described above these results were averaged and plotted against aging time resulting in the curves found in the attached drawing these curves are strongly indicative of superior strength characteristics of alloys according to the present invention in a separate series of experiments triplicate samples of experimental alloys 1 2 and 3 see table i above were first solutionized at 560 u00b0 c for one half hour followed immediately by cold water quenching then again at 160 u00b0 c u00b1 3 u00b0 c for 72 hours these samples were then subjected to standard tensile testing the results of which are summarized in table ii below table ii______________________________________ totalalloy sample uts ksi ys ksi elongation______________________________________1 sup c 1 67 99 62 38 6 21 sup c 2 68 68 58 36 10 71 sup c 3 69 30 60 33 6 3 68 66 average 60 36 average 7 7 average2 sup c 1 66 05 54 16 8 72 sup c 2 66 70 56 31 9 62 sup c 3 67 25 58 14 6 1 66 67 average 56 20 average 8 1 average3 1 79 00 69 82 10 33 2 78 52 70 31 9 53 3 77 65 72 25 4 9 78 39 average 70 79 average 8 2 average______________________________________ this invention sup c not this invention for comparison the tensile data of table ii confirm the superior strength characteristics of alloys according to the present invention as previously indicated by the rockwell hardness curves of the drawing in another separate series of experiments samples of experimental alloys 2 3 and 4 see table i above were first solutionized at 560 u00b0.