(南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室，南昌 330063)
摘 要: 通過(guò)測(cè)試與分析不同脈沖超聲功率、施振時(shí)間、脈沖超聲頻率下ZL205A合金微觀組織及Cu元素含量，系統(tǒng)研究脈沖超聲工藝對(duì)ZL205A合金微觀組織及偏析的影響。結(jié)果表明：脈沖超聲工藝對(duì)ZL205A合金微觀組織及偏析影響的顯著。隨著的脈沖超聲功率、施振時(shí)間、脈沖超聲頻率增大，ZL205A合金的組織越來(lái)越細(xì)小且圓整，隨后ZL205A合金的組織又逐漸粗大且不規(guī)則。最佳脈沖超聲工藝為脈沖超聲功率1200 W、施振時(shí)間120 s、脈沖超聲頻率1.67 Hz。脈沖超聲工藝改變Cu元素在a (Al)中的分布曲線，在一定范圍內(nèi)提高Cu元素的有效分配系數(shù)ke，對(duì)脈沖超聲功率與施振時(shí)間影響較大，改變Cu元素在凝固過(guò)程中溶質(zhì)再分配行為，改善ZL205A合金微觀偏析。
關(guān)鍵字: 脈沖超聲；ZL205A合金；微觀組織；微觀偏析
（National Defence Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The effect of pulsed ultrasonic process on the microstructure and microsegregation of ZL205A alloy was studied systemically through testing and analyzing the microstructure and Cu element content under different pulsed ultrasonic powers, applying vibration time and pulsed ultrasonic frequency. The results indicate that the pulse ultrasonic process has significant effects on the microstructure and microsegregation of ZL205A alloy. With the increase of pulsed ultrasonic power, applying vibration time and pulsed ultrasonic frequency, the microstructures of ZL205A alloy become more and more fine and round, however, with further increasing, the microstructure turns rough and irregular. The optimal pulse ultrasonic process is pulsed ultrasonic power of 1200 W, applying vibration time of 120 s and pulsed ultrasonic frequency of 1.67 Hz. Meanwhile, the pulsed ultrasonic process has changed the distribution curve of Cu element in a(Al), and the effective distribution coefficient ke of Cu element is improved within a certain range, especially, the effects of the pulsed ultrasonic power and applying vibration time are significant, which change the behavior of Cu element solute redistribution in the process of solidification and improve the microsegregation of ZL205A alloy.
Key words: pulsed ultrasound; ZL205A alloy; microstructure; microsegregation
