E.T., Raebareli, 229316, India

    Ashiwani Kumar

  2. Department of Mechanical Engineering, M.N.I.T., Jaipur, 302017, India

    Mukesh Kumar

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  1. Ashiwani Kumar
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  2. Mukesh Kumar
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AK contributed to conceptualization, methodology, experimentation, original draft preparation. MK contributed to reviewing and editing for the final draft preparation.

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Correspondence to Ashiwani Kumar.

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Kumar, A., Kumar, M. Fracture Toughness and Thermal Investigations of Al 7075 — Cobalt Particulates Reinforced Alloy Composites Prepared Using High Vacuum Casting Method for Gear Applications: Proposed Thermal Conductivity and Fracture Toughness Modeling. Inter Metalcast 17, 1970–1981 (2023). https://doi.org/10.1007/s40962-022-00901-x

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