Effect of temperature on the anisotropy of AZ31 magnesium alloy rolling sheet under high strain rate deformation

2018 ◽  
Vol 98 (12) ◽  
pp. 1068-1086 ◽  
Author(s):  
Yanyu Liu ◽  
Pingli Mao ◽  
Feng Zhang ◽  
Zheng Liu ◽  
Zhi Wang
Keyword(s):  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Az31 Magnesium Alloy ◽  
Effect Of Temperature ◽  
High Strain Rate Deformation

Research on Flow Stress of Magnesium Alloy Sheet under Warm and High Strain Rate Forming Condition

2011 ◽  
Vol 189-193 ◽  
pp. 2522-2525
Author(s):  
Zheng Hua Meng ◽  
Shang Yu Huang ◽  
Jian Hua Hu
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
Process Simulation ◽  
High Strain ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Rate Condition ◽  
Magnesium Alloy Sheet

Process simulation is a powerful tool to predict material behaviors under specified deformation conditions, so as to optimize the processing parameters. The equation for flow stress is important to numerically analyze. However, the reported constitutive equations of magnesium alloy are only suitable for processing simulation with strain rate between 0.001-1s-1. In this paper, the strain-stress behavior of AZ31 under warm and high strain rate (>103s-1) condition has been investigated by split Hopkinson pressure bar experiments at elevated temperature. The results show that the influence of the temperature on flow stress is more obvious than that of strain rate; the flow stress decreases with the rise of temperature at a certain strain rate. Based on Johnson-Cook model, the constitutive equation of AZ31 magnesium alloy under warm and high strain rate condition has been given out by fitting the experimental data, which can be applied in process simulation of AZ31 magnesium alloy sheet forming.

scholarly journals Fabrication of Strong and Ductile AZ31 Magnesium Alloy Using High Strain Rate Multiple Forging in a Wide Temperature Range

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 729 ◽  
Author(s):  
Yuanzhi Wu ◽  
Bin Deng ◽  
Tuo Ye ◽  
Zhicheng Nie ◽  
Xiao Liu
Keyword(s):  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Az31 Alloy ◽  
Az31 Magnesium Alloy ◽  
Basal Texture ◽  
Texture Characteristic ◽  
Temperature Range ◽  
Grain Sizes

High strain rate multiple forging (HSRMF) was successfully carried out on AZ31 magnesium alloy at a temperature range of 250–400 °C, and the microstructure, texture and mechanical properties were examined. Full recrystallized structure developed at a relatively lower strain due to the twining induced dynamic recrystallization (TDRX) mechanism, which is also responsible for the feasibility of HSRMF deformation at relative low temperature. The average grain sizes of the alloys high strain rate multiple forged (HSRMFed) to the accumulated strain of ∑Δε = 1.32 increased from 7.07 to 9.99 μm as the temperature ranged from 250 to 400 °C, i.e., the grain sizes of the HSRMFed alloy were less sensitive to temperature. The weakened basal texture characteristic of titled or double peak achieved was ascribed to the alteration of forging direction. The HSRMFed alloys demonstrated both excellent strength (UTS > 300 MPa) and good ductility (δ > 20%), which resulted from the combined effects of grain refinement and weakened basal texture. Therefore, HSRMF was an efficient technique to produce strong and ductile wrought AZ31 alloy.

Study of the Microstructure of AZ31B Magnesium Alloy under High Strain Rate Deformation

2011 ◽  
Vol 686 ◽  
pp. 325-331 ◽  
Author(s):  
Ping Li Mao ◽  
Zheng Liu ◽  
Chang Yi Wang ◽  
Zhi Wang
Keyword(s):  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Volume Fraction ◽  
Split Hopkinson Pressure Bar ◽  
Prismatic Slip ◽  
Hopkinson Pressure Bar ◽  
Az31b Magnesium Alloy ◽  
High Strain Rate Deformation

In order to investigate the microstructure evolution under high strain rate deformation of magnesium alloy, AZ31B magnesium alloy was impacted by Split Hopkinson Pressure Bar within the strain rates of 496s-1 to 2120s-1, then the specimens were observed by optical microscopy. The results show that when the strain rate are relatively low (496s-1-964s-1), the microstructure is predominated by high density of twinning, while increase the strain rate to 2120s-1 the volume fraction of twins is decreased. This implies that at relatively lower strain rate the deformation mechanism of AZ31B magnesium alloy under impact loading is twinning; increasing the strain rate the prismatic slip and pyramidal slip may be active besides twinning.

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