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composites
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  复合材料
    The Constitutive Relations of Shape Memory Alloys and Its Composites
    形状记忆合金及其复合材料的本构关系
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    The Research on Machinability of Al_2O_(3f)+C_f/ZL109 Hybrid Composites
    Al_2O_(3f)+C_f/ZL109混杂复合材料的切削加工性研究
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    Research on Welding Technology and Mechanism of Particulate Reinforced Aluminium Metal Matrix Composites
    颗粒增强铝基复合材料焊接工艺与机理研究
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    Soil Adhesion and Abrasive Wear of PTFE-Matrix Composites
    PTFE基复合材料的土壤粘附与磨料磨损的研究
短句来源
    A Development Study of Surface Wear-resistance Composites with Ferrite-based SiC Ceramic Particles
    铁基SiC陶瓷颗粒表面耐磨复合材料的研制
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    Study of Polyaniline/Montmorillonite Composites Anticorrosion Coatings
    聚苯胺/蒙脱土复合防腐蚀涂层的制备及性能研究
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    Study on Producing Method of As-Cast Mid-Maganese Steel Matrix Composites Reinforced by A1_2O_3 Particles
    Al_2O_3颗粒—中锰钢铸造材料工艺方法
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    Investigation on Oxidation Protection of Carbon/Caobon Composites for Aircraft Brake Discs
    飞机碳/碳复合刹车材料氧化防护性能研究
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    Fabrication of Al-SiCp Composites By Vacuum-high Pressure Infiltration Method
    真空压力浸渗法制备SiCp/Al的研究
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    The InfIuence of NI Layer on the Composites Structure and Bonding Strength of Pd-30Ag-14Cu-10Au-10Pt-1Zn/Cu-2Be
    镍层对Pd-30Ag-14Cu-10Au-10Pt-1Zn/Cu-2Be复合结构及强度之影响
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  composites
In this paper, the so-called approximate convexity and concavity properties of generalized Gr?tzsch ring function μα(r) by studying the monotonicity, convexity or concavity of certain composites of μα(r) are obtained.
      
Preparation and properties of polymer and quantum dot composites
      
The prepared composites were characterized with UV-Vis, PL, TEM, FTIR, CLSM and conductance titration etc.
      
Spectra results indicated that there existed interactions between nanocarbon and the polymethyl methacrylate (PMMA) matrix, which was consistent with the decrease in glass transition temperature of the composites with increase of carbon content.
      
TEM images revealed that a carbon encapsulated core/shell structure was formed in the composites, which could ensure good dispersion of carbon nanoparticles within the PMMA matrix.
      
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The high-grade binary broze alloy with high tin content is necessary for manufac turing the superconducting multifilamentary Nb_3Sn composites by the bronze process. In order to optimize the Process Parameters and then improve the Performances of the compsites, it is necessary to investigate the Properties for the binary broze alloy.In this Paper a thorough study are Presented on the homogenization of casting, coldhardening' annealing for softening and the Plasticities for the broze alloy (With an emphasi...

The high-grade binary broze alloy with high tin content is necessary for manufac turing the superconducting multifilamentary Nb_3Sn composites by the bronze process. In order to optimize the Process Parameters and then improve the Performances of the compsites, it is necessary to investigate the Properties for the binary broze alloy.In this Paper a thorough study are Presented on the homogenization of casting, coldhardening' annealing for softening and the Plasticities for the broze alloy (With an emphasi osn the alloy containing Cu-13~14%Sn) and the results are discussed.

采用“青铜法”制迄多纤维Nb_3Sn超导材料需要优质二元高锡青铜作基体。为制订高锡青铜和多纤维Nb_3Sn线材的最佳制作工艺,提高超导特性,本文研究了二元高锡青铜(主要是Cu—13~14%Sn合金)的铸锭均匀化制度、合金的硬化特性、软化特性以及塑性,并就研究结果进行了讨论。

The elastic inclusion problem, that is the calculation of the stress-strain field and the elastic energy of an anisotropic elastic medium with an elastic inclusion contained in it, is one of the important problems in materials science.Especially, the variation of the elastic energy of the system with the orientations of the inclusion in the medium (i. e. the orientational dependence of the elastic energy), and the orientation of the inclusion corresponding to the minimum of the elastic energy of the system are...

