An impact test was carried out to evaluate the effects of notch shape and tungsten content on the impact absorbed energy of Iiquid phase sintered W-Ni-Fe heavy alloys.
The microstructure of the alloys consists of rounded, single crystal tungsten grains in a matrix phase. Several samples of different mechanical properties, and of different notch shapes and tungsten contents of the test pieces were tested, and, as a result the fractography and the fracture patterns were observed by using scarring electron microscopes.
It was confirmed that the notch shape influenced on the impact absorbed energy and the bonding force of the interface between the matrix phase and the tungsten grain.
By considering these characteristics, a fracture model of W-Ni-Fe heavy alloy was proposed after the discussion of fracture mechanism