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high specific stiffness
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  高比刚度
     Composite laminated thin-walled structures are widely used in aerospace and aeronautic structures due to weight-light, their high specific strength, high specific stiffness, fatigue resistance and flexibility in design.
     复合材料层合结构由于重量轻、比强度高,比刚度大、耐疲劳性和铺层可设计性好等优点,广泛地应用于航空和航天领域上。
短句来源
     SiCp/AI composites have been receiving much attention in recent years because of its high thermal conduction、 low coefficient of thermal expansion, low density, high specific stiffness, high specific strength.
     SiCp/Al复合材料具有高导热、低膨胀、低密度、高比刚度、高比强度等特点,在近年来受到越来越多的重视。
短句来源
     TiAl alloys have specialties of low density,high specific strength,high specific stiffness,high elastic modulus,good corrosion resistance and creep resistance at high temperature. So,they become a kind of potential high-temperature structural material for the fields of aeronautics & astronautics,gas turbine and automobile industries.
     TiAl合金具有低密度、高比强度、高比刚度、高弹性模量、耐腐蚀和高温抗蠕变性好等优点 ,成为航空航天、工业燃气轮机以及汽车工业中最具潜力的高温结构材料 .
短句来源
     The results show that at 940 K and during the stirring time period of 30~80 s, the porosity of the Al alloy melt foam is kept constant while the pore number increases and pore diameter decreases, which is a new method to fabricate Al alloy foam with high specific stiffness, low porosity and small pore diameter.
     结果表明 :在94 0K时 ,发泡剂氢化钛分解的 30~ 80s内 ,随着均匀分散时间的延长 ,铝合金熔体泡沫的孔隙率保持恒定 ,但孔数增多 ,孔径变小 ,由此获得了制备高比刚度、小孔径和低孔隙率泡沫铝合金的新途径。
短句来源
  高的比刚度
     MMC is a high performance material whose metal matrix is reinforced by ceramic particles or fibres (such as SiC, Al2O3, TiC, TiB etc. ) . MMC exhibits a high specific stiffness and strength, low wearrate, and good mechanical proprties at the elevated temperature.
     金属基复合材料是由陶瓷颗粒成纤维(如SiC,Al2O3,TiC,TiB等)增强金属或者合金基体而得到的,具有高的比刚度、比强度、耐磨性和高温性能,且具有可设计性,是一类高性能先进材料,在航空、航天、汽车等领域具有良好的应用前景。
短句来源
     MMC is a good performance material whose metal matrix is reinforced by ceramic particles or fibres (such as SiC, Al 2O 3, TiC and TiB, etc.) . It exhibits high specific stiffness and high specific strength, good wearability, as well as good mechanical properties at elevated temperature.
     金属基复合材料是由陶瓷颗粒或纤维 (比如SiC ,Al2 O3,TiC ,TiB等 )增强金属或者合金基体而得到的 ,具有高的比刚度、比强度、耐磨性和高温性能 ,且具有可设计性 ,是一类高性能先进材料 ,在航空、航天、汽车等领域具有良好的应用前景。
短句来源
  “high specific stiffness”译为未确定词的双语例句
     Rapidly solidified high temperature aluminum alloy AA8009 (Al-8.9Fe-1.3V-1.7Si) is a kind of lightweight structure materials with high specific strength, high specific stiffness and excellent heat-resistance. It is able to be applied to the aerospace and aircraft industries instead of some of titanium alloys or steels which are usually used at the temperature range of 150~350℃.
     快速凝固AA8009耐热铝合金(Al-8.9Fe-1.3V-1.7Si)是一种高比强、高比刚、热稳定性好的轻质结构材料,可在150~350℃(甚至更高范围内)替代钛合金或钢材使用。
短句来源
     According to this rule, a set of samples of Al alloy foam with small pore diameter (D<1mm) and low porosity (65%high specific stiffness, high apparent Young’s modulus and large compression energy absorption capacity, have been prepared successfully.
     据此规律,成功地制得了小孔径(D<1mm)、低孔隙率(65%
短句来源
     TiAl-based alloys have attracted much scientific research interest as ideal candidate materials for high temperature structural applications due to their low density, high specific strength, high specific stiffness and high temperature strength ratio.
     TiAl基合金密度低,比强度、比刚度高,且在高温下保持较高的强度和刚度,是很有前景的高温结构材料。
短句来源
     Reaction-bonded silicon carbide (RBSC) has high thermal conductivity, low CTE and high specific stiffness, which make it a promising mirror material, especially for applications such as space-borne optical systems.
     反应烧结碳化硅(RBSC)具有热导率高、热膨胀系数低、比刚度高等优良特性,特别适合于空间光学系统的应用,是一种具有广阔应用前景的反射镜材料。
短句来源
     Rapidly solidified high temperature aluminum alloy is a kind of lightweight structural materials with high specific strength, high specific stiffness and good heat-resistance.
     快速凝固耐热铝合金是一种高比强、高比刚、耐高温轻质结构材料,可在150-350℃(甚至更高)的温度范围内替代钛合金或钢材使用。
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  high specific stiffness
MMCs possess high-temperature capability, high thermal conductivity, low CTE, and high specific stiffness and strength.
      
From the onset of the space era, both organic-matrix and metal-matrix composites (MMCs), with high specific stiffness and near-zero coefficient of thermal expansion (CTE), have been developed for space applications.
      
They offer a high specific stiffness and strength, but a relatively low damping, which leads to intense acoustic radiation.
      
Due to their superior mechanical properties, such as low coefficients of thermal expansion and high specific stiffness, they are attractive for many structural and non-structural applications.
      
Such structures have a high specific stiffness because the separation of the faces by the lightweight core increases the moment of inertia of the section with little increase in weight.
      
