水平连铸带坯QSn6.5-0.1的组织与性能

讨论了锡磷青铜QSn6.5-0.1水平连铸带坯的宏观组织特点、反偏析行为和显微缩孔。结果表明：横断面以柱状晶为主，结晶中心线普遍上移，大面出现结晶角，上下表面和侧边出现反偏析，紧临偏析区出现低Sn区，显微缩松是主要组织缺陷．是冷加工报废的主要原因，同时通过热处理试验，分析了热处理规范对锭坯性能及组织的影响，并制订出合理的热处理规范。     

定向凝固水平连铸QSn6.5-0.1合金的组织与性能

研究了定向凝固水平连铸工艺对QSn6.5-0.1合金的宏观组织、微观组织及其性能的影响。结果表明:定向凝固水平连铸工艺使QSn6.5-0.1合金形成粗大柱状晶,且柱状晶方向沿连铸线坯轴向分布;合金的微观组织更加均匀化,从而大大减少了反偏析和显微缩孔等铸造缺陷;合金的伸长率和导电率明显提高,极限强度却有所降低。     

Procedural Tree Modeling with Guiding Vectors

We propose guiding vectors to augment graph‐based tree synthesis, in which trees are collections of least‐cost paths in a graph. Each node has an associated guiding vector; edges parallel to the guiding vector are cheap, but edges are more expensive when their orientation differs from the guiding vector. We further propose an incremental method for assigning guiding vectors over the graph, in which a node's guiding vector is an incremental rotation of that of its parent. We present a complete procedural system for tree modeling; our use of guiding vectors enables the graph‐based method to produce high‐quality tree models resembling a variety of real‐world tree species.     

热处理工艺对6.5wt%高硅电工钢复合板磁性能的影响

将1 mm 6.5wt%高硅电工钢复合板在450～650 ℃范围内进行中温轧制。通过光学显微镜观察了温轧后和不同热处理工艺处理后复合板的显微组织;测试了温轧0.5 mm复合板不同状态的磁感应强度和铁损,通过显微硬度测试确定了硅元素均匀化的情况。研究表明,中温变形后的复合板塑性差、裂纹多、硬度高、磁性能差;退火工艺不能消除复合板高硅层的裂纹,对其磁性能没有本质提高;合适的扩散退火工艺可以消除中温变形中芯层出现的裂纹、降低复合板芯层的硬度、大幅度提高磁性能。     

激光快速成形TA15残余应力影响因素的研究

采用小孔法对激光快速成形TA15钛合金样件进行残余应力影响因素的研究。结果表明:激光功率、扫描速度、送粉速度、扫描方式等工艺参数对残余应力均有显著影响。激光功率越大,残余应力越大;随着扫描速度的增大,残余应力则不断减小;随着送粉速度的增大,残余应力有增加的趋势;3种扫描方式中的交错扫描是残余应力最小的成形扫描方式。最后,对成形样件不同位置的残余应力进行了测定分析,得出成形件中间位置是残余应力峰值点的结论。     

冷旋U-6.5Nb合金再结晶晶粒长大的实验研究

采用冷旋加工-退火工艺细化U-6.5Nb合金晶粒组织,研究旋压变形率、退火温度及退火时间对再结晶后晶粒组织的影响。结果表明,在研究范围内,旋压变形率对晶粒尺寸没有显著影响,随退火温度的升高和退火时间的延长,晶粒尺寸不断长大。在700, 800和900 ℃保温过程中的晶粒长大指数分别为0.47, 0.31和0.34,晶粒长大激活能为100.4 kJ/mol, 表明U-6.5Nb合金的晶粒长大受Nb原子的扩散控制     

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用X射线直接比较法表征Fe-6.5%Si合金D03有序化,衍射强度受织构及三相多数衍射峰重叠影响而造成困难。选择D03{111}特征峰与三相重叠峰D03{444}、A2B2{222}比较,由于衍射面均为晶体学{111}晶面,结合有序化转变的特征可知该方法可避免织构的影响,两峰强度的比值实为D03相体积分数与表示其次近邻有序化程度参数的乘积。用方法表征了Fe-6.5%Si合金(温轧板A2相区退火后空冷)500℃时效过程中的D03有序化。结果表明,空冷首先使其转变为亚稳定的D03相,时效前期以B2相析出为主,后期两相分离及D03相有序化程度升高。分析认为该合金相的含量、有序化程度及分布形态均影响其磁性能。     

Shape Decomposition using Modal Analysis

We introduce a novel algorithm that decomposes a deformable shape into meaningful parts requiring only a single input pose. Using modal analysis, we are able to identify parts of the shape that tend to move rigidly. We define a deformation energy on the shape, enabling modal analysis to find the typical deformations of the shape. We then find a decomposition of the shape such that the typical deformations can be well approximated with deformation fields that are rigid in each part of the decomposition. We optimize for the best decomposition, which captures how the shape deforms. A hierarchical refinement scheme makes it possible to compute more detailed decompositions for some parts of the shape.
Although our algorithm does not require user intervention, it is possible to control the process by directly changing the deformation energy, or interactively refining the decomposition as necessary. Due to the construction of the energy function and the properties of modal analysis, the computed decompositions are robust to changes in pose as well as meshing, noise, and even imperfections such as small holes in the surface.     

Fe3Si基合金的制备及应用研究进展

Ｆｅ３Ｓｉ基合金具有优异的软磁性能,不仅有希望硅钢片（在高频信息领域）,而且还广泛用作音几视频磁头材料和卡片阅读器用磁头材料。本文综述了Ｆｅ３Ｓｉ基合金的制备工艺及应用,并结合我们的研究工作,分析了其研究现状,简要论述了其发展前景。