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<p>Magnesium alloys, as they are lighter than aluminium, are widely used in various technical fields, particularly for creating complex designs through gravity die casting. However, when used in composites, performance variations often arise due to casting defects. To address this, a two-step stir technique has been proposed to develop a hybrid AZ91 alloy composite containing 3 wt% boron nitride (BN) and varying wt% of titanium dioxide (TiO<sub>2</sub>) nanoparticles. This method minimizes oxide formation due to the inert nature of the added materials, resulting in lower porosity and improved composite properties. The effects of the casting process and hybrid reinforcement on microstructure, density, void distribution, impact toughness, hardness, tensile strength, and elongation were investigated across four trials for each fabricated composite, with a test significance level of 4–5%. The microstructural analysis results show a better particle distribution in the composite. The composite contains 3wt% BN and 5 wt% of TiO<sub>2</sub>, with an optimum density of 1.917 g/cc. The porosity percentage has been reduced to 0.78%. It exhibits a maximum impact toughness of 17.1 ± 0.5 J/mm<sup>2</sup>, a significant increase in hardness to 87 ± 3 HV, and a good tensile performance of 247 ± 3 MPa. However, there is a decreased elongation of 4.7±0.1%.</p>

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Hybrid Reinforcement Actions on Microstructural, Physical and Mechanical Properties of Magnesium Alloy Composite by Two-Step Stir Casting Process

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • R. Venkatesh,
  • Aman Sharma,
  • K. Karthik,
  • Rakesh Kumar,
  • Pradeep Kumar Khatokar Vivekananda,
  • Mohanavel Vinayagam,
  • Manzoore Elahi M. Soudagar,
  • Sami Al Obaid,
  • Sulaiman Ali Alharbi

摘要

Magnesium alloys, as they are lighter than aluminium, are widely used in various technical fields, particularly for creating complex designs through gravity die casting. However, when used in composites, performance variations often arise due to casting defects. To address this, a two-step stir technique has been proposed to develop a hybrid AZ91 alloy composite containing 3 wt% boron nitride (BN) and varying wt% of titanium dioxide (TiO2) nanoparticles. This method minimizes oxide formation due to the inert nature of the added materials, resulting in lower porosity and improved composite properties. The effects of the casting process and hybrid reinforcement on microstructure, density, void distribution, impact toughness, hardness, tensile strength, and elongation were investigated across four trials for each fabricated composite, with a test significance level of 4–5%. The microstructural analysis results show a better particle distribution in the composite. The composite contains 3wt% BN and 5 wt% of TiO2, with an optimum density of 1.917 g/cc. The porosity percentage has been reduced to 0.78%. It exhibits a maximum impact toughness of 17.1 ± 0.5 J/mm2, a significant increase in hardness to 87 ± 3 HV, and a good tensile performance of 247 ± 3 MPa. However, there is a decreased elongation of 4.7±0.1%.