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Metal based composites possesses the advantages of high specific strength,high specific stiffness,heat resistance and wear resistance,excellent thermal conductivity,conductibility and stability of size. This material can be not only used for manufacturing aerospace parts,but also be used widely for manufacturing civil products. This paper regards Japan as an example to introduce the development condition of manufacturing technology of metal composites.

金属基复合材料具有比强度高、比刚度高、耐热、耐磨损、导热、导电、尺寸稳定等优点,是一种很有发展前途的新材料,不仅可以用于制造航空航天零部件,而且可以广泛地用于制造各种民用产品。本文仅以日本为例,介绍金属基复合材料制造技术的发展概况。

This paper presented and reviewed the preparing methods, aging response and mechanical properties of Al-Li alloy matrix composite: (Al-Li MMCs). The Al-Li alloy with high specific stiffness and strength are promising new material in aerospace, instrument and automobile industry. It may be predicted that Al-Li MMCs are advantages over conventional Al MMCs in mechanical properties. Therefore, the investigation on Al-Li MMCs has great importance. The report of investigation on Al-Li MMCs is gradually increasing....

This paper presented and reviewed the preparing methods, aging response and mechanical properties of Al-Li alloy matrix composite: (Al-Li MMCs). The Al-Li alloy with high specific stiffness and strength are promising new material in aerospace, instrument and automobile industry. It may be predicted that Al-Li MMCs are advantages over conventional Al MMCs in mechanical properties. Therefore, the investigation on Al-Li MMCs has great importance. The report of investigation on Al-Li MMCs is gradually increasing. At present, Al-Li MMCs were prepared by powder metallurgy technique and rolling or extrusion, the reinforcer was SiC particle mainly.The modulus of prepared Al-Li MMCs is about 104GPa with acceptable ductility.

铝锂合金复合材料是目前铝锂合金研究的热点。本文重点介绍和评述了这种材料的主要制备方法、时效特性及目前达到的力学性能。

Particulate reinforced metal matrix composites (MMCp) have attracted considerable attention in the aerospace, aircraft and automotive industries due to their distinctive properties of high specific stiffness and strength, unique wear and erosion resistance, resisting high temperature creep, good ability of conventional fabrication processes. It is found that SiC particles received as abrasive grade cannot be incorporated and dispersed in ZA-27 alloy melt or semisolid slurry by the application of...

Particulate reinforced metal matrix composites (MMCp) have attracted considerable attention in the aerospace, aircraft and automotive industries due to their distinctive properties of high specific stiffness and strength, unique wear and erosion resistance, resisting high temperature creep, good ability of conventional fabrication processes. It is found that SiC particles received as abrasive grade cannot be incorporated and dispersed in ZA-27 alloy melt or semisolid slurry by the application of stirring casting processes. To overcome the difficulty and improve the wettability of SiCp and ZA-27 alloy melt, SiC particles must be pretreated and new pretreatment technology should be explored. Various pretreatment techniques are experimentally studied, including that SiC particles are soaked and cleaned in aqueous solution containing surface active agent at different temperatures, or immersed and stirred in the HF, NaOH and Na 2CO 3 at various concentrations, respectively, oxidized in air at 900?℃~950?℃, cleaned in organic solution by an ultrosonic machine and milled in the mixed solution of HF and acetone by a planetary milling machine. Experimental results show that the oxidation, cleaning and milling in acid solution and in organic solution are dominant processes, and the concentration of HF must be limited. Comparison with experimental results, it is the best pretreatment process in which SiC particles are oxidized at 920?℃ for one hour, then milled in mixed solution of HF and acetone and cleaned in acetone for an hour, respectively. Pretreated SiC particles will not be agglomerated each other before addition to the melt, and can be easily incorporated and dispersed in semi solid ZA-27 alloy slurry by Stirring Melt Casting Process. The surface states of SiC particles before or after being pretreated are measured and analyzed by SEM, EDS, XRD and TEM. It is pointed out that gas existing on the surface of SiC by physical and chemical absorption is the main cause that prevents SiC particles from dispersing and staying in the slurry in the process of addition SiC particles. The finer SiC powders, coarse fracture surface(cleavage stages) and Si 4+ ion existing on the SiC surface are gas absorption resouces. EDS results (electron beam acceleration voltage 6 kV is used) show that changes take place in C, Si and O concentrations of SiC particulate surface by the different pretreatment processes, and specially their concentrations by the optimal pretreatment process are C 76.22 (wt.)%, O 5.15 (wt.)% and Si18.63(wt.)%. A layer of dense amorphous SiO 2 formed by the oxidation is surrounded on SiC particles, and amorphous diffraction pattern of SiO 2 is obtained by selected area electron diffraction patterns. The crystal structure of SiC used is determined to be 6H, 33R and 5R types, in which 6H structure is dominant and SiC particles include little dissociated carbon by XRD. There does not exist amorphous SiO 2 diffraction characterization in XRD spectrum. It shows that SiO 2 content is very small.

对SiC粒子进行了多种预处理工艺试验 ,得出SiC粒子在 92 0℃高温焙烧氧化 ,再在HF酸 (1.5(vol.) % )与丙酮混合液、丙酮中清洗球磨工艺是较优的预处理工艺 .应用搅熔铸造工艺 ,处理后的SiC颗粒能较易分散到含镁的ZA - 2 7合金液中 .用SEM、EDS、XRD和TEM测定和分析了预处理前后SiC表面状态 ,得出SiC颗粒表面物理、化学吸附的气体是阻止其分散进入ZA - 2 7合金液的主要原因 ,SiC表面的微细粉末和Si4 + 离子是气体吸附源 ;确定了SiC表面SiO2 层的存在形式 ,并确定所使用SiC有三种结构类型 ,颗粒中含有游离碳 .

 
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