The conventional wisdom for W-Ni-Fe heavy alloys has been that a nickel:iron weight ratio of about 7/3 yields optimum mechanical properties in these alloys. The work reported in this paper, however, clearly shows that alloys with a nickel:iron ratio of 8/2 yield mechanical properties superior to those with a 7/3 ratio. In some cases they also appear to improve ballistic properties. Quenching these alloys from above 1000°C shifts the optimum ratio closer to 9/1. The number of microstructural defects that develop during deformation of W-Ni-Fe alloys is shown to decrease dramatically as the nickel:iron ratio increases. Also shown is that after working 8/2 ratio alloys can be annealed back to unworked properties while alloys with 7/3 ratios cannot.
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