Jing BI Zongyi MA Shengjin WU Yuxiong LU Hongwei SHEN Institute of Metal Research
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Academia Sinica
,
Shenyang
,
110015
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China
材料科学技术（英文）
The microstructure and tensile properties of Al_4C_3 dispersion strengthened Al composite fabricated by reaction milling technique were investigated.It is indicated that the rod-like Al_4C_3 dispersoids having a diameter of 0.02-0.03 μm and a length of 0.1-0.3μm are formed by reaction of C with Al, and uniformly distributed in the Al matrix.The interface between Al_4C_3 and Al is clean and the interfacial bonding is good.The matrix consists of the subgrains which have the size of 0.3-0.4μm, and most of the Al_4C_3 dispersoids are distributed on the subgrain boundaries.The 11 vol.-% Al_4C_3/Al composite exhibits an UTS (ultimate tensile strength) of 400 MPa and an elongation-to-failure of 8.0%.
关键词:
Al composite
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null
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null
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null
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null
MA Zongyi YAO Zhongkai Harbin Institute of Technology
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Harbin
,
China
金属学报(英文版)
The SiC_w/Al composite prepared by squeeze casting has a combination of superior room temperature specific strength and modulus together with excellent thermal properties.The extrusion can make an improvement on the strength and ductility of the composite from 582 MPa as squeeze casted up to 639 MPa,and on the transformation from isotropic to the anisotropic structure.This seems to be explained by the orientation of whiskers and the densification of dislocations in matrix.TEM observation indicates that the stacking fault is the usual planar defect on the SiC_w surface. composite;;SiC whisker;;Al alloy;;microstructure
关键词:
composite
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null
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null
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null
郭如旺
,
郭常新
中国稀土学报
采用共沉淀法和燃烧法分别制备得到纳米和亚微米的Lu2O3∶Bi3+的粉末晶体. 立方结构, 属Ia3-[206]空间群, 晶格常数a＝1.039 nm, 密度高达9.4 g·cm-3. 利用XRD, TEM, 荧光光谱和阴极射线发光等方法, 研究了不同的制备方法和条件对制成样品的结构、形貌、发光亮度、光谱以及余辉的影响. 两种方法制得的样品在紫外和阴极射线激发下, 有亮度较高的兰青色的发光. 余辉较短, 衰减曲线是单指数型.
关键词:
Lu2O3:Bi3+
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发光
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纳米
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共沉淀法
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燃烧法
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稀土
刘文鹏
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张庆礼
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杨华军
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周鹏宇
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孙敦陆
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高进云
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谷长江
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罗建乔
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王迪
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殷绍唐
量子电子学报
doi:10.3969/j.issn.1007-5461.2011.02.018
采用固相反应法制备了Bi3+、Eu3+、Tb3+掺杂的Lu3TaO7.测量了样品的X射线衍射谱、激发和发射光谱及荧光衰减曲线.三种离子掺杂的Lu3TaO7均呈现出强的荧光发射,其中Bi3+具有峰位在431 nm处的一强发射宽带,衰减寿命为16.8μs,Eu3+、Tb3+则表现出稀土离子的特征锐发射峰,衰减寿命分别为1.26 ms和1.20 ms.因此,它们均是具有潜在应用前景的重闪烁体材料.
关键词:
材料
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闪烁体
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Lu3TaO7
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发光
Journal of Magnetism and Magnetic Materials
Magnetization curves of the ternary tetragonal compound Lu2Fe14C were measured in an extracting-sample magnetometer in the temperature range from 1.5 to 300 K. The temperature dependence of the magnetic properties of Lu2Fe14C is discussed.
关键词:
anisotropy
Corrosion
This paper introduces the design of a localized corrosion rate monitoring instrument that can monitor and evaluate the maximum and stable localized corrosion rate of a nonpassivable metal in a corrosive environment by measuring the current density in a corrosion sensor with an occluded anode.
关键词:
instrument;localized corrosion rate;monitor
李佳
,
张忻
,
路清梅
,
张久兴
,
卫群
功能材料
机械合金化与放电等离子烧结技术(SPS)相结合制备了p型(Bi,Sb)2Te3合金块体.在300～423K的温度范围内测试了样品的电导率﹑Seebeck系数和热导率.系统研究了球磨时间对合金化与热电性能的影响.球磨2h的样品具有最低的热导率,因此其ZT值最高,在323K时为1.16,在373K达到最大值1.23.
关键词:
热电材料
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机械合金化
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放电等离子烧结(SPS)
李铂
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周建江
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夏伟杰
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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
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反走样
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改进Wu算法
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小角度
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FPGA实现
