High-temperature deformation mechanisms in a polycrystalline nickel-base superalloy studied by neutron diffraction and electron microscopy

Microstructural evolution of mechanically alloyed Ni-based alloys under high temperature oxidation

“…During heating treatments at elevated temperatures it is common the softening of work hardened materials [25]. For this reason, the oxidized samples were also tested by Vickers microhardness technique to determine the hardness behavior as a function of the microstructural evolution after thermal oxidation at high temperature.…”

Accounting for lattice coherency in a two-phase elastic-plastic self-consistent model for nickel-based superalloys

“…In situ neutron diffraction is used to quantify the evolution of lattice structure within the bulk of many polycrystalline metals. It has provided the foundation of numerous research on polycrystals with various crystalline structures [1][2][3][4][5][6][7][8] and phase components [9][10][11][12][13][14][15]. These in situ deformation studies have revealed the heterogeneous stress and strain accommodation within polycrystalline aggregates.…”

Stress distribution correlated with damage in duplex stainless steel studied by synchrotron diffraction during plastic necking

“…C 11 [GPa] C 22 [GPa] C 33 [GPa] C 12 [GPa] C 13 [GPa] C 23 [GPa] C 44 [GPa] On the out-necking area, the mesh with free structured tetrahedral element was used and the element seeds were assigned every 0.5 mm along the edge of the model. The same type of element was applied for the mesh of the in-necking area, but the distance between the element nodes was reduced to 0.05 mm in order to acquire a more accurate result along the necking zone.…”

“…The main advantage of the diffraction methods is that the measurements are performed selectively only for the crystallites contributing to the measured diffraction peak. When several phases are present in the sample, measurements of a separate diffraction peak allows for investigating the behaviour of each phase independently [15][16][17][18][19][20][21][22][23][24][25]. A comparison of the diffraction data with micromechanical models is very convenient for the study of elastoplastic properties at micro and macro scales.…”

“…To observe the mechanical behaviour inside both phases during the damage process, diffraction measurements combined with an in situ tensile test were performed [15][16][17][18][19][20][21][22][23][24][25]. The main advantage of the diffraction methods is that the measurements are performed selectively only for the crystallites contributing to the measured diffraction peak.…”