Effects of Ball Milling on β(Beta) Titanium Alloys for Biomedical Applications

Kumar, Harendra and Dey, Suhash Ranjan (2018) Effects of Ball Milling on β(Beta) Titanium Alloys for Biomedical Applications. Masters thesis, Indian Institute of Technology Hyderabad.

Text
Thesis_Mtech_MSME_4258.pdf - Submitted Version
Restricted to Repository staff only until August 2019.
Download (8MB) | Request a copy

Abstract

In this dissertation, we report the investigation on effects of high energy ball milling (HEBM) on mechanical, biocompatible, and microstructural properties of titanium alloys βTi-Nb, βTi-Nb-X (X=Sn, Zr) and βTi-Nb-Zr-X (X=Ta) in binary, ternary and quaternary system respectively for biomedical applications. In particular, the attention is HEBM which considerable interest for the production of functionally graded materials through change in morphology of powder as a result of serve plastics deformation for use of bone implants. Moreover, Titanium alloys has been fabricating by the powder route but open porosity is an inevitable part of powder metallurgy. As well-known fact, open porosity is good factor for bone implants as well as it can reduce the strength. In order to achieve the satisfactory properties, homogeneous mixture of titanium and its alloying elements is produced prior to consolidation. In this work, Ti25Nb, Ti25Nb6.25Zr, Ti25Nb6.25Sn, Ti18.75Nb6.25Zr, Ti18.75Nb6.25Sn (all in at%) and Ti29Nb13Ta4.6Zr (in wt.%) powder mixtures are produced by high energy ball milling for different optimized milling time on planetary ball mill (Pulverizate Fritsch 5) and also studied excessive milling which can lead toxic contamination. The milled powders are consolidated and sintered in a high vacuum furnace at temperature 1200 ºC for 2hrs with the heating and cooling rates of 10 ºC /min & 15 ºC/min, respectively. The morphology, microstructure and phase analysis investigated through field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD), while the Vicker Microhardness of milled sintered samples are found in increasing manner as function of milling for all the compositions. Low elastics modulus, low density, high biocompatible and high strength are perfect combination for bone implantation and our investigation to meet enable properties of biomaterial.

[error in script]

IITH Creators: