检索结果-南通市图书馆

用原子力显微镜纳米压痕法研究Gr/Al复合材料热循环后的微观力学性能(英文)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

稀有金属材料与工程 2001年第4期30卷 261-263页

作者：刘澄张国定 naka masaaki 上海交通大学金属基复合材料国家重点实验室上海200030 日本大阪大学接合科学研究所

采用原子力显微镜纳米压痕法测量了 Gr/ Al复合材料热循环后界面附近的纳米硬度和塑性变形能力的分布。随热循环次数的增加 ,纤维和基体中的纳米硬度减小 ,而基体的塑性变形能力增加。纳米硬度和塑性变形能力的大小是随距纤维 /基体界... 详细信息

采用原子力显微镜纳米压痕法测量了 Gr/ Al复合材料热循环后界面附近的纳米硬度和塑性变形能力的分布。随热循环次数的增加 ,纤维和基体中的纳米硬度减小 ,而基体的塑性变形能力增加。纳米硬度和塑性变形能力的大小是随距纤维 /基体界面的距离的变化而变化的。纳米硬度的变化可提供有关残余应变方面的信息 ,这是因为材料内部局部区域的弹性或塑性残余应变会影响此处的硬度大小。

关键词：纳米硬度塑性变形能力残余应力界面金属基复合材料

Brazeability of Ni-Sn and Ni-Si Bases Filler Metals against Si3N4

在线全文

学校读者我要写书评

暂无评论

Brazeability of Ni-Sn and Ni-Si Bases Filler Metals against ...

SiC_f/Al模型复合材料界面微区残余应力

The Fourth International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS’2004)

作者： Hideki Takase masaaki naka J.C.Schuster Graduate School of Engineering Osaka University Joining and Welding Research Institute Osaka University Department of Physical Chemistry University of Vinena Graduate School of Engineering Osaka University Joining and Welding Research Institute Osaka University Department of Physical Chemistry University of Vinena Graduate School of Engineering Osaka University Joining and Welding Research Institute Osaka University Department of Physical Chemistry University of Vinena

A series of Ni-20Sn-xTi alloys ( x changed from 0 to 15 at%) and Ni-20Si-yTi (y changed from 0 to 15 at% ) has been developed for brazing Si3N4 in vacuum. The wettability and bonding strength of the alloys were evaluated by sessile drop and shear testing methods. The contact angle of both alloys on Si3N4 shows the lowest at 10 at% Ti in the alloys, and the tendency of strength of Si3N4 to Si3N4 brazed joints with Ti content in the alloys is coincident with tendency of the contact angle of the alloys. The Ni-20Sn-10Ti alloy or Ni-20Si-10Ti alloy, which processes the lowest contact angle, yields the highest bonding strength against Si3N4 In other words, the alloy which possesses the high wettability against the ceramics, shows the good bonding strength against the ceramics.

关键词： Ni filler metals Wettability Brazing Bonding Ceramic joining

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

上海交通大学学报 2001年第3期35卷 368-370页

作者：刘澂覃继宁张国定奈贺正明上海交通大学金属基复合材料国家重点实验室上海200030 日本大阪大学接合科学研究所

实验测定界面附近残余应力的分布有利于深入研究金属基复合材料变形和断裂行为的微观机制 ,对制备综合性能良好的复合材料具有指导作用 .采用束斑直径为 30 μm的微小 X射线束 ,测定了单根 Si C连续纤维及连续 Si C纤维束增强纯 Al模型... 详细信息

实验测定界面附近残余应力的分布有利于深入研究金属基复合材料变形和断裂行为的微观机制 ,对制备综合性能良好的复合材料具有指导作用 .采用束斑直径为 30 μm的微小 X射线束 ,测定了单根 Si C连续纤维及连续 Si C纤维束增强纯 Al模型复合材料中 Si C纤维附近基体中的周向和径向残余应力分布 ,并将测量结果与有限元模拟结果进行了比较 .

