Materials Literature
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以Ti、B4C、Ni、Al粉末为原料，通过自蔓延高温反应合成工艺（SHS）制备TiC-TiB2-NiAl复合材料，研究NiAl含量对反应产物的物相组成及组织结构的影响。结果表明：Ti＋B4C＋Ni＋Al粉末SHS反应产物的物相组成为TiB2、TiC和NiAl，随着Ni＋Al添加量的增多，NiAl相的衍射峰强度逐渐增强；TiB2、TiC和NiAl在基体中呈现不同的形态，其中TiB2呈六边形或长条状，TiC呈圆形，NiAl填充在TiC和TiB2颗粒之间；随着NiAl含量的增加，TiC-TiB2-NiAl 复合材料的晶粒逐渐被细化，致密度和抗压强度均被提高，TiC 的形态由不规则形状转变为圆形。复合材料的断裂方式由单纯的沿晶断裂转变为混…
U petrokemijskoj industriji svakodnevno su prisutni sve veći zahtjevi na operativna i eksploatacijska svojstva ugrađenih materijala. Potencijalni materijal za primjenu u ovoj grani industrije je i mikrolegirani čelik API 5L X80 dobiven termo-mehanički kontroliranim postupkom valjanja. Pri zavarivanju spomenutog čelika…
The grain boundary (GB) engineering for improvement of fatigue property in SUS316L austenitic stainless steel was investigated. The fatigue crack was predominantly nucleated at high energy random GBs. The low-Σ coincidence site lattice (CSL) GBs with the lower GB energy showed the higher resistance to fatigue crack nu…
Tightening strength of bolted joints cannot be determined by only tensile test of the bolt because a bolt receives not only tensile force but also torque during tightening process. We would like to introduce the tightening characteristics and fatigue characteristics of nonferrous bolts that we had investigated so far.…
Compressive creep behavior and dislocation substructures in hot-rolled (40%) Mg-Y based alloys have been investigated in this study. Creep strength of magnesium is significantly improved by the simultaneous addition of yttrium and zinc. Apparent activation energy for creep in Mg-Y and Mg-Y-Zn solid solution alloys are…
We demonstrate THz-induced transparency in two types of single-layer CVD graphene samples utilizing high-field THz pulses. The nonlinear THz transmission depends on the local conductivity of the samples and dynamically varies in the time domain.
近年、フラーレンやコロネンなどの有機分子を内包した有機分子内包CNTはその光学的特性から、次世代光デバイスへの応用が期待されている。本研究では、分子動力学計算を用いて、コロネン雰囲気中にCNTを配置して、コロネン内包CNTが形成される過程を観察し、その安定構造を調べた。内包されたコロネンの傾斜角度はCNTの径に依存することが分かった。
vitro construction ofthree dimensional tissue with circulation system
Bone is a kind of composite material with the smart microscopic structure mainly composed of collagen fibers and hydroxyapatite crystals. Recently, bioabsorbable composite materials, such as collagen/hydroxyapatite composite materials and hydroxyapatite/poly-L-lactic acid composite materials, had been investigated and…
The aim of this study is to construct a simplified numerical method that can predict an actual texture development during hot rolling in AZ61 Mg. First, stress-strain and Lankford value-strain relations were experimentally investigated in a hot rolling temperature range (350℃) for AZ61Mg alloy sheets. Next, based on t…
The objective of the present investigation was to characterize the thermo-physical and mechanical properties of AlSiC MMC suitable for heat pipes. In this paper an overview of AlSiC (p) metal matrix composite is presented through: production techniques, effects of reinforcements, mechanical, thermo-physical properties…
In this study, the tensile properties of the quasi-static and the impact tests for 7075 aluminum alloys subjected to pre-fatigue deformation in a humid environment were investigated. An impact tensile test was performed by means of the Split Hopkinson pressure bar method. The flow stress in both the quasi-static and t…
以甲醇为溶剂，将异马来二氰基二硫烯酸钾[K2（i-mnt）]和六水氯化镍分别与溴化4一溴苄基喹啉盐（E4一BrBzQI]Br）或溴化4一硝基苄基喹啉盐（[4-NO：BzQl]Br）直接反应，得到两种新的离子对配合物E4一BrBzQl]2[[Ni（i—mnt）2]（1）和[4-N02BzQl]2ENi（i—mnt）2]（2）；测定了其红外光谱和紫外一可见光谱，并利用X射线衍射表征了配合物1的晶体结构．结果表明，配合物[4一BrBzQl]2ENi（i-mnt）2]为三斜晶系，P一1空间群，其每个不对称单元含半个ENi（i—mnt）2]2-阴离子和1个E4一BrBzQl]’阳离子，晶体中的阴、阳离子通过静电作用和C—H…s、c—H…N氨…
According to the United States Environmental Protection Agency, the size of particles is directly associated with their ability to damage the human health. Hence, human exposure to nanoparticles is becoming increasingly a concern. Air filtration can be an effective way to reduce markedly the amount of nanoparticles in…
Since the engine combustion is affected by various engine parameters as well as fuel characteristics, it is very difficult to find out the clear effect of fuel property on it. In order to clarify the change of emission characteristic caused by fuel trend, we propose a fundamental flame research method using a small po…
For better selection of coated cutting tools, TiAlN (Ti50Al50N) and CrAlN (Cr50Al50N) coatings were deposited onto ball-nose and square end mills using arc evaporation, and their cutting performances were evaluated using steel workpieces of various hardnesses. In particular, cutting tests were performed on three types…
In order to investigate suppression of fatigue crack growth in hydrogen-charged chrome molybdenum steel SCM 435 by cavitation peening employing a cavitating jet in water, a load controlled plate bending fatigue tests were conducted with load stress of 400 MPa after cathodic hydrogen charging with and without cavitatio…
Notched off-axis fatigue behavior of CFRP laminate has been studied. Static and fatigue tests are performed at room temperature on unnotched (UN) and center-hole (CH) coupon specimens of a plain woven CFRP laminate for different fiber orientations as well as for different stress ratios. The static and fatigue strength…
The processes occurring in biphase powders of Fe Co Ni at heating in vacuum are studied in the paper. Samples are synthesized by hydrazinehydrate reduction of metal salts in aqua solutions at highly alkaline medium. When drawing phase diagrams of the nanostructured systems some questions related to the deviation of th…
An observation of sliding surfaces and a measurement of the amount of wear are generally performed in order to evaluate tribological characteristics. However, we don't know how friction and wear phenomena change between sliding surfaces during experiments. In this study, the visualization and evaluation of tribologica…