(1. 上海交通大学 轻合金精密成型国家工程研究中心，上海 200240；
2. 上海交通大学 金属基复合材料国家重点实验室，上海 200240)
摘 要: 针对变形镁合金存在的典型织构以及织构优化设计方面的研究工作和进展进行综合评述。镁合金由于基面滑移和 孪生是最容易开动的变形模式，在变形镁合金中容易形成挤压丝织构及轧制板织构。通过引入剪切变形，改变成型过程中外加应力的取向，能够有效地改变变形镁合金的织构，同时通过添加微量稀土元素Nd、Ce和Y等，能够明显弱化或随机化变形镁合金织构。织构随机化后的镁稀土合金具有较好的强韧性，合金的变形各向异性得以改善。添加稀土元素后会改变稀土元素与Mg原子间的键能，改变稀土元素周围Mg-Mg原子之间的结合能等，增加非基面滑移的可能性，减弱基面滑移及 孪生所占的比率，有效地弱化镁合金的织构。
关键字: 变形镁合金；织构；基面滑移；孪生；织构
（1. National Engineering Research Center of Light Alloy Net Forming，Shanghai Jiao Tong University,
Shanghai 200240, China;
2. Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The texture and texture evolution of wrought Mg alloy were investigated. The dislocation slip on (0001) plane and the tension twinning are the main deformation modes and resulted in the typical basal textures in Mg extrusion and sheet. The texture can be altered by changing deformation method, and the rare earth addition is another important way to weaken and randomize the texture of wrought Mg alloy, such as Nd, Ce and Y addition. The wrought alloy with random texture displays good strength and ductility, especially good tension-compression yield symmetry. The mechanism for texture randomization or weakening was also addressed. The rare earth (RE) addition may alert the bond energy between Mg atom with RE atom, improve the possibility of non-basal slip, but inhibit the basal slip and the twinning, and the texture is weakened.
Key words: wrought Mg alloy; texture; basal slip; twin; texture
