材料期刊网

SUPERPLASTICITY IN SiCw／ZK60 COMPOSITE

F.Yan , K.Wu , M.Zhao

金属学报(英文版)

The superplastic deformation behavior of SiCw/ZK60 composite was investigated at temperatures ranging from 573K to 723K and at initial strain rates ranging from 8.3× 10^-4s^-1 to 8.3×10^-2s^-1.A maximum elongation of 200 138325116th a m-value of 0.35 was obtained at 613K and a initial strain rate of 1.67×10^-2s^-1.The apparent activation energy(98kJ/mol)approximates that for grain boundary diffusion(92kJ/mol)in magnesium.It is proposed that the dominant mechanism of superplastic deformation in the present composite is grain boundary sliding accommodated by diffusional transport,besides,interfacial sliding plays an important role in the superplastic deformation.

关键词: magnesium matrix composite , null , null

小角度直线反走样的改进Wu算法

李铂 , 周建江 , 夏伟杰 , 吴连慧

液晶与显示 doi:10.3788/YJYXS20142904.0605

直线是机载座舱显示画面中最基本的图元,其显示质量对于整个画面的显示效果影响较大,尤其是小角度下直线显示的“麻花”现象一直是影响显示效果的关键问题之一.为了提高小角度下直线的显示效果,本文提出了一种基于Wu算法的亮度渐变改进算法.该算法通过渐进地展现直线从轴方向上的亮度变化过程,减少亮度畸变,有效地改进了显示效果.通过Matlab仿真和FPGA实现,验证了该算法反走样后的小角度直线显示效果明显优于其他算法,而且结合中点画线法后,绘制时间与Wu算法相当.同时该算法还可改善大角度直线和圆弧的显示效果,消除了大角度直线的边缘锯齿,解决了圆弧在小角度部分的虚化问题.因此本文算法可用于对实时性和显示效果要求高的机载座舱显示系统,以缓解飞行员的视觉疲劳.

关键词: 座舱显示 , 反走样 , 改进Wu算法 , 小角度 , FPGA实现

基于Wu反走样的三角形光栅化边缘反走样算法

吴连慧 , 周建江 , 夏伟杰 , 陈雅雯

液晶与显示 doi:10.3788/YJYXS20153001.0163

对于光栅化的三角形,其边缘存在明显的锯齿现象,因此需要进行反走样处理.基于Wu直线反走样算法的思想,考虑了水平直线外侧直接添加插值点的算法和三角形三边外侧反走样的算法.综合两者的优点,在绘制光栅化的三角形的同时,边缘叠加Wu反走样直线,并考虑背景像素灰度值的作用.结果表明,改进的三角形光栅化的边缘反走样算法有效提高了三角形光栅化后边缘的显示效果,该算法计算量小,便于FPGA实现,可用于对图形显示质量要求很高的机载显示系统.

关键词: 反走样 , Wu算法 , 光栅化 , FPGA

碳酸钙粒子增韧高密度聚乙烯的脆韧转变——Wu氏增韧理论聚合物共混物脆韧转变判据的适用条件

胡跃鑫 , 冯玉林 , 姜伟

应用化学 doi:10.3724/SP.J.1095.2011.00521

采用不同尺寸的碳酸钙粒子增韧高密度聚乙烯,研究了不同温度下共混体系的临界粒子间距与碳酸钙粒子尺寸和含量之间的关系,确定了温度是Wu氏增韧理论临界粒子间判据适用性的重要影响因素.结果表明,在17℃下,临界粒子间距与碳酸钙粒子的尺寸和含量无关,该条件下Wu氏增韧理论临界粒子间距判据是适用的;而随着温度的升高,发现临界粒子间距依赖于碳酸钙粒子的尺寸,表明高温条件下,Wu氏增韧理论临界粒子间距判据不再适用.

