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Simultaneous Thermoluminescence and Thermally Stimulated Current in Polyamide

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Journal of Materials science & technology 1998年第4期14卷 357-360页

作者： Fan, Yong Wang, Xuan Zhang, Xiaohong Lin, Jiaqi Lei, Qingquan harbin univ sci & technol Dept Elect Mat Engn Harbin 150040 Peoples R China

The simultaneous thermoluminescence (TL) and thermally stimulated current (TSC) spectra were obtained in two types of polyamide film, such as nylons 6 and 11 under study of electron detrapping and recombination. There are three main relaxation peaks or regions, designated gamma , beta and alpha in order of increasing temperature in the TSC spectra, in contrast, a high temperature relaxation peak in TL spectra disappears. The centers of peaks of these relaxation regions are located at near 180, 230 and 310 K, respectively, deviating plus or minus 10 K. However, two anomalous phenomena were observed: firstly, a very large, short-circuited, thermally stimulated discharge current (TSDC) is up to 10** minus **8A, but reversible in direction for non-polarized nylons 6 and 11, even after several times repeatedly; secondly, there is no TL signal except for non-polarized nylon 6 film. (Edited author abstract) 11 Refs.

关键词： Polyamides

Copper Matrix Composites Reinforced with Nanometer Alumina Particle

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Journal of Materials science & technology 1999年第2期15卷 143-146页

作者： Wu, JJ Li, GB Zhang, Y Jiang, ZX Lei, TQ Hebei univ technol Dept Mat Sci & Engn Tianjing 300130 Peoples R China harbin Inst technol Harbin 150006 Peoples R China

The microstructure and properties of the oxide particle dispersion strengthened composite fabricated by internal oxidation method have been studied. Using nitrogen base atmosphere and a new process flow we can improve the quality of the MMCs and decrease the cost of the composites. The size of alumina is in the nanometer order of magnitude and the particles are well distributed. Under the condition of having good electrical conductivity, the composites have 1 to 2 times higher mechanical properties than those of pure Cu.

关键词： Metallic matrix composites

Semi-solid extrusion of TiC_p/2024Al composites prepared by contact reaction method

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中国有色金属学会会刊：英文版 2000年第3期10卷 304-308页

作者： LUO Shou jing(罗守靖) ZU Li jun(祖丽君) harbin Inst technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The contact reaction method was employed to prepare TiC p/2024Al composites and the semi solid extrusion was employed to manufacture composite rods. Through many experiments, suitable processing parameters were obtained, under which sound rods can be fabricated. It is found from the extrusion pressure—stroke curves of semi solid extrusion that the deformation force during semi solid extrusion is low and steady. The reason for lower extrusion pressure of semi solid extrusion was given. Some fabrication defects, such as break out and excessive extrusion force, owing to the inappropriate selection of processing parameters were also observed. The microstructures of TiCp/2024Al composites are characterized by well densified matrix, uniformly distributed TiC particles, some banded particle clusters and realignment of TiC particles along the extrusion direction, and no fracture of TiC particles. The mechanical properties of TiC p/2024Al composites are much higher than those of unreinforced alloy. In the meantime, the elongations of the composites are maintained at the level enough for practical applications.

关键词： TiC p/2024Al semi solid extrusion microstructure mechanical properties

Microstructure of Rapidly Solidified Al-3.8Li-0.8Mg-0.4Cu-0.13Zr Alloy by Spray Deposition Processing

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Journal of Materials science & technology 1998年第5期14卷 407-410页

作者： Cui, Chengsong Fan, Hongbo Xu, Daming Jiang, Zuling Li, Qingchun harbin Inst technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The grains are 5-20 mu m in size, and the microstructure exhibits the rapid solidification merits. Shrinkage porosities have been avoided, and the formation of prior particle boundary has been prevented to a large extent. But there still exist some micropores with various shapes. The relative density of the as-deposited material is 94% on average. The main precipitates in the tested alloy are delta (AlLi), S(Al//2CuMg) and delta prime (Al//3Li) phases. (Edited author abstract) 10 Refs.

关键词： Aluminum alloys

Key technologies of numerical simulation of cup hydrodynamic deep drawing

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中国有色金属学会会刊：英文版 2000年第6期10卷 772-776页

作者：郎利辉康达昌张士宏戴昆王仲仁苑世剑 harbin Inst technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

A math formula about the relation between fluid pressure after overflowing and punch stroke that can be applied in general FEM software was proposed. It is proved that theoretical results keep coincident to experimental results and the method to simulate hydrodynamic deep drawing process that integrates general FEM software with mathematical description is feasible. [

关键词： hydrodynamic deep drawing fluid pressure F

Shape Memory Effect of an Aged Fe-Mn-Si-Co-Mo Alloy

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Journal of Materials science & technology 1998年第2期14卷 182-184页

作者： Wang, Zhong Cai, Wei Zhao, Liancheng harbin Inst technol Sch Mat Sci & Engn Harbin 150001 Peoples R China

The effect of ageing on the microstructure, mechanical properties and shape memory effect (SME) in a newly developed Fe-24Mn-5Si-8Co-4Mo shape memory alloy has been studied. It was found that Fe//2Mo particles precipitate during ageing and thereby increase hardness and strength of the alloy. The SME of the alloy can be remarkably improved by ageing, and a maximum SME can be obtained when aged at 873 K. When the ageing temperature is over 873 K, the SME decreases with increasing the ageing temperature. The reason for the improvement of SME by ageing in the Fe-Mn-Si-Co-Mo alloy was discussed. (Edited author abstract) 9 Refs.

