Abstract:In this paper,93W-5Ni-2Fe tungsten heavy alloy prepared by powder metallurgy method were tested at
1 000,1 100,1 200,1 300 and 1 400 ℃,the high temperature mechanical properties were investigated respectively.
The fracture analysis and the developing principles of fracture mechanism were studied. The results show when
the elevating temperature is 1 000- 1 400 ℃ ,mechanical properties of 93W- 5Ni- 2Fe alloy,such as tensile
strength,elongation,reduction of area and Young's module get worsedramatically. Material becomes brittle,transgranular
fracturecan be hardly found,binder phase tear and inter-facial fracture between tungsten grain and binder
phases are domestic fracture mode.