Lattice strain evolution in IMI 834 under applied stress

Evolution of a laser shock peened residual stress field locally with foreign object damage and subsequent fatigue crack growth

“…In all cases single peak analysis was carried out using the diffraction peak from the Ti-α phase. Although the peak has a much lower intensity than peak it was chosen because it displays low intergranular strain [36], and hence is representative of the macrostress. Elastic strain was obtained in the usual manner relative to a strain-free lattice spacing, d 0 .…”

Influence of directional strength-to-stiffness on the elastic–plastic transition of fcc polycrystals under uniaxial tensile loading

“…Numerous researchers have measured lattice strains under in situ loading using neutron diffraction for fcc [9][10][11][12][13][14][15][16], body-centered cubic (bcc) [17][18][19][20] and hexagonal close-packed (hcp) [21][22][23][24][25][26] polycrystalline metals. These neutron diffraction measurements have typically been limited to a few {h k l} lattice planes parallel and perpendicular to the specimen loading direction.…”

“…These neutron diffraction measurements have typically been limited to a few {h k l} lattice planes parallel and perpendicular to the specimen loading direction. The neutron diffraction measurements were used to validate various polycrystal deformation models, such as the Taylor [9][10][11], self-consistent [12][13][14][15][16][17][18][19][21][22][23][24][25][26][27] and finite element models [19,20].…”

In Situ Observation of Strain Evolution in Cp-Ti Over Multiple Length Scales

“…During elastic loading (data collected at 30, 140, 195 MPa), a qualitative estimate of the anisotropy measured for the individual grains can be ascertained by the change in slope of the individual trend lines displayed in Figure 10. Albeit at a different length scale, Daymond and Bonner [9] observed a similar behavior, reporting low levels of elastic anisotropy in the Ti alloy IMI838 during uniaxial tensile loading. As yielding is encountered (data collected at 230 and 285 MPa), localized plastic deformation is established.…”

“…[7,8] In addition, neutron diffraction has been used to assess the development of elastic and plastic anisotropy during evolution of lattice strain in the Ti alloy IMI834. [9] Supplementary to bulk diffraction methods, synchrotron micro-XRD is emerging as a unique tool for the direct observation of plastic deformation with subgrain spatial resolution. Experimental techniques using a highly focused submicron incident X-ray beam, employing polychromatic diffraction, have been developed to measure deviatoric (shear) strain and crystal orientation with subgrain resolution.…”