Biomedical Engineering Reference
In-Depth Information
for 48 h [29]. After the process, the powder was uniaxially pressed
(400 MPa) and sintered at 1000°C for 60 min. In the following
stage, the electrochemical etching was done using 1M H
3
PO
4
+ 2%
HF electrolyte at 10 V vs. ocp for 30 min [29]. Mechanical alloying
is a simple and cheap process for nanomaterials synthesis. In the
process, the mixture of microcrystalline pure elemental powders
(Fig. 9.62a) in the stoichiometric ratio was milled for 48 h to achieve
Ti-6Al-4V alloy composition. The XRD data in Fig. 9.62b clearly
shows that after milling, the Ti-Al-V mixture is ultra ine grained
(18 nm). After sintering (Fig. 9.62c), the structure is comparable
to the microcrystalline bulk alloy (Fig. 9.62d), but with deinitely
smaller grains (35 nm). Due to the structure, this material exhibits
quite different properties.
Figure 9.62
X-ray data for mixture of the microcrystalline Ti, Al, and V
powder before MA (a) after MA (b), after sintering (c), and for
comparison bulk microcrystalline Ti-6Al-4V alloy (d) [29].