The elastic inclusion problem, that is the calculation of the stress-strain field and the elastic energy of an anisotropic elastic medium with an elastic inclusion contained in it, is one of the important problems in materials science.Especially, the variation of the elastic energy of the system with the orientations of the inclusion in the medium (i. e. the orientational dependence of the elastic energy), and the orientation of the inclusion corresponding to the minimum of the elastic energy of the system are of great theoretical land practical significance in the investigations of the habit orientations of the phase transformations and precipitate particles, the prediction of the microcracking direction as well as the optimum distribution of the reinforcement fibers in the composites.Based on the "Point Force-Line Force Method" given by H. Y. Yang and Y.T. Chou in 1976, a general computer program is compiled, which is applicable to the numerical calculation of the elastic energy of the elliptical inclusion oriented in any direction of the anisotropic medium for the generalized plane problem. The values of the elastic energy of the elliptic inclusions with their cylinder axes along the <100>, <110> and <111> directions in cubic metals Fe, Nb and Al were computed, and the dependence of elastic energies on the orientation of cross elliptic sections, which was rotating around their cylindcr axes, has been illustrated explicitly in graphic charts.The following conclusions arc deduced from the calculation results:1. The system has its elastic energy when the inclusion is lying on the crystal planes and oriented along the crystal directions of low indexes.2. The elastic energy of the system with the inclusion subjected to pure shear strain is 1/3-1/2 of that with the inclusion subjected to principal strain.3. The elastic energy of the anisotropic system with thin plate inclusions is very small. As the elliptic index e=b/a→0 the elastic energy of the system approaches nil.4. If the boundary energy could be neglected, the new phase and the precipitate with the lowest elastic energy would take the thin plate shape and shear mode in phase transformations and precipitation.

本文编制了各向异性介质中椭圆柱形夹杂物弹性能数值计算的通用程序。计算了立方晶系中<100>,<110>和<111>方向夹杂物的弹性能,给出了三种夹杂物的弹性能方位分布曲线,并讨论了夹杂物形状和应变状态等因素对体系弹性能的影响。

The influence of structures on fracture and fracture toughness was investigated for conventional WC-Co composites with different volume fraction of cobalt (7-30%) and grain size of tungsten carbide (0.5-3.5μm). The fracture toughness of the alloys was measured on single-edge notched beam and cracked beam specimens. The microsturctural parameters and the proportion for each fracture mode on the fracture surface were obtained by stereo-metallography. It is shown that the fracture toughness of the alloys...

The influence of structures on fracture and fracture toughness was investigated for conventional WC-Co composites with different volume fraction of cobalt (7-30%) and grain size of tungsten carbide (0.5-3.5μm). The fracture toughness of the alloys was measured on single-edge notched beam and cracked beam specimens. The microsturctural parameters and the proportion for each fracture mode on the fracture surface were obtained by stereo-metallography. It is shown that the fracture toughness of the alloys mainly depends on the volume fraction, destribution and the mean free path of cobalt phase. Based on the fracture analysis, the equation GIC=(0.417-0.457)σSλ was obtained. The brittle fracture of the alloys is probably due to interfacial decohesion along WC-WC interface and WC cleavage. The relation between the percentage of WC/WC interfacial decohesion on the fracture surface and structural parameters is (F)wc/wc=r (1-VCo)2/Dwc. The experiments show that the determination of the fracture foughness of WC-Co alloys can be carried out on single-edge notched beam specimens. The dependence of the critical strain energy release for single-edge notched beam and cracked beam specimens is given by GIC(P)= GIC+2.1p

本文研究了钴含量7~30%(体积)、WC晶粒度0.5~3.5μm范围内常规WC-Co硬质合金组织结构对断裂韧性和断裂的影响。采用缺口和裂纹两种试样测定合金的断裂韧性;用体视金相学方法铡定合金的显微组织结构参数,并统计了断裂模式的分布。结果表明:合金的断裂韧性主要取决于钴的含量、分布及钴相平均自由程。根据断裂过程分析,导出裂纹扩展能量释放率与组织结构间的关系式为:G_(IC)=(0.417~0.457)σ_sλ。该类合金脆断的主要微观原因是WC/WC型晶间开裂和WC晶粒穿晶断裂。断口表面,WC/WC型晶间开裂分数与组织结构间的关系为:(F)_(WC/WC)=γ(1-V_(Co))~2/D_(WC)。试验表明,合金的断裂韧性采用缺口试样进行测定是可行的,缺口和裂纹两种试样能量释放率间的关系为:G_(IC(ρ))=G_(IC)+2.1ρ。

 
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