关键词: 聚合物增韧 , 粒子间距 , 脆韧转变

K金首饰走俏市场

黄晓霞

黄金 doi:10.3969/j.issn.1001-1277.2004.11.018

以金合金为基体材料或镶嵌各种人工合成宝石而加工制作的K金首饰在颜色、品种、款式等方面都优于纯金首饰,并随着设计及加工工艺水平的不断提高,K金首饰以其个性化、艺术化的创意在市场的份额越来越大.

关键词: 纯金首饰 , K金首饰 , 款式 , 首饰设计 , 制造工艺

K*(892)电磁质量反常

闫沐霖

原子核物理评论 doi:10.3969/j.issn.1007-4627.2001.04.010

电中性的K(892)电磁质量可以大于带电荷的K(892). 这是异乎寻常的现象, 将被称为K-电磁质量反常. 评述了这个课题, 并指出K的质量劈裂可以在北京谱仪(BES)上作精密测量.

关键词: 电磁质量劈裂 , BES实验 , 介子共振态

K-cor夹层结构制备工艺

段沐枫 , 李宁 , 郑莹莹 , 肖军 , 李勇

宇航材料工艺

K-cor是应用Z-pin增强技术的一种新型高性能结构.本文以NHZP-1树脂为基体研究适合K-cor结构的半固化Z-pin拉挤工艺,得到固化度为51.25％的Z-pin为满足制备要求的最佳参数,并制作悬空装置采用两步法进行半固化Z-pin的植入和压弯,探索出压弯和后固化工艺.在此基础上,对试制的K-cor夹层结构进行平拉和剪切试验研究.结果发现,折弯长度是K-cor夹层结构的另一重要参数,较长的折弯长度会增加Z-pin与蒙皮的结合面积从而提高结构的拉伸性能.

关键词: 复合材料 , 半固化Z-pin , K-cor夹层结构 , 制备工艺 , 力学性能

(da)/(dN)与K_1间关系的探讨

陈篪

金属学报

本文证明我们所建议的关系: (da/dN)-C[(△K)~2-K_2~2/K_1~2-(△K)~2]~p能够很好地表达R=(K_(min)/K_(max))=常数时(da/dN)随△K的全部变化,其中P值在1左右,C约在3×10~(-3)—10~(-2)毫米/周之间。

关键词:

Electronic structure and transport properties of K-doped blue bronze Rb0.15K0.15MoO3

Materials Letters

Single crystals of K-doped blue bronze Rb0.15K0.15MoO3 and Rb0.3MoO3 have been investigated by measurements of the X-ray photoemission spectrum (XPS), electrical resistivity and thermoelectric power, respectively. Analysis of the XPS data reveals that two final states representing alternate screening channels coexist in Rb0.15K0.15MoO3. Compared with the pure bronze, the Mo sites of the doped sample contain less 4d electrons which reflected in the movement of Mo3d spectrum. Due to the discrepancy of electronic structure, the K ion doping results in the notable increase of the single particle activation energy and decrease of the thermoelectric power in the charge density wave state. (C) 2007 Elsevier B.V. All rights reserved.

关键词: blue bronze;charge-density-wave;electronic structure;nonlinear transport;k0.30moo3;tl0.3moo3;k0.3moo3;moo3

The effect of yttrium addition on the isothermal oxidation behavior of sputtered K38 nanocrystalline coating at 1273 K in air

Surface & Coatings Technology

The influence of various amounts of Y addition on the isothermal oxidation behavior of sputtered Ni-based superalloy K38 nanocrystalline coating at 1273 K was investigated. The result indicated that the addition of 0.05 and 0.1 wt.% Y in nanocrystalline coating enhanced the selective oxidation of Al, reduced scale growth rate and retarded the phase transformation from metastable to stable alumina. In contrast, 0.5 wt.% Y addition significantly increased the oxidation rate of the coating, the incorporation of Ti in the external alumina scale accelerated the phase transformation to stable alumina. (C) 2007 Elsevier B.V. All rights reserved.

关键词: high temperature oxidation;nanocrystalline coating;reactive-element;superalloy;high-temperature oxidation;oxide scales;percent y2o3;alloys;k38g;superalloy;resistance;diffusion;corrosion;growth