Zhusheng Shi

TL;DR: In this paper, high-resolution transmission electron microscopy (HRTEM) with nanometer-scaled energy-dispersive X-ray (EDX) was employed to investigate the transformation mechanisms of the GP zone → η′ → ∞ precipitation sequence of AA7050, an Al-Zn-Mg-Cu alloy.

TL;DR: Using high-angle-annular-dark-field (HAADF) scanning-transmission-electron microscopy (STEM) images taken along the zone axes of [10 1 ¯ 0]η, [1 2 ¯ 10] η, and [0001] Δη illustrated the projected atomic-scale configurations of η-MgZn2 crystal as mentioned in this paper.

TL;DR: In this paper, a set of unified constitutive equations is presented that predict the asymmetric tension and compression creep behavior and recently observed double primary creep of pre-stretched/naturally aged aluminium-cooper-lithium alloy AA2050-T34.

TL;DR: In this article, a double primary creep feature has been observed in both as-quenched and pre-stretched/natural-aged alloys, in which an intermediate inverse creep stage with an increasing creep strain rate locates between the initial primary+transient steady-state creep stages and the second primary+second steady state creep stages.

TL;DR: In this article, the constitutive model is implemented in Ls-Dyna user subroutine to predict the formability of sheet metal in warm/hot forming processes, and the finite element (FE) result of strain distribution was compared with the experimental result from Argus system in terms of different strain paths.