新聞資訊
室溫多向鍛壓AZ31鎂合金的靜態再結晶行為
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-04
通過光學顯微鏡(OM)及電子背散射衍射分析技術(EBSD)研究室溫多向鍛壓(MDF)下AZ31鎂合金在473 K下的靜態再結晶(SRX)行為，對高密度孿晶組織的再結晶行為、顯微組織演變、再結晶動力學及退火初期再結晶晶粒取向進行研究。
室溫多向鍛壓AZ31鎂合金的靜態再結晶行為Static recrystallization behavior of multi-directionallyforged AZ31 magnesium alloy at room temperature
通過光學顯微鏡(OM)及電子背散射衍射分析技術(EBSD)研究室溫多向鍛壓(MDF)下AZ31鎂合金在473 K下的靜態再結晶(SRX)行為，對高密度孿晶組織的再結晶行為、顯微組織演變、再結晶動力學及退火初期再結晶晶粒取向進行研究。結果表明：室溫多向鍛壓AZ31鎂合金的累積應變量越大，孿晶密度越高，退火過程中越容易發生再結晶。不管試樣累積應變量高還是低，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，但低累積應變量試樣比高累積應變量試樣更遲進入第二階段，進入第三階段低累積應變量試樣硬度繼續呈下降趨勢而高累積應變量試樣硬度基本處于穩態。高累積應變量試樣能用JMAK方程很好地描述退火組織的再結晶過程，但低累積應變量試樣卻不能。退火初期，再結晶晶粒與母相仍然保持孿晶關系，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.
獲取更多我們供應的合金和服務信息，請致電086-021-67660801或發電子郵件kefu@ailiaigroup.com聯系我們，您也可以通過微博和微信和我們互動。
For more information on the alloys and services that we supply,?call us?at 086-021-67660801 or email us at kefu@ailiaigroup.com. You can also get in touch on social media, we are constantly active on?Weibo?and?Weixin.