TWIP-assisted Zr alloys for medical applications: Design strategy, mechanical properties and first biocompatibility assessment - Institut de Chimie du CNRS Access content directly
Journal Articles Journal of Materials Science and Technology Year : 2024

TWIP-assisted Zr alloys for medical applications: Design strategy, mechanical properties and first biocompatibility assessment

Abstract

This study proposes a novel strategy for the design of a new family of metastable Zr alloys. These alloys offer improved mechanical properties for implantss, particularly in the applications where conventional stainless steels and Co-Cr alloys are currently used but lack suitability. The design approach is based on the controlled twinninginduced plasticity (TWIP) effect, significantly enhancing the ductility and strainhardenability of the Zr alloys. In order to draw a "blueprint" for compositional design of biomedical TWIP (Bio-TWIP) Zr alloys-using only non-toxic elements-the study combines d-electron phase stability calculations (specifically bond order (Bo) and mean d-orbital energy (Md)) with systematic experimental screening of active deformation mechanisms within the Zr-Nb-Sn alloy system. This research aids in accurately identify of the TWIP line, which signifies the mechanism shift between TWIP and classic slip as the primary deformation mechanism. To demonstrate the efficacy of the TWIP mechanism in enhancing mechanical properties, three alloy compositions-Zr-12Nb-2Sn, Zr-13Nb-1Sn, and Zr-14Nb-3Sn-are selected.. Results indicate that the TWIP mechanism leads to excellent average strain-hardening rates (~3.2 GPa) and uniform elongation of ~20% in Zr-12Nb-2Sn, which displays both {332}<113> mechanical twinning and dislocation slip as the primary deformation mechanisms. Conversely, Zr-14Nb-3Sn exhibits the typical mechanical properties found in stable BCC alloys, characterized by the sole occurrence of dislocation slip. Cell viability tests confirm the superior biocompatibility of Zr-Nb-based alloys with deformation twins on the surface, in line with existing literature.. Based on the whole set of results, a comprehensive design diagram is proposed.
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Year Month Jours
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Tuesday, December 10, 2024
Embargoed file
Tuesday, December 10, 2024
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Dates and versions

hal-04333994 , version 1 (10-12-2023)

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Junhui Tang, Hongtao Yang, Bingnan Qian, Yufeng Zheng, Philippe Vermaut, et al.. TWIP-assisted Zr alloys for medical applications: Design strategy, mechanical properties and first biocompatibility assessment. Journal of Materials Science and Technology, 2024, 184, pp.32-42. ⟨10.1016/J.JMST.2023.09.051⟩. ⟨hal-04333994⟩
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