The structure of amorphous and nanocrystalline WFe alloys prepared by high-energy ball milling

The X-ray Diffraction Patterns of Bimetallic FexM100-x (M = Mo and W) Nanoclusters

“…It is interesting to note that the atomic level strain of the fcc Fe x W 100-x nanoclusters was somewhat larger than that of the Fe-W nanoclusters produced by mechanical attrition. 12,13 From this work and other works, 14,15 it was observed that the atomic level strain increased as the cluster size decreased. Considering that the cluster sizes of the bimetallic nanoclusters produced in this work are much smaller than those produced by mechanical attrition, it is likely that the atomic level strain of the fcc Fe x W 100-x nanoclusters produced in this work is somewhat larger than that of the Fe-W nanoclusters produced by mechanical attrition.…”

“…The first is a wellknown method by which a variety of nonequilibrium phase alloy nanoclusters can be produced in any composition, and thus has served as a general method of producing a variety of bimetallic nanoclusters. Studies on bimetallic nanoclusters produced by mechanical attrition include characterizations of the structure by using X-ray diffraction (XRD) spectrometery, [10][11][12][13][14][15][16][17] thermal properties by using differential scanning calorimeter (DSC), [14][15][16][17][18] magnetic properties by using superconducting quantum interference device (SQUID) and Mo ¨ssbauer spectrometery, [19][20][21][22][23] and size distribution by using transmission electron microscopy (TEM). 16,24 Although there exist many studies on nonequilibrium phase bimetallic nanoclusters produced by mechanical attrition, there are only a few studies on equilibrium phase bimetallic nanoclusters.…”

Synthesis of nanocrystalline carbide in tungsten alloy by mechanical alloying and annealing

“…As demand for higher and better mechanical properties increases in recent years, amorphous and nanocrystalline tungsten alloys have attracted enormous research attention. It has been demonstrated that the mechanical properties of tungsten alloys can be modified and improved by controlling their microstructures through mechanical alloying (MA) [1][2][3][4][5][6][7][8][9][10], alloying with Mo and Re [11], cyclic heat treatment [12,13], surface carburization [14,15], solid-state sintering [16] and oxide dispersion [5,17,18].…”

Mössbauer investigation of intermixing during ball milling ofFe0.3Cr0.7Caër1, Delcroix2, Shen3 et al. 1996Phys. Rev. B493130View full textAdd to dashboardCite

“…3 Amorphization by mechanical alloying is usually obtained in binary alloy systems exhibiting a large negative heat of mixing. 4 However, amorphization reactions and/or the formation of extended nanocrystalline solid solutions have been frequently observed by mechanical alloying of various alloy systems, such as Cu-Ag, 5 Cu-Ta, 6 Cu-Cr, 7 Cu-W, 8 Cu-V, 9 Fe-W, [10][11][12][13][14][15][16] Fe-Cu, [17][18][19][20] and Cu-Co, 21 which exhibit positive heats of mixing for the formation of amorphous phases or solid solutions. Thus mechanical alloying is believed to be a nonequilibrium process during which energy can be effectively stored to overcome the energy barrier for the alloy systems with positive heats of mixing.…”