Abstract:The elevated temperature tensile properties of Mg₉₇Zn₁Y₂ magnesium alloy sheets, hot rolled at 390, 420 and 450 ℃ respectively, were tested in a temperature range from room temperature to 250 ℃ with a strain rate of 1.0×10⁻³ s⁻¹. The results show that the variations in yield strength for Mg₉₇Zn₁Y₂ magnesium alloy sheets hot rolled at 390 ℃ and 420 ℃ with temperature resemble each other due to their similar morphology of the chain-shaped strengthening phase. The yield strength maintains at a high level of 283 MPa before 200 ℃ and decreases significantly at 250 ℃. Despite of the fine lamellar structure of Mg₉₇Zn₁Y₂ magnesium alloy sheet hot rolled at 450 ℃, its yield strength decreases linearly owing to occurrence of the coarse grain, and drops to 239 MPa at 250 ℃. The elongation for all hot rolled Mg₉₇Zn₁Y₂ magnesium alloy sheets increases slightly with increasing testing temperature.

Key words: magnesium alloy; tensile properties; elevated temperature