新聞資訊
ZM21及ZM61合金的熱變形行為與動態再結晶臨界條件的表征
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-08-22
采用Gleeble-1500熱/力模擬試驗機進行壓縮實驗，研究Mg-2Zn-1Mn (ZM21)與Mg-6Zn-1Mn (ZM61)合金在變形溫度523~723 K、應變速率0.01~10 s-1范圍內的流變應力行為，并以熱壓縮實驗為基礎，建立兩種合金的動態模型加工圖，引入材料加工硬化率θ，結合θ—σ曲線拐點判據識別合金發生動態再結晶的臨界應變εc。
ZM21及ZM61合金的熱變形行為與動態再結晶臨界條件的表征Thermal compression behavior and characterization of dynamic
recrystallization critical conditions for ZM21 and ZM61 magnesium alloys
采用Gleeble-1500熱/力模擬試驗機進行壓縮實驗，研究Mg-2Zn-1Mn (ZM21)與Mg-6Zn-1Mn
(ZM61)合金在變形溫度523~723 K、應變速率0.01~10
s-1范圍內的流變應力行為，并以熱壓縮實驗為基礎，建立兩種合金的動態模型加工圖，引入材料加工硬化率θ，結合θ—σ曲線拐點判據識別合金發生動態再結晶的臨界應變εc。結果表明，ZM21與ZM61合金在熱壓縮過程中發生明顯的動態回復與動態再結晶；隨著Zn含量的增加，ZM61合金的變形激活能比ZM21合金的升高約20%，并且ZM61合金在高溫變形時更容易出現失衡；兩者發生動態再結晶的臨界應變εc均隨著應變速率的增加而升高，隨變形溫度的升高而降低。
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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