(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 利用Geeble1500 熱模擬實(shí)驗(yàn)機(jī)對雙輥連續(xù)鑄軋AZ31B鎂板在變形溫度為100 ℃，應(yīng)變速率為10−3 s−1的條件下進(jìn)行單軸壓縮變形, 并利用金相顯微鏡和透射電子顯微鏡對其微觀組織進(jìn)行觀察。結(jié)果表明：在上述的條件下變形時，合金中產(chǎn)生大量的孿晶，孿晶與孿晶之間相互交截，在孿晶界及孿晶交截區(qū)出現(xiàn)大量的位錯，并且有動態(tài)再結(jié)晶核心及再結(jié)晶小晶粒，說明該合金中動態(tài)再結(jié)晶形核位置主要為孿晶界及孿晶−孿晶交截區(qū)。
關(guān)鍵字: AZ31B鎂合金；孿生；孿晶−孿晶交截；動態(tài)再結(jié)晶；變形機(jī)制
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The uniaxial compression test was carried out on the Geeble1 500 simulator at 100 ℃ with the strain rate of 10−3 s−1 to analyze the compression behavior of twin-roll casting AZ31B Mg alloys, and their microstructures were studied by optical microscopy (OM) and TEM. The results show that a large number of twins are observed under the deformation conditions. In addition, twins intersect with each other and tangled dislocations locate in twins-intersected zone. Further more, a few dynamic recrystallization (DRX) nuclei and tiny DRX grains are observed in the twinning band and twins-intersections, which implies that the main places where DRX nuclei form are in twin boundaries and twins-intersection zones.
Key words: AZ31B Mg alloy; twinning, twins-intersection; dynamic recrystallization; deformation mechanism
