摘要
为研究Mg-9Li-3Al-1.6Y合金的热变形行为,利用Gleeble-1500D型热模拟试验机,在变形温度为200~350℃、应变速率为0.001~1 s^(-1)条件下,对挤压态Mg-9Li-3Al-1.6Y合金进行热力模拟实验。通过研究该合金的真应力-真应变曲线,分析合金的双曲线正弦函数表征的本构方程和热加工性。结果表明:材料的流变应力随应变速率的增加而增加,随温度的升高而下降;用双曲正弦函数能很好地表示材料在热变形中的稳态流变应力。分析热加工图可以看出:较佳的理论热加工区为220~270℃,0.05~0.001 s^(-1);超塑性加工区域为300~350℃,0.015~0.16 s^(-1)。
In order to study the deformation behavior of the extruded Mg-9Li-3A1-1.6Y alloy at elevated temperature, the thermal simulation test with Gleeble-1500D thermal simulator was performed on Mg-9Li-3A1-1.6Y alloy at 200-350 ~C and stain rates of 0.001- 1 s-j. By analyzing the stress-strain curves, the constitutive equation and processing map of the alloy under different deformation conditions were established. The results show that the flow stress increases with the increase of strain rates at constant temperature, and decreases with increase of deformation temperature at constant stain rate. The hyperbolic sine constitutive equation can indicate the steady flow stress of the alloy deformed at elevated temperature. The analysis result of hot processing map shows the suitable hot working parameters range for this alloy is at 220-270 ℃ and at the strain of 0.05-0.001 s^-1, and the super plastic deformation range is at 300-350 ℃and at the strain of 0.015-0.16 s-1.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2017年第4期64-69,共6页
Ordnance Material Science and Engineering
基金
国家自然科学基金(51601024)
重庆市基础与前沿研究计划项目(cstc2016jcyj A0418)
关键词
镁合金
热变形行为
本构方程
热加工图
magnesium alloy
hot deformation behavior
constitutive equation
hot processing map