关键词： Shape memory effect

EFFECT　OF　TRANSITION　METAL　Ni　ON　WELDING　PROPERTIES　OF　TITANIUM　ALLOY　STAINLESS　STEEL

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中国有色金属学会会刊：英文版 1997年第1期7卷 71-75页

作者： Sun, RL Meng, XC Zhang, JH harbin INST technol SCH MAT SCI & ENGNHARBIN 150001PEOPLES R CHINA

ＥＦＦＥＣＴＯＦＴＲＡＮＳＩＴＩＯＮＭＥＴＡＬＮｉＯＮＷＥＬＤＩＮＧＰＲＯＰＥＲＴＩＥＳＯＦＴＩＴＡＮＩＵＭＡＬＬＯＹＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＳｕｎＲｏｎｇｌｕ，ＭｅｎｇＸｉａｎｇｃａｉＳｅｃｏｎｄＤｅｐａｒｔ... 详细信息

ＥＦＦＥＣＴＯＦＴＲＡＮＳＩＴＩＯＮＭＥＴＡＬＮｉＯＮＷＥＬＤＩＮＧＰＲＯＰＥＲＴＩＥＳＯＦＴＩＴＡＮＩＵＭＡＬＬＯＹＳＴＡＩＮＬＥＳＳＳＴＥＥＬ①ＳｕｎＲｏｎｇｌｕ，ＭｅｎｇＸｉａｎｇｃａｉＳｅｃｏｎｄＤｅｐａｒｔｍｅｎｔ，ＪｉａｍｕｓｉＩｎｓｔｉ...

关键词： Ti alloy stainless steel transition metal Ni diffusion welding

ISOTHERMAL PRECISION FORGING PROCESS OF ALUMINUM ALLOY CYLINDRICAL HOUSING

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中国有色金属学会会刊：英文版 1997年第3期7卷 124-127页

作者： Wang, Z Xue, KM Shan, DB Xu, FC Lu, Y harbin INST technol SCH MAT SCI & ENGNHARBIN 150001PEOPLES R CHINA

ＩＳＯＴＨＥＲＭＡＬＰＲＥＣＩＳＩＯＮＦＯＲＧＩＮＧＰＲＯＣＥＳＳＯＦＡＬＵＭＩＮＵＭＡＬＬＯＹＣＹＬＩＮＤＲＩＣＡＬＨＯＵＳＩＮＧ①ＷａｎｇＺｈｅｎ，ＸｕｅＫｅｍｉｎ，ＳｈａｎＤｅｂｉｎ，ＸｕＦｕｃｈａｎｇ，ＬｕＹ... 详细信息

ＩＳＯＴＨＥＲＭＡＬＰＲＥＣＩＳＩＯＮＦＯＲＧＩＮＧＰＲＯＣＥＳＳＯＦＡＬＵＭＩＮＵＭＡＬＬＯＹＣＹＬＩＮＤＲＩＣＡＬＨＯＵＳＩＮＧ①ＷａｎｇＺｈｅｎ，ＸｕｅＫｅｍｉｎ，ＳｈａｎＤｅｂｉｎ，ＸｕＦｕｃｈａｎｇ，ＬｕＹａｎＳｃｈｏｏｌｏｆＭａｔｅｒｉａ...

关键词： aluminum alloy isothermal precision forging assembled die heating range

Properties of Aluminum Oxide (AlO_x) Barrier Coatings Deposited on Poly(Ethylene Terephthalate)(PET)Substrates by Reactive Magnetron Sputtering

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稀有金属材料与工程 2012年第S1期41卷 268-271页

作者： Liu Zhuang Ma Xinxin Sun Zhihui Xu Fangjun harbin Inst technol Sch Mat Sci & Engn Harbin 150001 Peoples R China harbin univ Commerce Harbin 150028 Peoples R China

The aluminum oxide(AlOx)coatings were deposited on poly(ethylene terephthalate)(PET)surface by reactive magnetron sputtering for improving its barrier *** O2 flux increasing,three modes including metallic mode,transition mode and oxide mode exist in *** properties of the aluminum oxide(AlOx)coatings prepared at different modes were ***,the influences of oxygen flux on the stoichiometry,structure,gas permeation of the coatings were *** chemical composition of AlOx films fabricated in transition mode is different as oxygen flux varies slightly,and the gas barrier property is better as the stoichiometry is closer to 1.5 with oxygen flux *** coating uniformity,roughness and particle size depend remarkably upon oxygen *** coatings deposited at oxide mode have a good barrier performance to oxygen and water,and the permeability to oxygen decreases by sixty times and water vapor ten times compared with uncoated

关键词： permeation barrier aluminum oxide magnetron sputtering poly(ethylene terephthalate)(PET)