Overview no. 5: Fracture-mechanism maps for materials which cleave: F.C.C., B.C.C. and H.C.P. metals and ceramics

Abstract

This is the second of two papers on fracture-mechanism maps. In it, a large body of published data is combined with our own observations to construct maps for a number of polycrystalline metals and ceramics: the refractory b.c.c. metals: tungsten, molybdenum, tantalum, niobium and chromium: the h.c.p. metals and alloys: magnesium, Magnox-AL80, Magnox-ZR55, beryllium and rhenium; the high temperature ceramics: MgO, Al 2O 3, BeO, UO 2, SiC, Si 3N 4; the alkali halides NaCl, KCl, LiF, CaF 2; ice, H 2O; and the f.c.c. metal, irridium. Certain generalisations about fracture behaviour can be drawn from comparisons of the maps.