A modified Arrhenius model for as-quenched Al-Mg-Si alloy considering the effect of cooling rate

Abstract

Purpose Accurate prediction of residual stress requires precise knowledge of the constitutive behavior of as-quenched material. This study aims to model the flow stress behavior for as-quenched Al-Mg-Si alloy. Design Methodology Approach In the present work, the flow behavior of as-quenched Al-Mg-Si alloy is studied by the hot compression tests at various temperatures (573–723 K), strain rates (0.1–1 s−1) and cooling rates (1–10 K/s). Flow stress behavior is then experimentally observed, and an Arrhenius model is used to predict the flow behavior. However, due to the fact that materials parameters and activation energy do not remain constant, the Arrhenius model has an unsatisfied prediction for the flow behavior. Considering the effects of temperatures, strain rates and cooling rates on constitutive behavior, a revised Arrhenius model is developed to describe the flow stress behavior. Findings The experimental results show that the flow stress increases by the increasing cooling rate, increasing strain state and decreasing temperature. In comparison to the experimental data, the revised Arrhenius model has an excellent prediction for as-quenched Al-Mg-Si alloy. Originality Value With the revised Arrhenius model, the flow behaviors at different quenching conditions can be obtained, which is an essential step to the residual stress prediction when the model is implemented in a finite element code, e.g. ABAQUS, in the future.

Construction of Dynamic Alloy Interfaces for Uniform Li Deposition in Li‐Metal Batteries

“…In which R is the ideal gas constant (R = 8.314 J mol −1 K −1 ), T is the sroom temperature (T = 298 K), D 0 is the frequency factor of the atom, and Q sd is the diffusion activation energy, respectively. [49,50] D 0 and Q sd of Ag, Au, Zn, and Hg atoms are shown in Table 1, respectively. [46] By Equation ( 2), the diffusion coefficients of Ag, Au, Zn, and Hg atom are calculated as 1.8 × 10 −31 , 1.0 × 10 −30 , 1.1 × 10 −15 , and 1.55 × 10 −3 mm 2 s −1 , respectively.…”

Construction of Dynamic Alloy Interface for Uniform Li Deposition in Li-Metal Batteries

“…The alloy diffusion theory can be explained with Darken equation in a binary A-B alloy: [45] [46,47] Where A and B refer to Li and M (Ag, Au, Zn and Hg), respectively.D Li and D M are intrinsic diffusion coefficient of Li and M, and x Li andx M are concentration of Li and M in this study. For the Li-rich solid solution phase, it hasx Li -100% andx M -0, thus the above equation can be simplified as D =D M (M=Ag, Au, Zn or Hg).D M can be calculated according to the diffusion equation: [48,49] In which, R is the ideal gas constant (R =8.314 J mol -1 K -1 ), T is the room temperature (T =298 K), D 0 is the frequency factor of the atom and Q sd is the diffusion activation energy, respectively. D o andQ sd of Ag, Au, Zn and Hg atoms are shown inTable 1 , respectively.…”