ANISOTROPY AND STRAIN RATE DEPENDENCE OF TENSILE PROPERTIES ON AZ31 MAGNESIUM ALLOY SHEETS AT HIGH TEMPERATURE

概要

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Tensile test have been performed to investigate anisotropy of strain and strength on AZ31 magnesium alloy sheet over a range of test temperatures (from room temperature to 220℃) and initial strain rates (10^<-4> to 10^<-1> s^<-1>). Tensile test specimens have been cut from a sheet 0.5mm thick at five different angles (the orientation:0,30,45,60,90 degrees) to the rolling direction, and some specimens were annealed at 400℃ for one hour to compare the characteristic with as-rolled one. Microstructure, texture-elongation relationships have been analyzed by EBSP technique. There is a significant anisotropy of failure strain and maximum stress at room temperature, regardless of as-rolled or annealed conditions. The anisotropy of strain was also kept at each high temperature, although the anisotropy of stress is not found at higher temperature, 220℃. All failure strain decreased with increasing strain rate at room temperature, and the strain rate dependence on maximum stress was slightly found at only room temperature. The failure strain at 150℃ has been showed the peak value at the strain rate of 10^<-2> order. In contrast with this, the failure strain at 220℃ is the lowest level at the strain rate of 10^<-3> order. Elongation-to-failure of as-rolled sample is similar tendency to it of annealed sample. It is due to the texture formation and occurrences of dynamic recrystallization or twin during deformation.
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