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· In addition to maintaining
a high yield
stress, the alloy was required to have a creep
strain of no more than 0.001
after 20,000 hours hot life, and exhibit a high room temperature UTS
after this treatment.
· The RR58 Hiduminium alloy selected
has the composition:
Al - (1.8 to 2.7) wt % Cu - (1.2 to 1.8) wt % Mg -
(0.15 to 0.25) wt % Si - (0.9 to 1.4) wt % Fe - (0.8 to 1.4) wt % Ni - 0.2 wt
% Mn - 0.2 wt % Ti
· This
material is age hardened, and develops the microstructure shown (x 540). The
precipitates of FeNiAl9 control the final grain
size to about
0.1 mm.
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