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Acta Metall Sin  2016, Vol. 52 Issue (3): 264-270    DOI: 10.11900/0412.1961.2015.00324
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RESEARCH ON THE TENSION-COMPRESSION ASYM-METRY OF AS-EXTRUDED ZK60 MAGNESIUM ALLOYS AT ROOM TEMPERATURE
Jinbao LIN(),Weijie REN,Xinyi WANG
School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
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Abstract  

Most wrought magnesium alloys exhibit a significant tension-compression asymmetry in yield and work hardening behaviors. To some extent, the widespread implementation of wrought magnesium alloys is hindered due to this disadvantage in some special conditions. In this work, in order to quantitatively analyze the effects of the deformation mechanisms on the tension-compression asymmetry of wrought magnesium alloys, the plastic deformation behavior of the as-extruded ZK60 magnesium alloy under uniaxial tension and compression at room temperature is investigated by the crystal plasticity simulation and experimental methods. The crystal plasticity constitutive model including slip and twinning mechanism is established by modifying the viscoplastic self-consistent (VPSC) model. The activation and evolution of basal slip, prismatic slip, pyramidal slip, {1012}<1011> tensile twinning and {1011}<1012> compression twinning are quantitatively studied during the process of uniaxial tension and compression deformation. Tensile-compression asymmetry of the as-extruded ZK60 alloy with fiber texture is analyzed based on the microscopic plastic deformation mechanism. The results show that the tension and compression twinning in the axial tension-compression process are difficult to active, basal slip is the main deformation mode in the early stage of deformation, but the orientation factor of basal slip is low and has a hard orientation resulting in higher yield stress. With the rotation of grains, the critical shear stress of basal slip reduces, stress continues increasing and prismatic slip becomes the main deformation mechanism, moreover, pyramidal <c+a> slip also has a high activity. At this stage, the strain hardening rate is low and the stress-strain curve is smooth. In the early stage of compression, the tensile twinning has a high activity due to its low critical shear stress (CRSS), leading to a lower yield stress. The tensile twinning gradually saturated after the strain reaches 6.0%. And then, the relative activity decreases rapidly and the hardening rate increases at the same time. Since a large number of twin boundaries hindered the movement of dislocations, slip is no longer the major mechanism. In the later stage, the compression twinning startes activation and its relative activity rises rapidly, the accumulated stress during plastic deformation could be released and then the hardening rate decreases. It can be seen that, the variation in the relative activity of each deformation mode during compression deformation is much more complex than that during tension. The yield asymmetry and different work hardening behavior could be attributed to the combined effects of the strong fiber texture and the polar nature of twinning.

Key words:  ZK60 magnesium alloy      viscoplastic self-consistent model      tension-compression asymmetry      twinning     
Received:  23 June 2015     
Fund: Supported by National Natural Science Foundation of China (No.51204117), Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi province and Shanxi Graduate Student Science and Technology Innovation Project (No.2015SY67)

Cite this article: 

Jinbao LIN,Weijie REN,Xinyi WANG. RESEARCH ON THE TENSION-COMPRESSION ASYM-METRY OF AS-EXTRUDED ZK60 MAGNESIUM ALLOYS AT ROOM TEMPERATURE. Acta Metall Sin, 2016, 52(3): 264-270.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00324     OR     https://www.ams.org.cn/EN/Y2016/V52/I3/264

Fig.1  Measured (0002) pole figure (a) and schematic of the tensile and compression samples (b) of as-extruded ZK60 magnesium alloy (ED--extrusion direction, TD--transverse direction)
Deformation mode Crystallographic type τ0 / MPa τ1 / MPa θ0 / MPa θ1 / MPa
Basal <a> 5 20 450 0
Prismatic <a> 185 80 300 0
Pyramidal <a> 310 150 800 0
Pyramidal <c+a> 205 300 4200 0
Tensile twin 85 0 0 330
Compressive twin 272 0 0 90
Table 1  Hardening parameters of ZK60 used for viscoplastic self-consistent (VPSC) simulation at 298 K
Fig.2  True stress-true strain curves of ZK60 magnesium alloy under uniaxial tensile and compression
Loading mode σs / MPa σb / MPa
Axial tension 287 369
Axial compression 125 459
Table 2  Yield strength σs and ultimate strength σb of ZK60 magnesium alloy under uniaxial tensile and compression
Fig.3  Simulated (0002) and pole figures of ZK60 alloy of initial texture (a), under uniaxial tensile (b~d) and compression (e~h) under different strains ε (The color scales indicate the pole figure density, ND--normal direction)
Fig.4  Relative activities of different slip and twinning systems during uniaxial tension (a) and compression (b) of ZK60 megnesium alloy with extruded texture
Fig.5  Morphologies of longitudinal section near the failure surface of the extruded ZK60 magnesium alloy after tension
(a) and compression (b) to fracture
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