( 1. 東北大學(xué) 材料電磁過程研究教育部重點(diǎn)實(shí)驗(yàn)室，沈陽 110004;
2. 東北大學(xué) 理學(xué)院， 沈陽 110004)
摘 要: 采用Gleeble-1500D熱模擬試驗(yàn)機(jī)、 差熱分析儀和光學(xué)顯微鏡等對低頻電磁鑄造AZ41鎂合金鑄錠熱壓縮流變特征及微觀組織進(jìn)行研究。 結(jié)果表明： AZ41鎂合金鑄錠熱壓縮變形存在明顯的動態(tài)回復(fù)和動態(tài)再結(jié)晶特征； 當(dāng)溫度為453～523 K時， 以動態(tài)回復(fù)為主； 當(dāng)溫度為593～723 K時， 以動態(tài)再結(jié)晶為主要機(jī)制； 當(dāng)溫度為593 K， 應(yīng)變速率為1.0 s-1時， 形變激活能最低， 流變過程最穩(wěn)定， 中心和邊緣部位的晶粒得到明顯細(xì)化。 在變形期間， Mg17Al12相的破碎和溶解促進(jìn)動態(tài)再結(jié)晶顯著發(fā)生。
關(guān)鍵字: AZ41鎂合金； Mg17Al12 相； 低頻電磁鑄造； 動態(tài)再結(jié)晶
ZHANG Cai-bei2
（ 1. Key Laboratory of Electromagnetic Processing of Materials,
Ministry of Education, Northeastern University,
Shenyang 110004, China;
2. College of Science, Northeastern University,
Shenyang 110004, China）
Abstract: The characteristics of thermal compressing flow and microstructure of AZ41 magnesium alloy cast by low frequency electrical magnetic field (LFEMC) were studied through thermal simulation tester Gleeble-1500D.The results show that there exist obviously dynamic recovery and dynamic recrystallization (DRX) during thermal compression of the LFEMC AZ41 magnesium alloy. The dynamic recovery is prominent character at 453-523 K, but DRX is prominent behavior at 593-723 K. The flow process is the most stable and the microstructures at the center and the edge of specimens are markedly refined by DRX at the temperature of 593 K and the strain rate of 1.0 s-1. The crash and dissolution of Mg17Al12 phase accelerate DRX during deforming.
Key words: AZ41 magnesium alloy; Mg17Al12 phase; low frequency electrical magnetic field; dynamic recrystallization
