Premium
Temperature Effect on Strain Hardening Behaviors of As‐Extruded Binary Magnesium Alloys
Author(s) -
Zhao Chaoyue,
Chen Xianhua,
Tu Teng,
Wang Ziyi,
Yuan Yuan,
Pan Fusheng
Publication year - 2021
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202001104
Subject(s) - materials science , metallurgy , hardening (computing) , strain hardening exponent , dynamic strain aging , atmospheric temperature range , work hardening , grain boundary , magnesium , solid solution strengthening , ultimate tensile strength , composite material , thermodynamics , microstructure , physics , layer (electronics)
Herein, the effect of temperature on strain‐hardening behaviors of binary Mg‐3X (X = Al, Zn, Sn, Y, and Gd) alloys were investigated. Uniaxial tensile tests are carried out at room temperature (RT), 150 and 250 °C. These samples are composed of α‐Mg phase and second‐phase precipitates which exist only in Mg‐3Sn and Mg‐3Gd. In the temperature range of this work, dislocation movement dominates the plastic deformation process and strain‐hardening ability decreases with rising temperature due to stronger dynamic recovery. The amount of forest dislocations decreases at elevated temperature under the influence of dynamic recovery and grain boundary sliding (GBS), thus strain‐hardening ability is seriously weakened. However, a periodic serrated hardening curve appears in Mg‐3Y and Mg‐3Gd alloys at elevated temperature, which results from dynamic strain aging (DSA) effect. Moreover, with increasing deformation temperature, the decline scope of strain‐hardening ability of Mg‐3Y and Mg‐3Gd is significantly lesser than non‐RE binary alloys. The differences in strain‐hardening behavior of these alloys at various temperatures are mainly related to diffusion coefficients of alloying elements in α‐Mg matrix.