(1. 上海交通大学 材料科学与工程学院，上海 200240；2. 中南大学 材料科学与工程学院，长沙 410083)
摘 要: 采用X射线衍射表征异步与同步复合轧制法制备的纳米晶钛和退火后微米晶钛的晶体学织构，并探讨纳米晶纯钛中织构与力学性能的关系。结果表明：纳米晶Ti中主要存在有变形产生的{0001}基面织构以及 á ？、 á ？和 á ？等多种再结晶织构组分，且变形织构强于再结晶织构。纳米晶Ti中再结晶织构较大体积分数的存在表明：强烈塑性变形过程中发生了较大程度的原位动态再结晶，从而形成具有大角度晶界的等轴纳米晶组织。纳米晶Ti经退火处理后，变形织构强度降低；在较高温度(500 ℃)退火时，再结晶织构体积分数因晶粒正常长大而减小。纳米晶Ti中{0001}基面织构增加板厚方向的变形阻力，使RD-TD面的硬度高于其他各面的硬度； á ？和 á ？等织构增加TD方向的变形阻力，使ND-RD面的硬度稍高于TD-ND面的。
关键字: 钛；纳米晶；轧制；织构；硬度
（1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. School of Materials Science and Technology, Central South University, Changsha 410083, China）
Abstract:The textures in nano-grained (NG) Ti produced by combination of asymmetric and symmetric rolling were studied by X-ray diffraction method, and the relationships between textures and mechanical properties were also investigated. The main textures in the NG Ti are basal plane texture {0001} formed by deformation and a multiple recrystallization textures, such as á ？, á ？ and á ？. The orientation density of deformation textures are larger than that of the recrystallization textures in the NG Ti. The large volume fraction of recrystallization textures in NG Ti indicates that in-situ recrystallization occurs during the severe plastic deformation process. The density of deformation textures in this NG Ti decreases after annealing while the volume fraction of recrystallization textures reduces after annealing at relatively higher temperature due to the normal growth of grains. The deformation resistance in normal direction of the plates is increased by the basal plane texture {0001}, leading to the highest hardness of RD-TD plane. Meanwhile, The deformation resistance in transversal direction of the plates is increased by the texture of á ？, á ？ and other recrystallization textures, therefore, the hardness of ND-RD plane is higher than that of TD-ND plane.
Key words: titanium; nano grain; rolling; texture; hardness
