FA N Ruilin Institute of Aeronautical Materials
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Beijing
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China
金属学报(英文版)
The high-cycle fatigue performance of different microstructures of aluminide coating- superalloy system has been studied at 900℃.The single phase coating of coarse equiaxial grain NiAI(β)has unfavorable eJfect onJatigue life of the coating-superalloy.The fatigue life may shorten if the coating of NiAl(β)was an enrichment of coarse refractory metal grains. While an improvement can be made by dispersing numerous secondary phase particles such as extreme.fine γ′,quasi-σ-phase and others.
关键词:
aluminide coating
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null
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null
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null
TANG Changguo
,
ZHU Jinhua
,
ZHANG Yuhua
,
ZHOU HuijiuResearch Institute for Strength of Metals. Xi'an Jiaotong University. Xi'an. China
金属学报(英文版)
Variable strain rate tension tests for 4 metallic materials show that as the strain rate in creases the strain hardening exponent n decreases. The trend follows a two stage linear relation between n and Ig (?). When (?) < (?)cp, i.e. under quasi-static loading, n can be considered as a constant, but when (?)>(?)cp, n decreases rapidly till an ideal plastic state. n = 0. The characterizations and mechanisms of softening induced by high (?) are discussed.
关键词:
strain rate
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null
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null
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null
李尊
,
吴谨
,
刘劲
,
吴秋红
液晶与显示
doi:10.3788/YJYXS20153002.0353
在经典 Criminisi 图像修复算法框架的基础上，针对优先权可靠性低和全局搜索最佳模板效率低、错误匹配率大的缺点进行改进。改进的算法为基于萤火虫算法(FA)的快速 Criminisi 图像修复算法。首先从数学的角度引入正规化函数至置信度，以此提升优先权计算的可靠性；然后引入 FA 到最佳模板的搜索与填充中，能够有效地将全局搜索与局部搜索有效地结合，鲁棒性较高，提高效率且错误匹配率低。实验结果表明：采用本文的改进算法能在保证修复质量的基础上降低时耗，提高效率。
关键词:
Criminisi算法
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优先权
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最佳匹配模板
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FA
International Journal of Hydrogen Energy
A systematic investigation on the hydrogen storage properties of Li-Mg-N-H materials with various compositions was performed. Li-Mg-N-H hydrogen storage materials were prepared by mechanically milling LiNH2/MgH2 mixtures with initial molar ratios ranging from 1.5:1 to 3: 1, followed by de/rehydriding at 200 degrees C. It was found that the hydrogen storage capacity of the system was highly dependent on the initial phase ratio of the LiNH2/MgH2 mixture. An optimum hydrogen capacity of about 5 wt% was achieved in the 2.15:1 LiNH2/MgH2 mixture. Different carbon materials, such as the single-walled carbon nanotubes (SWNTs), multi-walled carbon nanotubes, graphite and activated carbon, were used as additive to improve the hydrogen storage performance. It was found that the dehydriding kinetics of the Li-Mg-N-H material could be markedly improved by adding a small amount of SWNTs, especially in the as-prepared state. (c) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
关键词:
hydrogen storage;dehydriding kinetics;carbon nanotubes;arc-discharge method;system;microstructure;desorption;absorption;behaviors;property;imides
B.W. Wang
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H. Shen
金属学报(英文版)
Ni-Cr System solar selective thin solid films were prepared by d.c. magnetron reactivesputtering under the atmosphere of O2 and N2. Ni-Cr alloy was chosen as targetmaterial and copper sheets as substrate. Using SEM, Spectrophotometer and Talystepto analyze the relations between the selective characteristic and the structure, theformation and the thickness of the thin films. The aim is to obtain good solar selectivethin films with high absorptance and low emittance, which is applied to flat plate solarheat collectors.
关键词:
solar selective thin film
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null
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null
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null
Journal of Applied Physics
Amorphous BC2N powders were prepared by mechanical milling with hexagonal boron nitride and graphite as starting materials. A bulk amorphous BC2N compound was produced by sintering the as-milled amorphous BC2N powders in a vacuum of 10(-5) Torr at a temperature of 1470 K. The conductivity measurement for the bulk amorphous BC2N compound showed that it behaves as a semiconductor with band gap energy of 0.11 eV for temperatures ranging from room temperature to 560 K and a semimetal for temperatures between 560 and 740 K. The mechanism of the formation of the amorphous BC2N powders is discussed. (C) 1998 American Institute of Physics.
关键词:
bc2n
周筠
,
吴勇生
,
李如燕
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孙可伟
,
王敏
硅酸盐通报
以粉煤灰(FA)、铸造旧砂热法再生粉尘(DHRS)为原料,在水玻璃型碱性激发液的激发作用下研究制备了DHRS-FA地质聚合物材料(铸造旧砂热法再生粉尘-粉煤灰基地质聚合物材料).为了探讨不同的养护工艺对DHRS-FA地质聚合物材料强度的影响,研究了自然养护、湿养养护、高温蒸养(40℃、60℃、80℃)养护对地质聚合物强度的影响.结果表明:试样在高温养护工艺下,其早期抗压强度形成较快,且优于自然养护和湿养养护工艺下试样形成的抗压强度;试样在高温养护工艺下,中期和后期抗压强度趋于自然养护试样的抗压强度;而湿养条件下养护的试样抗压强度最差.
关键词:
粉煤灰
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铸造旧砂热法再生粉尘
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地质聚合物材料
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高温养护工艺
