Deakin University
Browse

File(s) under permanent embargo

Study on the role of stearic acid and ethylene-bis-stearamide on the mechanical alloying of a biomedical titanium based alloy

journal contribution
posted on 2010-04-17, 00:00 authored by Alireza Nouri, Peter HodgsonPeter Hodgson, Cui'E Wen
The present study examines the influence of different contents and types of process control agent (PCA), i.e., stearic acid (SA) and ethylene-bis-stearamide (EBS), on the microstructural evolution and characteristics of Ti-16Sn-4Nb (wt pct) alloy powders and bulk samples. The characterization of the powders and bulk samples was carried out by using chemical analysis, optical microscopy, scanning electron microscopy (SEM) combined with energy-dispersive spectrometry (EDS), and X-ray diffractometry. Results indicated that the powder recovered from the ball milling containers increased with increasing amounts of SA and EBS. Furthermore, adding more SA or EBS to the powder mixture resulted in a considerably smaller particle size, with a flaky-shaped morphology for the given ball milling time. Also, a slightly higher effectiveness was found for EBS when compared to SA. Meanwhile, the addition of both SA and EBS led to a delay in the alloy formation during mechanical alloying (MA) and caused contamination of the material with mainly carbon (C) and oxygen (O). An optimum amount of 1 wt pct PCA led to a good balance between cold welding and fracturing, and thus favored the formation of the titanium alloy. The microstructural observation of the bulk alloy showed a homogeneous distribution of fine Nb-rich ß-phase colonies within the α-Ti matrix with the addition of PCA less than 1 wt pct.

History

Journal

Metallurgical and materials transactions A – physical metallurgy and materials science

Volume

41

Issue

6

Pagination

1409 - 1420

Publisher

Springer New York LLC

Location

New York, N. Y.

ISSN

1073-5623

eISSN

1543-1940

Language

eng

Publication classification

C1 Refereed article in a scholarly journal; C Journal article

Copyright notice

2010, The Minerals, Metals & Materials Society and ASM International