Development of intergranular thermal residual stresses in beryllium during cooling from processing temperatures

In-situ high-energy synchrotron X-ray diffraction study of micromechanical behavior of multiple phases in Ni47Ti44Nb9 shape memory alloy

“…5, this linearity can be attributed to the accommodative nature of the B19 0 phase, i.e., the ability of detwinning and selective martensitic transformation from the B2 phase. Therefore, it is concluded that the observed intergranular stresses accommodate the deformation behavior of either B19 0 grains or B2 grains [21][22][23]. The relationship between the lattice strain and applied stress represents the corresponding elastic modulus for different hkl planes due to the anisotropy of the crystal symmetry.…”

Twinning and de-twinning in beryllium during strain path changes

“…However, it would be a mistake to blindly apply this lattice spacing as the reference because the minority grain orientation will have a strong intergranular thermal residual stress (ITRS) due to constraints from the majority texture component. ITRS's have been determined experimentally for solid beryllium with random texture and used to validate an elastic self-consistent model [37] which assumes grains surrounded by an homogenous equivalent medium (HEM) with texture-weighted average thermal and mechanical properties. The same model has been used to calculate the ITRS's for the rolled material studied here-in, with the proper texture weighting.…”

“…8a-c shows the residual intergranular strains in the grains families whose (10.0), (00.2), and (10.1) poles are parallel to the straining direction as a function of plastic strain during the initial compression in the IP1 direction, the secondary compression in the TT direction, and the secondary straining in the IP2 direction, respectively. Recall that the lattice strains during the initial compression test have been offset to match the calculated intergranular thermal residual strains [37], while the lattice strains during the secondary tests are initially set to zero, and thus represent only evolution of the intergranular strains.…”

Neutron diffraction measurement of residual stresses, dislocation density and texture in Zr-bonded U-10Mo “mini” fuel foils and plates

“…Moreover, because these orientations represent the dominant grain orientation in the Zr, thermal residual stresses due to the anisotropic thermal expansion of Zr should be minimal in these grains [30,31].…”