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<p>Titanium and its alloys are commonly used in prostheses, implants, and bioimplant applications due to their chemical properties, biocompatibility, ductility, and fracture behavior at low temperatures. However, they pose challenges in orthopedic issues, as the Ti-6Al-4V alloy’s higher Young’s modulus can cause bone density to decrease, leading to osteoporosis; this is known as the stress shielding effect, especially in older patients. To overcome this issue and to improve cell regeneration, titanium alloys with Gyroid structures, derived from triply periodic minimum surfaces (TPMSs), can be used. These alloys have a compressive strength similar to human cancellous bone, with samples showing varying compressive strengths according to the change in porosity. The printed Gyroid Ti-6Al-4V material, with a Gyroid lattice structure, was tested in three porosities and compared to human cancellous bone. The compression strength and flexural strength of the printed Ti-6Al-4V alloy were determined using the DMLS process, allowing for comparison with human cancellous bone for implant applications. The reasons for the increase in the hardness, compressive strength, and flexural strength of the Gyroid Ti-6Al-4V have been discussed, and the fractography studies for the compression and flexural tests for the Gyroid Ti-6Al-4V samples have been included.</p>

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Evaluation of Microhardness, Compression, and Flexural Strength for Gyroid Ti-6Al-4V with Different Porosities Fabricated by Direct Metal Laser Sintering Process for Orthopedic Application

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • L. Daniel Devaraj,
  • V. Srinivasan

摘要

Titanium and its alloys are commonly used in prostheses, implants, and bioimplant applications due to their chemical properties, biocompatibility, ductility, and fracture behavior at low temperatures. However, they pose challenges in orthopedic issues, as the Ti-6Al-4V alloy’s higher Young’s modulus can cause bone density to decrease, leading to osteoporosis; this is known as the stress shielding effect, especially in older patients. To overcome this issue and to improve cell regeneration, titanium alloys with Gyroid structures, derived from triply periodic minimum surfaces (TPMSs), can be used. These alloys have a compressive strength similar to human cancellous bone, with samples showing varying compressive strengths according to the change in porosity. The printed Gyroid Ti-6Al-4V material, with a Gyroid lattice structure, was tested in three porosities and compared to human cancellous bone. The compression strength and flexural strength of the printed Ti-6Al-4V alloy were determined using the DMLS process, allowing for comparison with human cancellous bone for implant applications. The reasons for the increase in the hardness, compressive strength, and flexural strength of the Gyroid Ti-6Al-4V have been discussed, and the fractography studies for the compression and flexural tests for the Gyroid Ti-6Al-4V samples have been included.