AZ80鎂合金動態再結晶軟化行為研究
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-05-28
采用等溫壓縮實驗獲得了變形溫度為 200~400 ℃, 應變速率為 0.001~1 s-1的 AZ80 鎂合金的流變應力曲線, 考慮動態硬化及軟化特性描述了 AZ80 鎂合金熱變形過程動態再結晶主導的軟化行為. 提出基于動態材料模型的應變速率敏感性指數表征動態再結晶引起的能量耗散, 該指數通過引入動態再結晶體積分數描述微觀組織演化的耗散功.
AZ80鎂合金動態再結晶軟化行為研究STUDY ON THE DYNAMIC RECRYSTALLIZATION SOFTENING?BEHAVIOR OF AZ80 MAGNESIUM ALLOY采用等溫壓縮實驗獲得了變形溫度為 200~400 ℃, 應變速率為 0.001~1 s-1的 AZ80 鎂合金的流變應力曲線, 考慮動態硬化及軟化特性描述了 AZ80 鎂合金熱變形過程動態再結晶主導的軟化行為. 提出基于動態材料模型的應變速率敏感性指數表征動態再結晶引起的能量耗散, 該指數通過引入動態再結晶體積分數描述微觀組織演化的耗散功. 考慮變形溫度和應變速率構建了不同應變的應變速率敏感性指數圖, 實現應變速率敏感性指數對動態再結晶軟化行為的量化表征. 在此基礎上, 研究了變形溫度、應變速率對動態再結晶臨界條件及演化過程的影響, 重點分析了不同應變的應變速率敏感性指數圖特征. 結果表明: 隨著變形溫度的升高和應變速率的降低, 動態再結晶軟化臨界應變減小及動態再結晶體積分數增加; 應變速率敏感性指數與動態再結晶體積分數正相關, 指數大于0.21的區域對應著高動態再結晶體積分數, 且均位于低應變速率下, 并通過動態再結晶軟化的微觀組織進行了驗證.?
Magnesium alloys are considered as one of the lightest structural metallic materials with excellent?properties such as high specific strength, superior damping characteristics and electromagnetic shielding?performance. In order to improve the mechanical properties of magnesium alloys, the hot rolling, hot extrusion?and other hot forming processes are often introduced to produce the high performance parts. Both of the two?softening mechanisms, dynamic recovery and dynamic recrystallization (DRX), occur during the hot deformation.?As an important softening mechanism in hot processing, DRX is beneficial to obtaining fine grains structure,?eliminating defects and improving mechanical properties?for magnesium alloys. In this work, isothermal?compression tests of AZ80 magnesium alloy were?conducted on Gleeble thermo-mechanical simulator in the?temperature range of 200 to 400 ℃ and strain rate range?of 0.001 to 1 s-1. In view of the dynamic hardening and softening mechanisms, the softening behavior of AZ80?magnesium alloy, dominated by dynamic recrystallization, was depicted. Dynamic recrystallization volume?fraction was introduced to reveal the power dissipation during the microstructural evolution which was indicated?by the strain rate sensitivity value based on the dynamic material model. To quantify the dynamic recrystallization?softening behavior by the strain rate sensitivity (SRS) value, the SRS value distribution maps were constructed?depending on various temperatures and strain rates. Therefore, the critical conditions and evolution process were?studied in terms of temperatures and strain rates, while features of the SRS value distribution maps at different?strains were deeply investigated. It can be concluded that the value of dynamic recrystallization critical condition?decreases and dynamic recrystallization volume fraction increases when the temperature increases and strain rate?decreases during the deformation. The strain rate sensitivity was positive correlated with the dynamic?recrystallization volume fraction. It has been verified effectively by the analysis of microstructure that the region?in which the strain rate sensitivity value is above 0.21 corresponds to the higher dynamic recrystallization volume?fraction and lower strain rate.?
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