Effect of Applied Stress on &alpha;<SUP>&prime;&prime;</SUP> Precipitation in Fe-N Alloys

Energy consideration for variant selection in precipitation on dislocations

“…By applying two-step aging treatments with and without external stresses to Fe±N and Al±Cu single crystals, Mori and Horie [5], Eto et al [6] and Tanaka et al [7] have concluded that the stress plays a dominant role in the early stages of precipitation to change the crystal structure.…”

Stress-assisted nucleation and growth of γ″ and γ′ precipitates in a Cu–1.2 wt%Be–0.1 wt%Co alloy aged at 320°C

“…It is widely known that application of an elastic stress during the ageing process of many age-hardenable alloy systems significantly affects the resulting microstructures, in particular the distribution of strengthening precipitates [1][2][3][4][5][6][7][8][9][10]. Particularly, for Al-Cu alloys, the effect of directional stress on the orientation distribution of precipitate structures has been invetigated extensively [2,5,7,9].…”

Effect of external stress on discontinuous precipitation on {100} planes in Cu–5.7 wt% Ag single crystals

“…As an explanation has already been given in a number of similar studies [3,6,8,9], if the disc-shaped aggregate is regarded as a disc-shaped coherent precipitate, such as a GP zone in an Al-Cu alloy, the cause of the formation of disc-shaped aggregates Effect of external stress in Cu-5.7 wt% Ag parallel to particular {100} under external stress (figure 2) is understood through the interaction energy due to the presence of positive misfit strain " ij (stress-free transformation strain) between an aggregate and an external stress. If " ij for the aggregate, lying parallel to (001), is assumed to have components of " 33 and " 11 ¼ " 22 from symmetry consideration, the interaction energies per unit volume of the aggregates lying perpendicular to and parallel respectively to the [001] stress axis ÁE ?…”