DSpace JSPUI

A Comprehensive Study Has Been Carried Out To Bring Out The Roles Of Alloying Elements Like Nb, Zr And Ta And Those Of The Processing Parameters On The Microstructural Characteristics, Biocompatibility, Corrosion, Wear And Other Mechanical Properties Of The Ti Based Alloys For Biomedical Applications. Also, The Role Of Boron To Improve The Wear Resistance Of The Alloy As Well As Its Influence On Other Properties Of The Alloy Was Extensively Investigated. For This Purpose, Two Alloys Were Selected. One Was ‘Near-􀈕’ Ti-13Zr-13Nb Or TZN Alloy And Another Was ‘Metastable-􀈕’ Ti-35Nb-5.7Ta-7.2Zr Or TNTZ Alloy (All Composition In Wt %). Increasing The 􀈕 Stabilizing Alloying Element In The Alloy Changes It From Near-􀈕 TZN Alloy To Metastable- 􀈕 TNTZ Alloy. Depending On The Heat Treatment Conditions, The Microstructure Of The Heat Treated TZN Alloy Mainly Consisted Of 􀄮, 􀈕 And Martensite And That Of TNTZ Alloy Consisted Of Equiaxed 􀈕 Grains With A Very Small Amount 􀈦 Or 􀄮 Phase. Addition Of 0.5% B To TZN Or TNTZ Alloy Resulted In The Formation Of Dispersed Precipitates Of Acicular Titanium Boride Particles With Orthorhombic B27 Structure And It Enhanced The Growth Of 􀄮 Particles In TZN Alloy. In Case Of TZN Alloy, The Presence 􀄮, 􀈕 And Martensite Phases, Their Volume Fraction And Particularly The Morphology Of The 􀄮 Phase Have Substantial Influence On The Mechanical Properties, Wear Behaviour And Corrosion Properties Of The Material. Presence Of 􀈦 Or 􀄮 Phase In TNTZ Alloy Changes The Behaviour Of The Material Including Mechanical Properties, Wear Resistance And Corrosion Behaviour. Addition Of Boron Modified The Microstructure And Affected The Mechanical Properties Of Both TZN And TNTZ Alloy. The Wear And Corrosion Properties Are Also Affected By The Precipitated Phase. Cell Viability Is Influenced By The Substrate Material And Its Surface Roughness. Results Of The Work Suggest That Among The Alloys Studied In The Present Work, Aged TZN Alloy Which Was Deformed And Solution Treated At 800o C Followed By Water Quenching Is A Promising Candidate For Implant Material. Boron Did Not Improve The Wear Properties Of The Alloy And It Deteriorated Hardness, Elastic Modulus, Ductility And Corrosion Resistance. Keywords: ‘Near-􀈕’ And ‘Metastable-􀈕’ Ti-Alloys, Boron, Microstructure, Elastic Modulus, Mechanical Behaviour, Wear, Corrosion And Biocompatibility. .