For a higher speed aircraft aluminium alloy is not suitable since it does not
retain good mechanical properties at the higher temperatures. For such
aircraft titanium has to be considered, despite its higher costs. Unlike
aluminium, titanium does make good welds. Table 20.6 shows possible alloys
and their properties.
Table 20.6 Properties of titanium alloys
Alloy
composition
(%)
90 Ti, 8 Al, 1 Mo, 1 V
90 Ti, 6 Al, 4 V
Condition
Annealed
Solution treated
and aged
Annealed
Solution treated
and aged
Yield
20°C
970
1200
940
1100
stress
(MN
300°C
630
780
660
710
r
m
2
or
400°C
570
710
580
630
MPa)
500°C
520
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