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2D70鋁合金熱變形行為及加工圖
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時間：2015-08-22
采用THERMECMASTOR-Z熱模擬實驗機對2D70鋁合金進行等溫恒應變速率壓縮實驗，基于加工圖技術研究該合金在320~530 ℃和0.001~70.0 s-1范圍內(nèi)的變形特性，并優(yōu)化出適宜的變形熱力學參數(shù)范圍。
2D70鋁合金熱變形行為及加工圖Hot deformation behavior and processing map of aluminum
alloy 2D70
采用THERMECMASTOR-Z熱模擬實驗機對2D70鋁合金進行等溫恒應變速率壓縮實驗，基于加工圖技術研究該合金在320~530
℃和0.001~70.0
s-1范圍內(nèi)的變形特性，并優(yōu)化出適宜的變形熱力學參數(shù)范圍。結果表明：在熱變形過程中，隨著真應變的增加，合金的變形失穩(wěn)區(qū)域增大。當應變速率較大(≥1.0
s-1)時，變形多處于失穩(wěn)區(qū)域；當變形溫度低于350 ℃、應變速率大于1.0
s-1時，微觀組織中出現(xiàn)了裂紋；當變形溫度高于500 ℃、應變速率大于1.0
s-1時，易出現(xiàn)機械失穩(wěn)；而在變形溫度低于350 ℃、應變速率低于0.1
s-1時，微觀組織中出現(xiàn)楔形裂紋。綜合加工圖以及微觀組織觀察結果，獲得了試驗參數(shù)范圍內(nèi)熱變形的最佳工藝參數(shù)，變形溫度為370~460
℃、應變速率為0.004~0.1 s-1。
The isothermal compression tests with constant strain
rate for aluminum alloy 2D70 were conducted by THERMECMASTOR-Z hot simulator.
The hot deformation behaviors in the temperature range of 320-530 ℃ and the
strain rate range of 0.001-70.0 s-1 were investigated. Then, the
processing maps under these deformation conditions were constructed and the
deformation thermomechanical parameters were then optimized based on the
generated processing maps. The results show that the flow instability zone
increases with true strain increasing during the hot deformation process.
Otherwise, when the strain rate is higher than 1.0 s-1, most of the
deformation behavior is located at the flow instable zone. Under this condition,
the domain of flow localization appears at the temperature lower than 350 ℃ and
mechanical instability exhibits at the temperature higher than 500 ℃. While,
when the strain rate is lower than 0.1 s-1 and the temperature is
lower than 350 ℃, the wedge cracking can be found. On the base of the
experimental results including processing map and microstructure, the optimum
deformation thermomechanical parameter ranges of aluminum alloy 2D70 can be
confirmed to the temperature range of 370-460 ℃ and the strain rate range of
0.004-0.1 s-1.
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