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Deformation mechanism at impact test of Al-11% Si alloy processed by equal-channel angular pressing with rotary die

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中国有色金属学会会刊：英文版 2007年第1期17卷 104-109页

作者：马爱斌 Y. NISHIDA 江静华 N. SAITO I. SHIGEMATSU A. WATAZU Department of Materials Science and Engineering Hohai University National Institute of Advanced Industrial Science and Technology ShimoshidamiMoriyama-ku

Al-11%Si(mass fraction)alloy was transformed into a ductile material by equal-channel angular pressing(ECAP)with a rotary *** mechanisms at impact test,slip deformation by dislocation motion and grain boundary sliding,were *** ultrafine grains with modified grain boundaries and the high content of fine particles(<1μm)were necessary for attaining high absorbed *** results contradict the condition of slip deformation by dislocation motion and coincide with that of grain boundary *** fine zigzag lines like a mosaic were observed on the side surface of the tested *** observed lines may show grain boundaries appeared by the sliding of grains.

关键词：铝合金变形行为微观结构晶界滑动

Influence of Dietary Fiber on the Bioavailability of Zinc in Rats

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Biomedical and Environmental Sciences 1996年第2期9卷 204-208页

作者： HIROMICHIKONDO AZUMIOSADA DepartmentofHomeEconomics KinjoGakuinUniversity463OmoriMoriyamaNagoyaJapan DepartmentofHomeEconom

Young male albino rats were fed ad libitum semipurined diet supplemented with or without 5% of purified dietary fiber (cellulose, agar-agar, pectin, chitin or chitosan) for 31 days. Each test diet was carefully prepared in order to contain zinc at the level of 8 ppm from zinc *** rats fed diets containing 5% of dietary fiber except chitosan, fbod consumption was higher than the control. The body weight gain of rats fed diets containing cellulose, pectin or chitin was higher than the control. However, food intake and body weight gain of rats fed the diet containing 5% of chitosan were definitely lower than not only the other fiber including diet groups but also the control *** dietary fiber was added at 5% level to diet, zinc absorption was not changed to a considerable degree. But, the apparent zinc absorption of rats fed the agar-agar diet was 70%. On the other hand, zinc absorption in the pectin diet group was about 10% higher than the *** total amount of zinc in tibia or femur of rats fed non-fiber diets was a little higher than that of rats fed fiber diets

关键词：膳食纤维大鼠锌生物有效性

Nanotwin-assisted nitridation of quenched FeNi alloy nanopowders for rare-earth-free magnets

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Journal of Materials Science & Technology 2023年第34期165卷 244-252页

作者： Jian Wang Yusuke Hirayama Kazuyuki Suzuki Kwangjae Park Zheng Liu Kenta Takagi Kimihiro Ozaki Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology4-205SakurazakaMoriyamaNagoya463-8560Japan

L1_(0)-ordered FeNi alloy with a high uniaxial magnetic anisotropy and large magnetic moment is a promising candidate for rare-earth-free permanent magnets ***,the synthesis of this chemically ordered phase remains a longstanding challenge because of its low chemical order-disorder transition temperature(200-320℃).Although a non-equilibrium synthetic route based on a nitrogen topotactic reaction has been proposed as a valid approach,the volume fraction and degree of chemical ordering of the product phase are ***,we propose a promising approach that promotes the efficient formation of L1_(0)-ordered nitride phase in FeNi nanopowders by introducing a quenching treatment during a low-oxygen induction thermal plasma *** quenched FeNi nanopowders possessed much smaller powder sizes(40.4 vs 74.0 nm),exhibited higher number densities of nanotwins(39.8%vs 24.1%)and formed much larger volume fraction(33.6 wt.%vs 0.6 wt.%)of ordered phase than the unquenched ***,quenching-induced high-density nanotwins led to the dominant coverage of serrated{001}crystal facets over the surfaces of the FeNi *** unique features substantially accelerated the formation of the L1_(0)-ordered nitride phase in the FeNi nanopowders because the{001}crystallographic orientation had the highest nitrogen *** work provides not only a valid synthetic approach for mass production of the L10-ordered nitride phase in FeNi nanopowders but also novel insights into the crystal-defect-assisted nitridation of nanomaterials.

关键词： Rare-earth-free Permanent magnet FeNi Nitridation Nanotwin

Surgical treatment of gallbladder cancer:An eight-year experience in a single center

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World Journal of Hepatology 2020年第9期12卷 641-660页

作者： Yasuyuki Kamada Tomohide Hori Hidekazu Yamamoto Hideki Harada Michihiro Yamamoto MasahiroYamada Takefumi Yazawa Masaki Tani Asahi Sato Ryotaro Tani Ryuhei Aoyama Yudai Sasaki MasazumiZaima Department of Surgery Shiga General HospitalMoriyama 524-8524ShigaJapan

