Amorphization and thermal stability of mechanical alloyed W–Ni–Fe

摘要: Abstract The tungsten heavy alloys with the composition of 80.7W–13.2Ni–6.1Fe (at.%) from elemental powders W, Ni and Fe were mechanically alloyed (MA-ed). A W–Ni base amorphous phase imbedded remnant nano-crystalline W grain size 10–20 nm was achieved by suitable MA technology. Phase transition during thermal stability investigated using a combination XRD, TEM, DTA DSC analysis. (Fe) first dissolves in crystalline milling, then amorphization (Ni, Fe) supersaturated solid solution occurs after milling for 20 h. volume fraction as-milled increases extending time up to 60 h, average is proximately 63W–37Ni (Fe). Different transformations occur milled 20 60 h subsequent annealing. For besides relaxation crystal defects lattice distortion, crystallization precipitation NiW compound are confirmed When temperature increasing above 1100 °C, partially decompose through peritectoid reaction. primary melting temperatures obtained both decrease nearly 200 °C compared that un-milled powder mixture.