Abstract
The E3 residual stress neutron diffractometer operated at Helmholtz-Zentrum Berlin (HZB) is designed for studies in material science and engineering applications. Recent upgrade activities have made the instrument faster and more adaptable to different types of measurement. Thus, E3 has become more attractive to a broad user community, including industry, and increased substantially its scientific output.
Highlights
Neutron di raction provides an attractive tool for investigations in fundamental research as well as for industrial applications
Utilizing a di ractometer allows the study of lattice strains, phase transitions and preferred crystallographic orientations
Residual stress analysis (RSA) with angular-dispersive neutron di raction is usually restricted to measurements of a single lattice re ection, but for many engineering applications this information is su cient (Staron, 2008)
Summary
Neutron di raction provides an attractive tool for investigations in fundamental research as well as for industrial applications. The large penetration depth within the bulk and the strong scattering power of many materials are advantageous features to probe crystallographic properties non-destructively with neutrons. Utilizing a di ractometer allows the study of lattice strains, phase transitions and preferred crystallographic orientations. The neutron wavelength λ , applied for such investigations, is of the order of the interatomic distances dhkl. For example, coherent elastic neutron scattering at angles of 2θ hkl will occur if Bragg’s law is ful lled: nλ = 2dhklsinθ hkl (1). Where the hkl Miller indices denote the selected lattice plane of the crystal and n=1,2,3. Is the order of the measured lattice re ection, i.e. the Bragg peak Where the hkl Miller indices denote the selected lattice plane of the crystal and n=1,2,3. . . is the order of the measured lattice re ection, i.e. the Bragg peak
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