Tungsten heavy alloys are being increasingly used in a variety of applications such as cutting tools, military defense, bullet, armor and etc. Mechanical properties such as hardness and strength of the alloy in these cases are very important. . The aim of this study is to examine the effect of swaging on the microstructure and mechanical properties of the 89.5W- 8Ni- 2.5Fe Tungsten heavy alloy. Tensile test results of as received alloy investigated 718 MPa yield strength, 842MPa ultimate tensile strength and 19.95% elongation. . The results showed that, by 35% swaging, the yield strength and ultimate tensile strength of the alloy rise up to1386 MPa and 1420 MPa, respectively and the % elongation to failure decreased to 9.69%. Investigation of metallographic analysis in longitudinal and cross-section indicated that tungsten grains became slightly elongated in the swaging or longitudinal direction. Hardness measurements reported that the hardness increases with increasing distance from the center of sample. Scanning electron micrographs of the fracture surfaces of sample showed that, in the swaged sample cleavage of tungsten grains and ductile matrix failure, are the dominant fracture modes. This investigation has described that swaging improve the mechanical properties of tungsten heavy alloy.

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