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AZ31鎂合金熱壓縮過程中晶粒取向和織構(gòu)的演變
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更新時間：2015-10-17
利用電子背散射衍射(EBSD)取向成像技術(shù)分析AZ31鑄態(tài)鎂合金在不同溫度和真應(yīng)變下熱壓縮的晶粒取向和織構(gòu)特點，從晶粒取向和織構(gòu)角度分析不同溫度下其動態(tài)再結(jié)晶(DRX)的類型。
AZ31鎂合金熱壓縮過程中晶粒取向和織構(gòu)的演變Grain orientation and texture evolution of AZ31 magnesium alloy during hot compression
利用電子背散射衍射(EBSD)取向成像技術(shù)分析AZ31鑄態(tài)鎂合金在不同溫度和真應(yīng)變下熱壓縮的晶粒取向和織構(gòu)特點，從晶粒取向和織構(gòu)角度分析不同溫度下其動態(tài)再結(jié)晶(DRX)的類型。結(jié)果表明：在熱壓縮過程中，350 ℃時，AZ31鑄態(tài)鎂合金表現(xiàn)為連續(xù)動態(tài)再結(jié)晶(CDRX)特征，新晶粒取向與基體相似，具有較強的{0002}基面織構(gòu)，以基面滑移為主；500 ℃時，為旋轉(zhuǎn)動態(tài)再結(jié)晶(RDRX)特征，真應(yīng)變?yōu)?.5時，新晶粒取向與基體偏轉(zhuǎn)成一定角度，具有兩種主要的基面織構(gòu)，由于動態(tài)再結(jié)晶的定向形核、擇優(yōu)核心長大和旋轉(zhuǎn)動態(tài)再結(jié)晶造成這兩種基面織構(gòu)弱于350℃時的{0002}基面織構(gòu)；且隨著真應(yīng)變的增加，其中一種織構(gòu)由于滑移系的改變而逐漸消失。
The characteristics for grain orientation and texture of AZ31 magnesium alloy were investigated by the electron back scattering diffraction (EBSD) technique at different temperatures and strains during hot compression. The types of dynamic recrystallization (DRX) for AZ31 magnesium alloy under different temperatures were researched based on the grain orientation and texture. The results show that, at 350 ℃, it displays the characteristics of continue dynamic recrystallization (CDRX). The new grains are similarly orientated to the basal grain, which has strong {0002} basal texture and is mainly on the basal slip. At 500 ℃, it shows the characteristics of rotation dynamic recrystallizaion (RDRX). At a true strain of 0.5, the orientation of new grain deviates from the orientation of basal grain. The oriented nucleation, preferred core growth and RDRX attribute to the two different main basal textures, which is weaker than that of {0002} basal texture at 350 ℃. With the true stain increasing, one of the basal textures gradually disappears for altering slip systems.
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