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Single crystal cleavage of brittle materials

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Abstract

Cleavage of brittle single crystals is reviewed and the historical criteria for the phenomenon are critically examined. Previously proposed criteria, including those based on crystal structure (crystal growth planes, the planes bounding the unit cell, and planar atomic packing) and crystal properties (ionic charge of possible cleavage planes, bond density, elastic modulus, and surface free energy), are found to be applicable only to particular crystals or to isostructural groups, but each lacks universal application. It is concluded that the fracture toughness (K Ic) of the crystallographic planes is the most appropriate criterion. Measurements reveal that the ‘cleavage toughnesses’ of brittle single crystals are usually about 1 MPa m1/2 or less.

Measurements of the fracture toughnesses of brittle polycrystalline aggregates are then compared to the single crystal cleavage values in those instances where reliable results are available for the same crystal structures. Polycrystalline toughnesses are consistently higher, in part because of the lack of continuity of cleavage cracks through the polycrystalline aggregates. However, the increment of toughness increase is only 1–2 MPa m1/2. The role of grain texture or preferred crystal orientation is also addressed. It is concluded that polycrystalline aggregate toughnesses are often highly anisotropic and that the values for intensely oriented microstructures may approach those for single crystal cleavage.

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Authors and Affiliations

  1. Mackay School of Mines, University of Nevada-Reno, 89557, Reno, Nevada, U.S.A.

    Richard A. Schultz, Martin C. Jensen & Richard C. Bradt

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  1. Richard A. Schultz
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  2. Martin C. Jensen
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  3. Richard C. Bradt
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Schultz, R.A., Jensen, M.C. & Bradt, R.C. Single crystal cleavage of brittle materials. Int J Fract 65, 291–312 (1994). https://doi.org/10.1007/BF00012370

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