(1. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院，上海 200240；
2. 上海交通大學(xué) 輕合金精密成型國家工程研究中心，上海 200240)
摘 要: 通過光學(xué)顯微觀察(OM)、掃描電鏡觀察(SEM)、透射電鏡觀察(TEM)、X射線衍射(XRD)及力學(xué)性能測試等方法，研究Mg-0.5%Zn-0.5%Ce-0.5%Zr合金在溫度為400 ℃，軋制速率為10 m/min，道次壓下量分別為20%、30%和50%條件下軋制及退火后的微觀組織及力學(xué)性能。結(jié)果表明：在400 ℃，以不同道次壓下量軋制后，合金發(fā)生了不同程度的動態(tài)回復(fù)，且道次壓下量為50%時，軋制后的合金中包含了更多的位錯結(jié)構(gòu)。軋制后合金主要呈現(xiàn)典型的{0001}基面織構(gòu)，且采用大道次壓下量軋制的合金的基面織構(gòu)較強。軋制合金經(jīng)500 ℃退火后，發(fā)生了明顯的靜態(tài)再結(jié)晶，退火后組織的{0001}基面織構(gòu)明顯減弱，這主要由于靜態(tài)再結(jié)晶后晶粒取向發(fā)生轉(zhuǎn)變，弱化了基面織構(gòu)。由于織構(gòu)的存在，軋制態(tài)合金表現(xiàn)出明顯的各向異性；退火后，由于織構(gòu)弱化，合金的各向異性得到明顯改善。
關(guān)鍵字: Mg-Zn-Ce-Zr合金；道次壓下量；退火；微觀組織；力學(xué)性能
（1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The microstructures and mechanical properties of rolled Mg-0.5%Zn-0.5%Ce-0.5%Zr alloy were investigated. The alloy was rolled with different per-pass reductions (20%, 30%, 50%) at 400 ℃ and run speed of 10 m/min. The microstructures were observed by OM, SEM, TEM and XRD. The results show that only dynamic recovery (DRV) takes place in Mg-Zn-Ce-Zr alloy during rolling at 400 ℃ with various per-pass reductions. Meanwhile, more dislocations are found in 50% per-pass reduction rolled alloy. The overall texture intensity of {0001} basal plane is weaker for 20% per-pass reduction rolled alloys compared to 30% or 50%. After annealing at 500 ℃, the static recrystallization occurs in Mg-Zn-Ce-Zr alloy sheets. Texture weakening also happens after annealing, this is attributed to grain rotation during static recrystallization. Obvious anisotropy is found in the rolled alloys due to the basal texture, and then the anisotropy is weakened by texture randomization.
Key words: Mg-Zn-Ce-Zr alloy; per-pass reduction; annealing treatment; microstructure; mechanical property
