Tensile Properties and Fracture Behaviour of Biodegradable Iron⁻Manganese Scaffolds Produced by Powder Sintering.

A Dehghan-Manshadi,D.H Stjohn,M.S Dargusch

doi:10.3390/ma12101572

Abstract

Powder sintering at 1200 °C for 180 min was used to produce Fe–Mn based alloys with tensile properties and an elastic modulus suitable for biodegradable implant applications. The effect of the addition of manganese on the microstructure, tensile properties and fracture behaviour of the Fe–Mn alloys was investigated. The Fe–35Mn alloy with a microstructure dominated by the Austenite phase showed the best set of tensile properties, including ultimate tensile strength and Young’s modulus, suitable for orthopaedic implant applications. The fracture surface of the Fe–35Mn alloy showed signs of complex multimode fracture behaviour, consisting of interconnected pores and large segments with signs of ductile fracture, including the presence of dimples as well as micro-voids.

Highlights

The development of metallic materials for surgical implants has been the focus of a significant number of research activities in recent years
The development of biodegradable implants provides an alternative to implants fabricated from Ti, Co and stainless steel
Synthetic biodegradable polymers with good biocompatibility and degradability are the most common materials commercially available [7,8]. The advantage of these polymer materials is that the degradability rate can be tailored by molecular weight design [9]. These materials suffer from poor mechanical properties, which challenges their suitability for hard tissue engineering, including applications such as scaffolds for bone replacement

Summary

Introduction

The development of metallic materials for surgical implants has been the focus of a significant number of research activities in recent years. Synthetic biodegradable polymers with good biocompatibility and degradability are the most common materials commercially available [7,8]. The advantage of these polymer materials is that the degradability rate can be tailored by molecular weight design [9]. These materials suffer from poor mechanical properties, which challenges their suitability for hard tissue engineering, including applications such as scaffolds for bone replacement

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Methods

Results