Corrosion fatigue behavior of a biocompatible ultrafine-grained niobium alloy in simulated body fluid

Use of Magnesium alloys as body implants are breaking into a new paradigm of biomedical engineering as they are biocompatible, biodegradable and have mechanical properties close to that of bone. Even though corrosion fatigue (CF) and stress corrosion cracking (SCC) failures are among the most common concerns for metallic implants, CF behaviour of magnesium alloys in physiological environments has received little attention. This article reports the CF results of a common cast magnesium alloy (AZ91D) in modified simulated body fluid (m-SBF). Results showed that there was a remarkable difference in fatigue strength of Mg alloys when tests were performed in m-SBF.

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Damage evaluation of HAp-coated porous titanium foam in simulated body fluid based on compression fatigue behavior

Journal of the Mechanical Behavior of Biomedical Materials ◽

10.1016/j.jmbbm.2021.104383 ◽

2021 ◽

Vol 117 ◽

pp. 104383

Author(s):

Munshi Mohammad Raihan ◽

Yuichi Otsuka ◽

Koudai Tsuchida ◽

Anchalee Manonukul ◽

Kiyoshi Ohnuma ◽

...

Keyword(s):

Simulated Body Fluid ◽

Body Fluid ◽

Fatigue Behavior ◽

Porous Titanium ◽

Damage Evaluation ◽

Titanium Foam

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Fatigue and Fretting Fatigue Behavior of Metallic Biomaterials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.618 ◽

2010 ◽

Vol 638-642 ◽

pp. 618-623

Author(s):

Norio Maruyama

Keyword(s):

Tensile Strength ◽

Fatigue Strength ◽

Simulated Body Fluid ◽

Body Fluid ◽

Fatigue Behavior ◽

Fretting Fatigue ◽

Test Method ◽

Fatigue Properties ◽

Metallic Biomaterials ◽

The Relationship

A fretting fatigue test method in a simulated body fluid is shown to evaluate fatigue properties of metallic materials which are used in the orthopaedics field. Next, fatigue/fretting fatigue behavior in a simulated body fluid is given for 316L stainless steel, Ti-6% Al-4% V alloy, pure Ti for industrial use and Co-Cr-Mo alloy. Finally, we discuss the relationship between the tensile strength and the fatigue strength/fretting fatigue strength of metallic biomaterials at 107 cycles in air and in a simulated body fluid. For all of the biomaterials tested, the fatigue strength at 107 cycles is similar in air and in a simulated body fluid. The fatigue strength is closely correlated to the tensile strength: The fatigue strength increases with increasing tensile strength. However, a correlation is not observed between the fretting fatigue strength at 107 cycles and the fatigue strength or the tensile strength.

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In Vitro Degradation of Ultrafine Grained Mg-Zn-Ca Alloy by High-Pressure Torsion in Simulated Body Fluid

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.504 ◽

2012 ◽

Vol 706-709 ◽

pp. 504-509 ◽

Cited By ~ 2

Author(s):

Shao Kang Guan ◽

Zhen Wei Ren ◽

Jun Heng Gao ◽

Yu Feng Sun ◽

Shi Jie Zhu ◽

...

Keyword(s):

High Pressure ◽

Simulated Body Fluid ◽

Body Fluid ◽

High Pressure Torsion ◽

Cast Alloy ◽

Mg Alloy ◽

Second Phase ◽

Ultrafine Grained ◽

Degradation Properties

In this paper the in vitro degradation of ultrafine grained (UFG) Mg-Zn-Ca alloy produced by HPT was investigated by electrochemical measurements and immersion tests in SBF. It was found that UFG Mg alloy had better degradation properties and also higher microhardness value than as-cast Mg alloy. The corrosion current density of UFG Mg alloy decreased by about two orders of magnitude, compared with that of as-cast alloy. Through electrochemical impedance spectroscopy (EIS) test，UFG Mg alloy showed a higher charge transfer resistance value. In immersion test, UFG Mg alloy in SBF exhibited more uniform corrosion and lower degradation rate (0.0763 mm/yr) than as-cast alloy. The degradation properties were related with the microstructure evolution, namely the grain refinement and redistribution of second phase. Keywords: Mg-Zn-Ca alloy; High-pressure torsion (HPT); Degradation behavior; Simulated body fluid (SBF); Microhardness

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