In this study, Mg-6Zn-(2Gd)-0.6Zr alloys were fabricated by the extrusion-shearing process. Dynamic compression experiments were conducted using a split Hopkinson pressure bar (SHPB) at strain rates from 800 to 2500 s−1. The influence of strain rates on microstructural evolution was systematically characterized. The results showed that the average grain sizes are refined from 17.4 µm in the Mg-6Zn-0.6Zr alloy to 3.6 µm in the Mg-6Zn-2Gd-0.6Zr alloy. The peak flow stresses of the two alloys increase monotonically with strain rates, exhibiting strain rate strengthening. The tensile twinning is the main deformation mechanism of dynamic compression. Meanwhile, most activated tensile twin variants follow Schmid's law, while twin nucleation with lower Schmid factors is due to strain accommodation between adjacent grains.
JayasathyakawinSRavichandranMBaskarN, et al.Mechanical properties and applications of Magnesium alloy-Review[J]. Mater Today Proc2020; 27: 909–913.
2.
QuDFDuXDWangF, et al.Breaking strength-ductility trade-off in magnesium alloy by semi-solid extrusion process: multi-slip activation in “Bimodal Grain”[J]. J Magnes Alloys2025; 13: 5652–5668.
3.
XuTYangYPengX, et al.Overview of advancement and development trend on magnesium alloy[J]. J Magnes Alloys2019; 7: 536–544.
4.
KumarDPhandenRKThakurL. A review on environment friendly and lightweight Magnesium-Based metal matrix composites and alloys[J]. Mater Today Proc2021; 38: 359–364.
5.
ViswanadhapalliBBupesh RajaVK. Application of magnesium alloys in automotive industry-a review[J]. Emerg Trends Comput Expert Technol2020; 35: 519–531.
6.
AgnewSRToméCNBrownDW, et al.Study of slip mechanisms in a magnesium alloy by neutron diffraction and modeling[J]. Scr Mater2003; 48: 1003–1008.
7.
WangJYLiNAlizadehR, et al.Effect of solute content and temperature on the deformation mechanisms and critical resolved shear stress in Mg-Al and Mg-Zn alloys[J]. Acta Mater2019; 170: 155–165.
8.
YuMCuiYWangJ, et al.Critical resolved shear stresses for slip and twinning in Mg-Y-Ca alloys and their effect on the ductility[J]. Int J Plast2023; 162: 103525.
9.
FrydrychKLiburaTKowalewskiZ, et al.On the role of slip, twinning and detwinning in magnesium alloy AZ31b sheet[J]. Mater Sci Eng A2021; 813: 141152.
10.
LiuCShanthrajPRobsonJD, et al.On the interaction of precipitates and tensile twins in magnesium alloys[J]. Acta Mater2019; 178: 146–162.
11.
LiLLiuWQiF, et al.Effects of deformation twins on microstructure evolution, mechanical properties and corrosion behaviors in magnesium alloys-A review[J]. J Magnes Alloys2022; 10: 2334–2353.
12.
KlimanelPPotzschA. Microstructure evolution under compressive plastic deformation of magnesium at different temperatures and strain rates[J]. Mater Sci Eng A2002; 324: 145–150.
13.
SunKXZengYYinDD, et al.Quantitative study on slip/twinning activity and theoretical critical shear strength of mg alloy with Y addition[J]. Mater Sci Eng A2020; 792: 139801.
14.
LivescuVCadyCMCerretaEK, et al.The high strain rate deformation behavior of high purity magnesium and AZ31B magnesium alloy[J]. Ess Read Magnes Technol2016: 375–380.
15.
XiangCXiaoZDingH, et al.Compressive properties and energy absorption characteristics of extruded Mg-Al-Ca-Mn alloy at various high strain rates[J]. Materials (Basel)2020; 14: 87.
16.
WangMXuXYWangHY, et al.Evolution of dislocation and twin densities in a Mg alloy at quasi-static and high strain rates[J]. Acta Mater2020; 201: 102–113.
17.
BiGXuZJiangJ, et al.High-Speed impact behavior and microstructure evolution of an extruded Mg-7Sn-5Zn-3Al Alloy[J]. J Mater Eng Perform2020; 29: 6427–6438.
18.
