温度和应变速率对ZK60镁合金压缩变形行为的影响

在应变量为0.6（ε=0.6）、不同温度（523~723 K）和应变速率（0.001~10 s-1）条件下,利用Gleeble-1500D热模拟试验机,对铸态ZK60镁合金进行热压缩变形行为的研究,分析变形温度和应变速率对ZK60镁合金压缩变形行为的影响规律,即在相同应变速率条件下,随着变形温度的升高,合金的峰值应力降低。在相同温度条件下,随着应变速率的增大,合金的流变应力增大。计算其应变速率敏感指数m值为0.14和表观激活能Q值为226~254 kJ/mol。研究表明,在温度为573~673 K、应变速率为0.001~0.1 s-1时,合金发生动态再结晶。

The effects of temperatures and strain rates on the compressive deformation behavior of ZK60 magnesium alloy

Hot compressive tests of squeeze cast ZK60 alloy was performed at a strain of 0.6,various temperatures（523~723 K） and strain rates（0.001~10 s-1）.The high temperature compressive tests of squeeze casting ZK60 magnesium alloy were performed on Gleeble-1500D thermol simulator testing machine.The flow stress behaviors of the alloy at different deformation conditions were investigated.It is shown that the flow stress rises with increase of the strain rate at the same temperature,and the flow stress decreases with increase of the temperature at the same strain rate.Strain rate sensitivity exponent（m=0.14） and apparent activation energy（Q=226~254 kJ/mol） were calculated.Dynamic recrystallization grains were observed at temperatures of 573~673 K and strain rates of 0.001~0.1 s-1.