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ZM21及ZM61合金的热变形行为与动态再结晶临界条件的表征
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-22
采用Gleeble-1500热/力模拟试验机进行压缩实验，研究Mg-2Zn-1Mn (ZM21)与Mg-6Zn-1Mn (ZM61)合金在变形温度523~723 K、应变速率0.01~10 s-1范围内的流变应力行为，并以热压缩实验为基础，建立两种合金的动态模型加工图，引入材料加工硬化率θ，结合θ—σ曲线拐点判据识别合金发生动态再结晶的临界应变εc。
ZM21及ZM61合金的热变形行为与动态再结晶临界条件的表征Thermal compression behavior and characterization of dynamic
recrystallization critical conditions for ZM21 and ZM61 magnesium alloys
采用Gleeble-1500热/力模拟试验机进行压缩实验，研究Mg-2Zn-1Mn (ZM21)与Mg-6Zn-1Mn
(ZM61)合金在变形温度523~723 K、应变速率0.01~10
s-1范围内的流变应力行为，并以热压缩实验为基础，建立两种合金的动态模型加工图，引入材料加工硬化率θ，结合θ—σ曲线拐点判据识别合金发生动态再结晶的临界应变εc。结果表明，ZM21与ZM61合金在热压缩过程中发生明显的动态回复与动态再结晶；随着Zn含量的增加，ZM61合金的变形激活能比ZM21合金的升高约20%，并且ZM61合金在高温变形时更容易出现失衡；两者发生动态再结晶的临界应变εc均随着应变速率的增加而升高，随变形温度的升高而降低。
The thermal compression behavior of Mg-2Zn-1Mn (ZM21) and
Mg-6Zn-1Mn (ZM61) magnesium alloys was investigated by uniaxial compression
tests on Gleeble-1500 thermal simulation test machine at the temperature ranging
from 523 K to 723 K and strain rate ranging from 0.01 s-1 to 10
s-1. According to the experimental results, the hot processing maps
based on the dynamic materials modeling were drawn. The critical strain
εc that the dynamical recrystallization occurs was identified by
introducing the hard working rate θ and inflection point of θ—σ curves under
different deformation. The results show that the dynamic recovery and dynamic
recrystallization occur obviously during hot compression of ZM21and ZM61 alloys.
Compared with ZM21 alloy, the deformation activation energy of ZM61 alloy
increases by 20% because of the increase of Zn content, and the ZM61 alloy is
more unstable than ZM21 alloy. The critical strain εc of both alloys
increases with the increase of strain rate and decreases with the increase of
deformation temperature.
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