Biomedical Engineering Reference
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(a)
50
μ
m
(b)
1500
Silicon backing wafer
1000
{011}
β
{002}
β
500
0
30
35
40 45
2-theta (degrees)
50
55
60
Figure 9.4.
(a) Backscatter SEM image of LENS™ as-deposited TNZT alloy. (b) X-ray diffrac-
tion plot from the same as-deposited TNZT alloy indicating a single
phase. [Rajarshi Banerjee
et al.
Laser Deposited Ti-Nb-Zr-Ta Orthopedic Alloys
(J. Bio. Mater. Res., 78A (2), 2006), 298.]
β
the solution-treated condition have been reported to be 530 MPa and 590 MPa
respectively [1,27,30]. It has also been reported that the yield and tensile strength
of these alloys increase with oxygen content. Thus, with 0.46 wt% oxygen in the
alloy, the yield strength has been reported to be
1014 MPa in
the solution-treated condition [27]. Since the oxygen content in the LENS™
deposited TNZT alloys is not as high as 0.46 wt%, the increased strength in these
samples cannot be solely attributed to the oxygen content. Other possible reasons
for increased strength are the presence of the fi ne scale
∼
937 MPa and UTS
∼
ω
and
α
phases. However,
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