反应模晶生长法制备BNKT织构化陶瓷的研究

以熔盐法制备的片状Bi4Ti3O12作为种晶，通过流延工艺，采用反应模晶生长法（RTGG）制备了具有〈001〉择优取向的Bi0．5（Na0.8K0.2）0．5TiO3（BNKT）陶瓷。研究了流延工艺和烧结工艺参数对织构化程度的影响，XRD测试结果表明，这种方法得到的BNKT陶瓷具有f≥0．9的织构度，其压电性能也有了很大提高，与传统方法相比，d33增长了32％。     

用ODF理论研究Fe－30Ni合金α－γ_r逆相变过程的织构变化

研究了Ｆｅ－３０Ｎｉ合金冷轧板由马氏体到奥氏体（α－γ_ｒ）逆相变过程中的织构变化．原始材料的组织状态为形变马氏体、淬火马氏体及残余奥氏体．经过在不同温度加热后,利用Ｘ射线衍射精确测量了马氏体及奥氏体的取向密度分布函数（ＯｒｉｅｎｔａｔｉｏｎＤｉｓｔｒｉｂｕｔｉｏｎＦｕｎｃｔｉｏｎ简称ＯＤＦ）．结果表明,逆相变过程中奥氏体的织构变化可分为两个阶段：低温区,奥氏体织构逆变为原冷轧奥氏体织构,相变的进行可解释为具有强烈取向选择的剪切机制;高温区,相变的进行为定向长大机制,逆变奥氏体织构与冷轧奥氏体织构之间出现偏差,｛２１１｝〈１１１〉织构成分比原冷轧织构强度变弱．由ＯＤＦ差得到两温度区间的相变停止温度,此温度与取向有关,并可假设为相变机制变化温度．相变停止温度越高的取向,以定向长大机制进行的相变开始得越晚．     

EBSD characterization of recrystallization microstructure of cold-swaged Ti-23Nb-0.7Ta-2Zr-O alloy

The microstructures of the cold-swaged and recrystallized Ti-23Nb-0.7Ta-2Zr-O （TNTZO） （mole fraction, %） alloy were investigated by electron backscatter diffraction （EBSD）. The difference in microstructure, texture and recrystallization process was evaluated between the TNTZO alloy and traditional body centered cubic （bcc） metals. The results show that the cold-swaged TNTZO alloy presents a pronounced （110） fiber texture in the axial direction. The recrystallization of the TNTZO alloy is achieved by the nucleation of new grains and the growth of these new grains at the expense of the deformed structure. The TNTZO alloy behaves a very similar way to traditional bcc metals in the features of the microstructure, texture and recrystallization.     

电场退火对08Al深冲钢板再结晶织构的影响

利用X射线衍射ODF分析方法，研究了电场对08Al深冲钢板单台阶退火和双台阶退火再结晶织构的影响。结果表明：电场提高了再结晶γ纤维织构的强度，同时降低了再结晶α纤维织构的强度。产生上述结果的主要原因是由于电场降低了各取向的形变储能，从而抑制了储存能小的取向晶核的形成及长大，促进了储存能大的再结晶γ取向晶粒的择优生长。     

唐钢冷连轧低碳薄板深冲性能的研究

采用唐山钢铁股份有限公司FTSR连铸连轧生产线生产的热轧卷作为生产冷轧低碳钢板的原料，研究了不同卷取温度和冷轧压下率对冷轧薄板深冲性能的影响。结果表明，采用低温卷取有利于提高钢板的深冲性能。以3．5mm厚和2．5mm厚热轧板为原料的冷轧低碳钢板的r值分别在冷轧压下率为70．2％和71．3％时出现峰值。生产厚度大于等于0．8mm的低碳钢板时应采用3．5mm厚的热轧卷，生产厚度小于0．8mm的冷轧板时应采用2．5mm厚的热轧卷。     

Finite element polycrystal model simulation of cold rolling textures in deformation processed two-phase Nb／Al metal-metal composites

The finite element polyerystal model (FEPM) was extended and applied to simulate the development of the cold rolling textures of matrix aluminum in deformation processed two-phase 10% and 20% Nb/Al(in volume fraction) metal-metal composites on the basis of slip deformation of individual grains. This simulation method can assure the continuity of stress and displacement at the boundary during heterogeneous deformation and take arbitrary boundary conditions into consideration. The starting hot-extruded textures, as initial input condition, were taken into account in the FEPM simulation. The simulation results show that the main texture components and their evolution after various cold rolling reductions in 10% and 20% Nb/Al metal-metal composites are well qualitatively in agreement with the experimental ones. The initially extruded textures are rather weak, so they have no much influence on the simulated final cold rolling textures of the matrix aluminum for Nb/Al composites.     

PRIMARY RECRYSTALLIZATION TEXTURES OF 70-30 BRASS ROLLED BY CROSS SHEAR ROLLING IN SINGLE DIRECTION

ＰＲＩＭＡＲＹＲＥＣＲＹＳＴＡＬＬＩＺＡＴＩＯＮＴＥＸＴＵＲＥＳＯＦ７０－３０ＢＲＡＳＳＲＯＬＬＥＤＢＹＣＲＯＳＳＳＨＥＡＲＲＯＬＬＩＮＧＩＮＳＩＮＧＬＥＤＩＲＥＣＴＩＯＮ￥ＺｈａｏＸｉａｎｇ；ＬｉｕＹａｎｓｈｅｎｇ；ＸｕＪｉａｚｈｅｎ；ＬｉａｎｇＺ...     

一种预测织构板材制耳倾向的新方法

提出了一种根据板材晶体学织构预测深中制耳行为的新方法，预测了立方金属板中重要织构组分的制耳倾向类型及相对大小，结果优于传统的晶体学方法，可用于抑制深冲制耳的织构平衡设计。     

Determination of Active Slip/Twinning Modes in AZ31 Mg Alloy Near Room Temperature

In order to determine the deformation modes in AZ31 magnesium alloy at room temperature, computer simulations of deformation texture development and calculation of formability have been carried out. The simulation results were compared with the measured texture results. Based on agreement between the experiments and simulations the active deformation modes were determined. A Visco Plastic Self Consistent model was employed for the simulation of plastic deformation. Simulations and experiments were performed for different initial textures. The goal of the study was to develop the understanding of deformation texture evolution and its effects on mechanical properties of magnesium, with an ultimate goal of improving room temperature formability of magnesium alloys. This article was presented at Materials Science & Technology 2006, Innovations in Metal Forming symposium held in Cincinnati, OH, October 15-19, 2006.