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The tungsten heavy alloys with Ni-Al and Fe-Al additives were sintered by hot-press method at 1473 K for 1 h. It was found that the relativedensity of the W-Fe alloy could be increased evidently by addition of Al. However, the relative density of W- Ni-Al alloy with low content of Al was conversely decreased considerably compared with that of W-Ni alloy. The causes have been studied. The sinter ing experiments of Mo aloy and W-Mo alloys with 3 wt pct Fe-1.5 wt pct Al additives were also carried out under the same sintering condition of low temperature.Finally, W-Mo system FGM with density gradient was successfully fabricated.Its density changed gradually from 17.0x103 kg/m3 to 9.5x103 kg/m3 within the middfe 1.1 mm thickness range
The tungsten heavy alloys with Ni-Al and Fe-Al additives were sintered by hot-press method at 1473 K for 1 h. It was found that the relative intensity of the W-Fe alloy could be increased evidently by addition of Al. However, the relative density of W-Ni-Al alloy with low content of Al was conversely decreased compared with that of W-Ni alloy. The causes have been studied. The sinter ing experiments of Moaly and W-Mo alloys with 3 wt pct Fe-1.5 wt pct Al additives were also carried under the same sintering condition of low temperature. Finally, W-Mo system FGM with density gradient was successfully fabricated. Its density changed gradually from 17.0 × 103 kg / m3 to 9.5 × 103 kg / m3 within the middfe 1.1 mm thickness range