(1. 上海交通大学 材料科学与工程学院，上海 200240；
2. 上海交通大学 轻合金精密成型国家工程研究中心，上海 200240)
摘 要: 通过光学显微观察(OM)、扫描电镜观察(SEM)、透射电镜观察(TEM)、X射线衍射(XRD)及力学性能测试等方法，研究Mg-0.5%Zn-0.5%Ce-0.5%Zr合金在温度为400 ℃，轧制速率为10 m/min，道次压下量分别为20%、30%和50%条件下轧制及退火后的微观组织及力学性能。结果表明：在400 ℃，以不同道次压下量轧制后，合金发生了不同程度的动态回复，且道次压下量为50%时，轧制后的合金中包含了更多的位错结构。轧制后合金主要呈现典型的{0001}基面织构，且采用大道次压下量轧制的合金的基面织构较强。轧制合金经500 ℃退火后，发生了明显的静态再结晶，退火后组织的{0001}基面织构明显减弱，这主要由于静态再结晶后晶粒取向发生转变，弱化了基面织构。由于织构的存在，轧制态合金表现出明显的各向异性；退火后，由于织构弱化，合金的各向异性得到明显改善。
关键字: Mg-Zn-Ce-Zr合金；道次压下量；退火；微观组织；力学性能
（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
