FIGURE 8 Microstructure of aluminum alloy (No. 2219) plus approximately 10 wt % beryllium (a) after normal casting and hot extrusion (yield strength 43.3 ksi, tensile elongation 1.7 percent), and (b) after RSP by melt spinning and hot extrusion (yield strength 43.3 ksi, tensile elongation 15 percent). From Vidoz et al.16 Reprinted with permission.

to take advantage of RSP; the intermetallic phases involved would be much too coarse and embrittling if they were to form during regular solidification. The strength retention exhibited by the RSP alloys at elevated temperatures is quite striking and is beginning to match or exceed the density-compensated strength of titanium alloys over the temperature range studied. Surely the time is now ripe to apply RSP to titanium alloys and possibly even to niobiumbase alloys.

The RSP aluminum alloys are also unusually resistant to corrosion, ac-

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