組織與織構(gòu)演變
(中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用金相顯微鏡、掃描電鏡和X射線衍射儀，對(duì)Mg-7Gd-4Y-1Nd-0.5Zr合金鑄錠在450 ℃條件下軋制變形過程中的微觀組織和織構(gòu)演變規(guī)律進(jìn)行研究。結(jié)果表明：該合金在軋制過程中存在著兩種織構(gòu)組分：基面織構(gòu)和棱柱面織構(gòu)。隨變形程度的增加，基面織構(gòu)不斷增強(qiáng)，棱柱面織構(gòu)不斷減弱。在450 ℃條件下軋制時(shí)，棱柱面滑移系啟動(dòng)協(xié)調(diào)晶粒的塑性變形形成棱柱面織構(gòu)，形成的棱柱面織構(gòu)組分在后續(xù)變形過程中通過 < >孿生及退火過程中孿生區(qū)域的靜態(tài)再結(jié)晶而不斷被削弱。
關(guān)鍵字: 滑移系；孿生；織構(gòu)；再結(jié)晶
Mg-7Gd-4Y-1Nd-0.5Zr alloy during hot rolling
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The microstructure and texture evolution of Mg-7Gd-4Y-1Nd-0.5Zr alloy during hot rolling at 450 ℃ were investigated by means of OM, SEM and XRD. The results show that there exist two components of textures: basal texture and prismatic texture. The basal texture becomes stronger and stronger and the prismatic texture becomes weaker and weaker with increasing the strain. The prismatic texture is formed by the initiation of the prismatic slip system in the grains with particular orientations, the prismatic texture is weakened by < > twinning and static recrystallization twinning-induced during annealing.
Key words: slip system; twinning; texture; recrystallization
