Effect of Tungsten Composition on the Mechanical Properties on Thew-Ni-Fe Heavy Alloy

摘要

The ductility and strength of W-Ni-Fe composites over a wide range of volume % W was investigated at room temperatures. A series of composites was prepared (40% W to 95% W), sintered in the presence of the liquid phase and tested in tension. The sources of strength and ductility of the W-Ni-Fe composite was determined as related to the measured dihedral angle, mean particle diameter, tungsten mean free path, tungsten contiguity and volume % W. Similar stress-strain curves were obtained for all specimens tested which showed liquid phase sintered microstructure. These test results indicate that the volume % has very little effect upon the composite strength. For W-Ni-Fe composites where the tungsten mean free path is greater than the measured particle diameter (approximately 85% to 96% W), the maximum strain and maximum stress at necking dropped off rapidly. (Author)