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Strain in metal carbides

1967; Elsevier BV; Volume: 13; Issue: 2 Linguagem: Inglês

10.1016/0022-5088(67)90180-4

1878-2728

Donald C. Gillies, Daniel Lewis,

Microstructure and Mechanical Properties of Steels

X-ray line broadening measurements have recently shown that ionic materials, such as alkali halides and metal oxides, may be heavily strained by ball-milling. This work has now been extended to some compounds containing atoms in interstitial sites. Those studied included some of the carbides of Ti, Zr, Ta, V, Nb, Mo and W. Ball-milling produced strain comparable to that observed after ball-milling the parent metal. In certain circumstances the strain can be removed by annealing. The induced strain has been compared with the free energy of formation as a parameter of bond strength. The presence of oxygen in the lattice causes some carbides to lose cubic symmetry and to deform more isotropically. Changes in lattice parameter were observed.