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61.
1 Introduction Heusler type Ni2MnGa magnetic shape memoryalloy, which is a new kind of functional material withferromagnetism and thermoelastic martensitictransformation, attracts the interests of many people allover the world in recent years. The alloy … 相似文献
62.
再结晶退火对Ni_(47)Ti_(44)Nb_9合金冷轧板相组成及板材织构的影响 总被引:1,自引:0,他引:1
采用X射线衍射术和ODF研究了再结晶退火对Ni47Ti44Nb9合金冷轧板相组成和织构的影响。结果表明,冷轧板材的相组成为B2+β-Nb+B19';织构类型为面织构{001}p+{110}p再结晶退火期间,马氏体相B19'逆转变为母相B2,合金的相组成为:B2十β-Nb,而再结晶织构为:{001}<110>p。 相似文献
63.
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%。 相似文献
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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. 相似文献
67.
PRIMARYRECRYSTALLIZATIONTEXTURESOF70-30BRASSROLLEDBYCROSSSHEARROLLINGINSINGLEDIRECTION¥ZhaoXiang;LiuYansheng;XuJiazhen;LiangZ... 相似文献
68.
一种预测织构板材制耳倾向的新方法 总被引:5,自引:0,他引:5
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。 相似文献
69.
LU XY A. NAGATA K. SUGAWARA K. WATANABE T. NOJIMA 《中国有色金属学会会刊》2006,16(B01):11-19
The microstructure and superconducting properties of Bi-2223 superconductor fabricated in high magnetic fields were investigated. The results shows that the Bi-2212 grains with their c-axis parallel to the magnetic field were formed after the partial-melting and solidification in 8 T magnetic field, and transformed into the Bi-2223 grains with c-axis alignment during the further sintering process at 840 ℃ without magnetic field. The conversion of Bi-2212 grains to Bi-2223 grains has the heredity in grain alignment. The mixed structures of the Bi-2223 and the Bi-2212 grains with their c-axis parallel to the magnetic field are formed in samples sintered at 850-855 ℃ in 10 T magnetic field. When sintered in 10 T below 845 ℃, a high proportion of Bi-2223 phase is obtained, however no preferred orientation is observed. The Bi-2223 grains with their c-axis parallel to the axial direction of the vertical tube furnace are formed not only on the surface, but also in the center of the sample sintered at 850 ℃ for 120 h in a 15 ℃/cm temperature gradient without magnetic field. Moreover, the samples sintered in the temperature gradient and in a 10 T magnetic field have a stronger c-axis alignment ofbi-2223 phase. 相似文献
70.
In this paper, we introduce a novel technique for pre‐filtering multi‐layer shadow maps. The occluders in the scene are stored as variable‐length lists of fragments for each texel. We show how this representation can be filtered by progressively merging these lists. In contrast to previous pre‐filtering techniques, our method better captures the distribution of depth values, resulting in a much higher shadow quality for overlapping occluders and occluders with different depths. The pre‐filtered maps are generated and evaluated directly on the GPU, and provide efficient queries for shadow tests with arbitrary filter sizes. Accurate soft shadows are rendered in real‐time even for complex scenes and difficult setups. Our results demonstrate that our pre‐filtered maps are general and particularly scalable. 相似文献