关键词：金属基复合材料残余应力界面碳化硅铝变形断裂微观机制

纳米硬度法研究颗粒形状对SiCp/LD2复合材料塑性的影响

在线全文

学校读者我要写书评

暂无评论

纳米硬度法研究颗粒形状对SiCp/LD2复合材料塑性的影响

Grain size effect on cyclic oxidation of(TiB_2+TiC)/Ni_3Al composites

2000年中国材料研讨会

作者：刘澂张国定 masaaki naka 上海交通大学材料学院金属基复合材料国家重点实验室日本大阪大学接合科学研究所

本文采用纳米硬度法研究了钝化处理的SiC颗粒增强LD2基复合材料和未钝化处理的具有尖角的SiC颗粒增强LD2基复合材料中颗粒附近的微观力学性能的分布对SiC/LD2复合材料的塑性的影响。研究结果表明:两种类型颗粒的周围都存在纳米硬度和塑... 详细信息

本文采用纳米硬度法研究了钝化处理的SiC颗粒增强LD2基复合材料和未钝化处理的具有尖角的SiC颗粒增强LD2基复合材料中颗粒附近的微观力学性能的分布对SiC/LD2复合材料的塑性的影响。研究结果表明:两种类型颗粒的周围都存在纳米硬度和塑性变形能力分布不均匀的区域,且硬度与塑性变形能力的分布趋势相反。在尖角颗粒附近纳米硬度要高于钝化颗粒附近的纳米硬度,而塑性变形能力则低于钝化颗粒附近的塑性变形能力,因此未钝化处理的SiC颗粒增强LD2基复合材料具有较低的塑性。

关键词：纳米硬度塑性变形能力颗粒形状

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2012年第7期22卷 1588-1593页

作者：曹国剑许虹宇郑镇洙耿林奈贺正明哈尔滨理工大学材料科学与工程学院哈尔滨150040 哈尔滨工业大学材料科学与工程学院哈尔滨150001 大阪大学接合研究所日本大阪567-0047

（TiB2＋TiC）/Ni3Al composites were prepared by mechanical alloying of elemental powders and subsequently spark plasma *** of（TiB2＋TiC）/Ni3Al composite sintered at 950°C was finer than that of composite sintered at 1050°*** influence of grain size on cyclic oxidation behavior was *** oxidation results showed that the composite sintered at 950°C had smaller mass gains than the composite sintered at 1050°*** and EDS results indicate that finer grain size is beneficial for increasing the oxidation resistance by improving the formation of a continuous TiO2 outer layer and a continuous Al2O3 inner layer on the surface of the composites sintered at 950°C.

关键词： nickel aluminides composites grain refinement oxidation mechanical alloying

Evaluation of the Properties of Si3N4/Si3N4 Joint Brazed Using a Filler Alloy Containing Pd

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2003年第z1期19卷 187-188页

作者： M. naka Jie ZHANG Yu ZHOU Joining and Welding Research Institute Osaka University Ibaraki Osaka 567-0047 Japan School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Si3N4 ceramic was jointed to itself using a filler alloy of Cu76.5Pd8.5Ti15, and the mechanical properties of the jointwere measured and analyzed. By using a filler alloy of Cu76.5Pd8.5Ti15, the SisN4/SisN4 joints were obtained bybrazing at 1373～1473 K for 0.9～5.4 ks under a pressure of 2×10-3 MPa. The effect of brazing parameters on theshear strength of the joint was investigated. When the brazing temperature and holding time is 1423 K and 5.4 ksrespectively, the maximum shear strength of the Si3N4/Si3N4 joint is obtained to be 198 MPa.

关键词： Si3N4 ceramic, Active brazing, Ci-Pd-Ti filler alloy, Shear strength

Particle shape effects on ductility of SiC particle reinforced LD2 matrix composites investigated by AFM-based nanoindentation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2001年第4期11卷 509-512页

作者：刘澄张国定 M.naka State Key Laboratory of Metal Matrix Composites Shanghai Jiaotong University Joining and Welding Research Institute of Osaka University Osaka 567-0047 Japan

An AFM (Atomic Force Microscope) based nanoindentation method for local measurement of mechanical properties near interfaces in both angular and blunted SiC particle reinforced LD2 composites is presented. The blunted composite exhibits an improved ductility than the angular counterpart. The nanoindentation examination shows that the micromechanical properties near interfaces distribute unevenly and vary with particle shape in the SiC p/LD2 composites. There are a higher nanohardness value and a lower plastic deformation capacity around an angular particle than around a blunted one. It is inferred that the residual stress and strain concentrations are severer around the angular particle, which causes matrix cracking at a lower external strain level and leads to a lower ductility of the angular composite.

