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室溫多向鍛壓AZ31鎂合金的靜態(tài)再結(jié)晶行為
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-04
通過光學(xué)顯微鏡(OM)及電子背散射衍射分析技術(shù)(EBSD)研究室溫多向鍛壓(MDF)下AZ31鎂合金在473 K下的靜態(tài)再結(jié)晶(SRX)行為，對高密度孿晶組織的再結(jié)晶行為、顯微組織演變、再結(jié)晶動力學(xué)及退火初期再結(jié)晶晶粒取向進(jìn)行研究。
室溫多向鍛壓AZ31鎂合金的靜態(tài)再結(jié)晶行為Static recrystallization behavior of multi-directionallyforged AZ31 magnesium alloy at room temperature
通過光學(xué)顯微鏡(OM)及電子背散射衍射分析技術(shù)(EBSD)研究室溫多向鍛壓(MDF)下AZ31鎂合金在473 K下的靜態(tài)再結(jié)晶(SRX)行為，對高密度孿晶組織的再結(jié)晶行為、顯微組織演變、再結(jié)晶動力學(xué)及退火初期再結(jié)晶晶粒取向進(jìn)行研究。結(jié)果表明：室溫多向鍛壓AZ31鎂合金的累積應(yīng)變量越大，孿晶密度越高，退火過程中越容易發(fā)生再結(jié)晶。不管試樣累積應(yīng)變量高還是低，硬度曲線在退火過程中均分為3個階段，且第一階段硬度值均基本不變，但低累積應(yīng)變量試樣比高累積應(yīng)變量試樣更遲進(jìn)入第二階段，進(jìn)入第三階段低累積應(yīng)變量試樣硬度繼續(xù)呈下降趨勢而高累積應(yīng)變量試樣硬度基本處于穩(wěn)態(tài)。高累積應(yīng)變量試樣能用JMAK方程很好地描述退火組織的再結(jié)晶過程，但低累積應(yīng)變量試樣卻不能。退火初期，再結(jié)晶晶粒與母相仍然保持孿晶關(guān)系，且其基面取向與最終壓縮方向垂直或平行。
Static recrystallization (SRX) behavior of a wrought AZ31 magnesium alloy at 473 K was studied after multi-directional forging (MDF) using optical microscopy (OM) and electron backscattering microscopy (EBSD). Effects of introduced high-density twins on SRX behavior, microstructural development, SRX kinetics and initial orientation of SRX grains during the isothermal annealing were investigated. The results show that SRX can be accelerated through high-density twins introduced by high cumulative strain. The variation of hardness (HV) with annealing time of wrought samples includes three periods irrespective of prior strain: HV hardly changes in the early stage of annealing and drops rapidly in the middle stage until it finally approaches the fully annealed value. At high cumulative strain, variation of HV proceeds earlier into the middle stage and then reaches a steady value while HV keeps dropping gradually in the final stage at low cumulative strain. The relationship between recrystallization volume fraction and annealing time can be perfectly described by JMAK equation at high cumulative strain but cannot at low cumulative strain. SRX grains exhibit almost same orientations of prior twins with its basal plane aligned parallel and perpendicular to the forging direction of the last pass.
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