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<p>CoCrMo cast alloys are widely used in orthopedic implants such as hip and knee arthroplasties, as well as metal-on-metal articulations in hip prostheses. These alloys exhibit high strength, moderate hardness, good corrosion resistance, and excellent biocompatibility. One of the strengthening mechanisms in these alloys is the controlled formation of carbide precipitates through the addition of carbide-forming elements, which improves their mechanical properties. In this study, the influence of titanium addition on the microstructure and tensile strength of these alloys was investigated. Samples containing 0, 0.2, 0.4, 0.6, and 0.8&#xa0;wt.% titanium were cast under vacuum conditions. The microstructural analysis of these alloys was conducted using optical microscopy and scanning electron microscopy. Additionally, tensile testing was performed to assess the impact of the additive element on the alloys. Results show that by the addition of 0.8% Ti, YS and UTS increased from 423 to 517&#xa0;MPa and from 647 to 744&#xa0;MPa simultaneously. The ion release behavior of CoCrMo-xTi alloys was assessed, revealing that increased titanium content significantly reduces the release of Co, Cr, and Ni ions. This improvement in corrosion resistance suggested enhanced biocompatibility, making the alloy more suitable for biomedical applications.</p>

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The Effect of Titanium Addition on Microstructure and Mechanical Properties of CoCrMo Cast Alloys

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • F. Oukati Sadeq,
  • M. Esmailian,
  • Sh. Ahangarani

摘要

CoCrMo cast alloys are widely used in orthopedic implants such as hip and knee arthroplasties, as well as metal-on-metal articulations in hip prostheses. These alloys exhibit high strength, moderate hardness, good corrosion resistance, and excellent biocompatibility. One of the strengthening mechanisms in these alloys is the controlled formation of carbide precipitates through the addition of carbide-forming elements, which improves their mechanical properties. In this study, the influence of titanium addition on the microstructure and tensile strength of these alloys was investigated. Samples containing 0, 0.2, 0.4, 0.6, and 0.8 wt.% titanium were cast under vacuum conditions. The microstructural analysis of these alloys was conducted using optical microscopy and scanning electron microscopy. Additionally, tensile testing was performed to assess the impact of the additive element on the alloys. Results show that by the addition of 0.8% Ti, YS and UTS increased from 423 to 517 MPa and from 647 to 744 MPa simultaneously. The ion release behavior of CoCrMo-xTi alloys was assessed, revealing that increased titanium content significantly reduces the release of Co, Cr, and Ni ions. This improvement in corrosion resistance suggested enhanced biocompatibility, making the alloy more suitable for biomedical applications.