MalikAWangYHuanwuC, et al.Constitutive analysis, twinning, recrystallization, and crack in fine-grained ZK61 Mg alloy during high strain rate compression over a wide range of temperatures[J]. Mater Sci Eng A2020; 771: 138649.
19.
MalikAYangweiWHuanwuC, et al.Fracture behavior of twin induced ultra-fine grained ZK61 magnesium alloy under high strain rate compression[J]. J Mater Eng Perform2019; 8: 3475–3486.
20.
XiangCXiaoZDingH, et al.Compressive properties and energy absorption characteristics of extruded Mg-Al-Ca-Mn alloy at various high strain rates[J]. Mater2020; 14: 87.
21.
LiuYMaoPZhangF, et al.Effect of temperature on the anisotropy of AZ31 magnesium alloy rolling sheet under high strain rate deformation[J]. Philos Mag2018; 98: 1068–1086.
22.
LiLMuránskyOFlores-JohnsonEA, et al.Effects of strain rate on the microstructure evolution and mechanical response of magnesium alloy AZ31[J]. Mater Sci Eng A2017; 684: 37–46.
23.
TangWRLiuSMLiuZ, et al.Microstructure evolution and constitutive relation establishment of Mg–7Gd–5Y–1.2Nd–0.5Zr alloy under high strain rate after severe multi-directional deformation[J]. Mater Sci Eng A2021; 809: 140994.
24.
WangZYaoSCaoGS, et al.Dynamic compressive behaviour and microstructural evolution of extrusion-shear Mg–6Zn–1Cu–1Y–0.6Zr alloy[J]. Mater Sci Technol2019; 35: 1515–1525.
25.
WangZLiuBHuangS, et al.Microstructure and mechanical properties of extrusion ZC61 alloys under different dynamic compression loading directions[J]. Mater Today Commun2022; 30: 103123.
26.
HuangGHYinDDLuJW, et al.Microstructure, texture and mechanical properties evolution of extruded fine-grained Mg-Y sheets during annealing[J]. Mater Sci Eng A2018; 720: 24–35.
27.
HabibSAKhanASGnäupel-HeroldT, et al.Anisotropy, tension-compression asymmetry and texture evolution of a rare-earth-containing magnesium alloy sheet, ZEK100, at various strain rates and temperatures: experiments and modeling[J]. Int J Plast2017; 95: 163–190.
28.
PandeyAKabirianFHwangJH, et al.Mechanical responses and deformation mechanisms of an AZ31 Mg alloy sheet under dynamic and simple shear deformations[J]. Int J Plast2015; 68: 111–131.
29.
ShuaiDFengWZhiW, et al.Effect of Cu on microstructure, mechanical properties, and texture evolution of ZK60 alloy fabricated by hot extrusion−shearing process[J]. Trans Nonferrous Met Soc China2020; 30: 1511–1523.
30.
KorlaRChokshiAH. Strain-rate sensitivity and microstructural evolution in a Mg-Al-Zn alloy[J]. Scr Mate2010; 63: 913–916.
31.
AsgariHSzpunarJAOdeshiA, et al.Effect of grain size on high strain rate deformation of rolled Mg-4Y-3RE alloy in compression[J]. Mater Sci Eng A2015; 633: 92–102.
32.
KunduAFieldD. Influence of microstructural heterogeneity and plastic strain on geometrically necessary dislocation structure evolution in single-phase and two-phase alloys[J]. Mater Charact2020; 170: 110690.
33.
BarrettCDEl KadiriHTschoppMA. Breakdown of the Schmid law in homogeneous and heterogeneous nucleation events of slip and twinning in magnesium[J]. J Mech Phys Solids2012; 60: 2084–2099.
34.
GodetSJiangLLuoAA, et al.Use of Schmid factors to select tensile twin variants in extruded magnesium alloy tubes[J]. Scr Mate2006; 55: 1055–1058.
35.
LusterJMorrisMA. Compatibility of deformation in two-phase Ti-Al alloys: dependence on microstructure and orientation relationships[J]. J Mech Phys Solids1995; 26: 1745–1756.
36.
RenGZhouLHuangT, et al.Understanding of twin patterns in AZ31 magnesium alloy under quasi-in situ compression via combined analysis of Schmid factor and strain coordination factor[J]. Mater Charact2025; 227: 115313.
