Structure evolution of EV31 Mg alloy

Small-angle X-ray scattering study of the early stages of precipitation in a Mg–Nd–Gd (EV31) alloy

“…This analysis was performed on the hypothesis that during the first stages of precipitation three-dimensional particles are formed in good agreement with the TEM evaluation of Ref. [5]. The Porod radius R p (see Ref.…”

“…The composition of the precipitates was calculated under the hypothesis that particles with a DO19 structure (␤ phase) are formed during the first stages of precipitation in agreement with the results given in Ref. [5]. Under this hypothesis, it is then possible to follow the evolution of volume fraction fV with increasing ageing time, by comparing their integrated intensity.…”

“…4 shows the evolution of the Guinier radius R G , the integrated intensity Q 0 and the ratio (Q 0 − Q * )/R 3 G at 150 • C and 200 • C. The scales on the right show the volume fraction and the number density of the scattering centres, evaluated according to Eqs. (4) and (5). The dashed lines through the experimental points are only a guide for the eye.…”

“…[5]. In the present work a quantitative description of the first stages of the precipitation sequence using in situ small-angle X-ray scattering (SAXS) is presented.…”

Advances in positron studies of age hardening in light alloys

“…After an initial work in 2003, the IFIMAT-LNESS collaboration has concentrated the attention on the commercial alloys WE43, WE54 (Mg-Y-Nd) and EV31(Mg-Gd-Nd). [13,20,21,24,25]. In the first of these studies [13] has been shown that the evolution of the positron lifetimes is strictly correlated with the changes in hardness, which are enhanced and accelerated by plastic deformation prior to heating at 250°C (see Figure 9).…”