Mohsin Talib Mohammed

Effect of thermo-mechanical processing on microstructure and electrochemical behavior of Ti–Nb–Zr–V new metastable β titanium biomedical alloy

Abstract The influence of thermo-mechanical processing (TMP) on the microstructure and the electrochemical behavior of new metastable β alloy Ti–20.6Nb–13.6Zr–0.5V (TNZV) was investigated. The TMP included hot working in below β transus, solution heat treatments at the same temperature and different cooling rates in addition to aging. Depending upon the TMP conditions, a wide range of microstructures with varying spatial distributions and morphologies of equiaxed/elongated β and β phases were attained, allowing for a wide range of electrochemical properties to be achieved. The corrosion behavior of the studied alloy was evaluated in a Ringers solution at 37 °C via open circuit potential–time and potentiodynamic polarization measurements.

Influence of thermomechanical processing on biomechanical compatibility and electrochemical behavior of new near beta alloy, Ti-20.6Nb-13.6Zr-0.5V.

This paper presents the results for the effect of different methods of thermomechanical processing on the mechanical properties and electrochemical behavior of metastable β alloy Ti-20.6Nb-13.6Zr-0.5V (TNZV). The thermomechanical processing included hot working, solution heat treatments at different temperatures, and cooling rates in addition to aging. The thermomechanical processing conditions used in the study resulted in attainment of a wide range of microstructures with varying spatial distributions and morphologies of elongated/equiaxed α, β phases, or martensite, as a result of which several tensile properties were achieved. Aging treatment led to an increase in hardness, elastic modulus, and tensile strength and a decrease in ductility (elongation). Electrochemical tests indicated that the TNZV alloy undergoes spontaneous passivation due to spontaneous formation of an oxide film in the environment of the human body. Because the air-cooled samples possessed high hardness and also a fine grain size, they showed a lower corrosion rate than the samples treated under other conditions.

Influence of thermo-mechanical processing on microstructure, mechanical properties and corrosion behavior of a new metastable β-titanium biomedical alloy

This paper presents the results on the influence of different thermo-mechanical processing (TMP) on the mechanical properties and electrochemical behavior of new metastable β-alloy Ti–20.6Nb–13.6Zr–0.5V (TNZV). TMP included hot working in below β-transus, solution heat treatments at same temperature in different cooling rates in addition to aging. Depending upon the TMP conditions, a wide range of microstructures with varying spatial distributions and morphologies of equiaxed/elongated α, β phases were attained, allowing for a wide range of mechanical and electrochemical properties to be achieved. The corrosion behavior of studied alloy was evaluated in Ringer’s solution at 37∘C using open-circuit potential-time and potentiodynamic polarization measurements.

Corrosion in Biomedical Grade Titanium Based Materials: A Review

Apart from ceramics, polymers, and composites, metallic materials rank distinguished in the field of bioma - terials. Recently, titanium based materials are attracting much interest as implantable materials because of their superior corrosion resistance, superior mechanical properties such as remarkably high specific strength, low elastic modulus, and the greatest biocompatibility compared to other competing biomaterials like stainless steel, Co-Cr alloys and nitinol alloys. Implantable Ti based materials must have high corrosion resistance to withstand the degradation which results from the reactions with the hostile body environment and does not result in adverse biological troubles in the body. At the same time, Ti materials must be stable and retain their properties for a long time reliably. This review discusses the important of Ti based materials as biomaterials from the point of view of corrosion science. The present article discusses various issues associated with biological corrosion of various categories of Ti materials which can be of use in different areas of clinical applications. The importance of creation of stable, compact and continuous oxide layers on the surface of Ti ma- terials has been strongly effective to combat corrosion in aggressive body fluid. In this review, extensive efforts have been made to accumulate the effect of thermal and thermomechanical processing on corrosion resistance of biomedical titanium alloys. This paper concentrates its interest mainly on the evolution, evaluation and development of effective microstructural features that can improve corrosion properties of bio grade titanium materials via using thermal and thermomechanical treatments.