By M.T. Hutchings, P.J. Withers, T.M. Holden, Torben Lorentzen

Over the last 25 years the sphere of neutron diffraction for residual pressure characterization has grown drastically, and has matured from the level of trial demonstrations to supply a pragmatic device with common purposes in fabrics technology and engineering. whereas the literature at the topic has grown commensurately, it has additionally remained fragmented and scattered throughout quite a few journals and convention complaints. For the 1st time, this quantity provides a entire creation to emphasize size utilizing neutron diffraction. It discusses all facets of the procedure, from the elemental physics, different neutron resources and instrumentation, to a number of the suggestions for lattice pressure dimension and knowledge interpretation. those are illustrated via useful examples. This booklet represents a coherent unified therapy of the topic, written by way of recognized specialists. it's going to organize scholars, engineers, and different newbies for his or her first neutron diffraction experiments and supply specialists with a definitive reference paintings.

**Read or Download Introduction to the Characterization of Residual Stress by Neutron Diffraction PDF**

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**Additional info for Introduction to the Characterization of Residual Stress by Neutron Diffraction**

**Example text**

The rapid variations in cross-section occur at the Bragg cut-off wavelengths at which a given plane can no longer diffract. 9. 4. 2. In the reciprocal lattice representation of the case of diffraction from a random polycrystalline sample, all possible orientations of the grains are equally likely, so each reciprocal lattice point becomes an hkl sphere in reciprocal space, concentric about the origin. Depending on the crystal symmetry, some of these spheres may coincide, such as 333 and 115 for the face-centered cubic structure, since these have the same lattice plane spacings.

23) where Ri is the position vector of atom i, with average scattering length in real space, and the sum is over all the atoms i, j in the crystal. We may write Ri=li+ru. 24) where rua, rub, and ruc are real but not necessarily integer numbers. 30) below. 25) where i,j are now summed over the lattice points and u over the basis. 26) In general, the phases of the first term will vary randomly, and the summation will be zero. 21) that the exponential becomes unity, and the cross-section becomes nonzero.

5. 49). A few observations are worthwhile at this point. For a monatomic crystal with a basis of one atom at each real primitive lattice point, that is, for a Bravais lattice, there will be a finite Bragg intensity for all Q=Ghkl. The simplest example is a primitive, or simple, cubic structure with lattice constant a0, in which case the reciprocal lattice is again a simple cubic array of points, with spacing 2π/a0. 4c). The reciprocal lattice of the primitive real lattice is, in fact, bodycentered cubic (bcc).