关键词： micromechanical properties nanoindentation interface ductility

Interfacial reaction and growth behavior of reaction layer of Si_3N_4/Si_3N_4 joint brazed by Cu-Zn-Ti filler alloy

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2005年第S2期15卷 261-265页

作者：张杰周玉 M.naka School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Joining and Welding Research Institute Osaka University Ibaraki Osaka 567-0047 Japan

Si3N4 ceramic was jointed to itself using a filler alloy of Cu-Zn-Ti by the reaction between Ti and Si3N4. The microstructure of the interface in the joint is found to be Si3N4 ceramic/TiN reaction layer/Ti5Si3 reaction layer. The grain size of the TiN and Ti5Si3 reaction layer is 0.1μm and 1-2μm, respectively. There is no crystal orientation relationship between TiN reaction layer and Si3N4 ceramic or Ti5Si3 reaction layer. The kinetic equation for calculating the thickness of the reaction layer was obtained. When a （CuZn）85Ti15 alloy is used as the filler alloy, the apparent activation energy of the growth of the reaction layer is 201.69kJ/mol.

关键词： Si3N4 ceramic Cu-Zn-Ti filler alloy interfacial reaction kinetic

Association of non-synonymous variants in WIPF3 and LIPA genes with ab- dominal aortic aneurysm： an autopsy study

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2016年第12期13卷 960-967页

作者： Yuko Maeda Noriko Sato Makiko naka-Mieno Seijiro Mori Tomio Arai Masashi Tanaka masaaki Muramatsu Motoji Sawabe Department of Molecular Epidemiology Medical Research Institute Tokyo Medical and Dental University Tokyo Japan Department of Medical Informatics Center of Inormation Jichi Medical University Tochigi Japan Center for Promotion of Clinical Investigation Tokyo Metropolitan Geriatric Hospital Tokyo Japan Department of Pathology Tokyo Metropolitan Geriatric Hospital Tokyo Japan Research Teams for Geriatric Pathology Tokyo Metropolitan Institute of Gerontology Tokyo Japan Department of Genomics for Longevity and Health Tokyo Metropolitan Institute of Gerontology Tokyo Japan Department of Molecular Pathology Graduate School of Health Care Sciences Tokyo Medical and Dental University Tokyo Japan

Background Abdominal aortic aneurysm （AAA） is a multifactorial disease with strong genetic components. Various genetic loci have been associated with clinical AAA, but few studies have investigated pathological AAA, an intermediate phenotype of the disease. Methods We examined 2263 consecutive autopsies of older Japanese subjects from a study on geriatric diseases in Japanese individuals （The JG-SNP study）. The presence of AAA was determined with a pathological diagnosis during autopsy. Single nucleotide variants （SNVs） associated with AAA were determined with an Illumina HumanExome Beadchip array. Logistic regression analyses were performed to determine ge- netic associations. Age, gender, and other risk factors of AAA were analyzed as covariates. Results 118 subjects with AAA and 2145 sub- jects without AAA were analyzed in a case-control setting. No variants reached significance after applying the Bonferroni correction （P 〈 2.05×10^-6）. The strongest associations were found with rs3750092 （p.E321G, OR： 0.36, 95% CI： 0.24-0.56, P = 6.09 ×10^-6）, a variant in the WAS/WASL interacting protein family 3 （WIPF3）, and with rs1051338 （p.T16P, OR： 2.50, 95% CI： 1.70-3.66, P = 2.79 ×10^-6） and rs2246942 （intronic, OR： 2.32, 95% CI： 1.58-3.41, P = 1.61 ×10^-5）, variants in the lysosomal acid lipase A （LIPA）. LIPA is essential for macrophage cholesterol metabolism. Immunohistological analyses of WIPF3 protein in AAA samples from three subjects revealed that WIPF3 was expressed in macrophages ofatheromatous plaques. Conclusions This study suggests that WIPF3 and LIPA, both of which are expressed in the macrophages are involved in pathological AAA. These results should be regarded as hypothesis-generating; thus, replication study is warranted.

关键词： Abdominal aortic aneurysm Lysosomal acid lipase A WAS/WASL interactingproteinfamily 3