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AZ80鎂合金動(dòng)態(tài)再結(jié)晶軟化行為研究

發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn 更新時(shí)間：2016-05-28
采用等溫壓縮實(shí)驗(yàn)獲得了變形溫度為 200~400 ℃, 應(yīng)變速率為 0.001~1 s-1的 AZ80 鎂合金的流變應(yīng)力曲線, 考慮動(dòng)態(tài)硬化及軟化特性描述了 AZ80 鎂合金熱變形過(guò)程動(dòng)態(tài)再結(jié)晶主導(dǎo)的軟化行為. 提出基于動(dòng)態(tài)材料模型的應(yīng)變速率敏感性指數(shù)表征動(dòng)態(tài)再結(jié)晶引起的能量耗散, 該指數(shù)通過(guò)引入動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)描述微觀組織演化的耗散功.
AZ80鎂合金動(dòng)態(tài)再結(jié)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(shí)驗(yàn)獲得了變形溫度為 200~400 ℃, 應(yīng)變速率為 0.001~1 s-1的 AZ80 鎂合金的流變應(yīng)力曲線, 考慮動(dòng)態(tài)硬化及軟化特性描述了 AZ80 鎂合金熱變形過(guò)程動(dòng)態(tài)再結(jié)晶主導(dǎo)的軟化行為. 提出基于動(dòng)態(tài)材料模型的應(yīng)變速率敏感性指數(shù)表征動(dòng)態(tài)再結(jié)晶引起的能量耗散, 該指數(shù)通過(guò)引入動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)描述微觀組織演化的耗散功. 考慮變形溫度和應(yīng)變速率構(gòu)建了不同應(yīng)變的應(yīng)變速率敏感性指數(shù)圖, 實(shí)現(xiàn)應(yīng)變速率敏感性指數(shù)對(duì)動(dòng)態(tài)再結(jié)晶軟化行為的量化表征. 在此基礎(chǔ)上, 研究了變形溫度、應(yīng)變速率對(duì)動(dòng)態(tài)再結(jié)晶臨界條件及演化過(guò)程的影響, 重點(diǎn)分析了不同應(yīng)變的應(yīng)變速率敏感性指數(shù)圖特征. 結(jié)果表明: 隨著變形溫度的升高和應(yīng)變速率的降低, 動(dòng)態(tài)再結(jié)晶軟化臨界應(yīng)變減小及動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)增加; 應(yīng)變速率敏感性指數(shù)與動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)正相關(guān), 指數(shù)大于0.21的區(qū)域?qū)?yīng)著高動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù), 且均位于低應(yīng)變速率下, 并通過(guò)動(dòng)態(tài)再結(jié)晶軟化的微觀組織進(jìn)行了驗(yàn)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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