BACKGROUND Gallbladder cancer(GBC)is the most common biliary malignancy and has the worst prognosis,but aggressive surgeries[e.g.,resection of the extrahepatic bile duct(EHBD),major hepatectomy and lymph node(LN)dissection]may improve long-term *** may be suspected preoperatively,identified intraoperatively,or discovered incidentally on *** To present our data together with a discussion of the therapeutic strategies for *** We retrospectively investigated nineteen GBC patients who underwent surgical *** Nearly all symptomatic patients had poor outcomes,while suspicious or incidental GBCs at early stages showed excellent outcomes without the need for two-stage *** nodes around the cystic duct were reliable sentinel nodes in suspicious/incidental *** LN dissection and EHBD resection prevented metastases or recurrence in early-stage GBCs but not in advanced GBCs with metastatic LNs or invasion of the nerve *** patients with positive surgical margins(e.g.,the biliary cut surface)showed poor *** were performed in sixteen patients,nearly all of which were minor *** were observed in the left-sided liver but not in the caudate *** may need to reconsider the indications for major hepatectomy,minimizing its use except when it is required to accomplish negative bile duct *** a few patients received neoadjuvant or adjuvant *** were significant differences in overall and disease-free survival between patients with stages≤IIB and≥IIIA *** median overall survival and disease-free survival were 1.66 and 0.79 years,*** Outcomes for GBC patients remain unacceptable,and improved therapeutic strategies,including neoadjuvant chemotherapy,optimal surgery and adjuvant chemotherapy,should be considered for patients with advanced GBCs.

关键词： Gallbladder cancer Surgery Prognosis Outcome Metastasis Lymph node Extrahepatic bile duct

Novel synthesis of single-crystalline TbCu_(7)-type Sm-Fe powder by low-temperature reduction-diffusion process using molten salt

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Journal of Rare Earths 2022年第7期40卷 1126-1133页

作者： Shusuke Okada Kenta Takagi Magnetic Powder Metallurgy Research Center National Institute of Advanced Industrial Science and Technology(AIST)2266-98 AnagahoraShimoshidami MoriyamaNagoya463-8560Japan

In this study,molten salt was used as a solvent for calcium(Ca)to let a reduction-diffusion(R-D)reaction occur below the melting point of Ca(1115 K),which is the lower limit temperature of the co nventional RD *** the R-D reaction is conducted below 923 K with LiCl molten salt,submicron-sized TbCu_(7)-type Sm-Fe powder is *** c/a ratio of the powder estimated by a synchrotron X-ray diffraction pattern is 0.8456,which is consistent with the Sm_(0.67)Fe_(5.667)(SmFe_(8.5))*** electron backscatter diffraction analysis reveals that single-crystalline TbCu_(7)-type SmFe_(8.5) powder was synthesized for the first time.

关键词： Reduction-diffusion TbCu_(7) Molten salt Permanent magnet Rare earths

Effect of microstructures on superplasticity of Al-11%Si alloy

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中国有色金属学会会刊：英文版 2007年第3期17卷 509-513页

作者：江静华马爱斌 N. SAITO A. WATAZU 林萍华 Y. NISHIDA Department of Materials Science and Engineering Hohai University National Institute of Advanced Industrial Science and Technology 2266-98 Anagahora Shimoshidami Moriyama-ku Nago ya 463-8560 Japan

Three kinds of Al-11%Si (mass fraction) alloy samples with different processes were produced to investigate the effect of microstructures on its superplasticity. Among them, the as-ECAP sample pressed 16 passes has ultrafine grains (300 nm) and the finest secondary particles. The ECAP-T6 sample, with ECAP 16 passes followed by T6 treatment, has fine secondary particles (3 μm) but the largest grains (8 μm). Contrarily, the T6-ECAP sample, with T6 treatment followed by ECAP 16 passes, has ultrafine grains and the large secondary particles (7 μm). The tensile testing results show that the as-ECAP sample exhibits superplasticity at high strain rate of 5.75×10-1 s-1 due to its fine secondary particles and ultrafine grains. The ECAP-T6 sample, however, does not exhibit superplasticity at the same high strain rate of 5.75×10-1 s-1 because it has relatively large secondary particles and large grains. Remarkably, the T6-ECAP sample does not have superplasticity even at the lower strain rate of 1.15×10-1 s-1, attributing to its comparatively large secondary particles. When most secondary particles are larger than 7 μm, the high strain rate superplasticity could not be obtained even if this sample has ultrafine grains.

关键词：硅铝合金微结构粒子超塑性能

Corrosion behavior of hypereutectic Al-23%Si alloy (AC9A) processed by severe plastic deformation

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Transactions of Nonferrous Metals Society of China 2010年第2期20卷 195-200页

作者：江静华马爱斌宋丹 N. SAITO 袁玉春 Y. NISHIDA College of Materials Science and Engineering Hohai University Nanjing 210098 China National Institute of Advanced Industrial Science and Technology 2266-98 Anagahora Shimoshidami Moriyama-ku Nagoya 463-8560 Japan

Ultrafine-grained(UFG) hypereutectic Al-23%Si (mass fraction) alloy was achieved through equal-channel angular pressing(EACP) procedure. And the electrochemical properties after various ECAP passes were investigated in neutral NaCl solution. Potentiostatic polarization curves show that the corrosion potential of the ECAPed sample after 4 passes decreases markedly, while the corrosion current density reaches 1.37 times that of the as-cast alloy. However, the φcorr and Jcorr values after 16 passes are improved and approach those of the as-cast alloy. Immersion tests also show that the mass-loss ratio of ECAPed alloy decreases with increasing the pressing pass, which is lowered to 28.7% with the increase of pass number from 4 to 16. Pitting susceptibility of the ECAPed alloy after initial 4 passes is boosted, due to the presence of biggish voids resulted from the breakage of brittle large primary silicon crystals during ECAP. Increasing ECAP pass makes the voids evanesce and results in the homogeneous ultrafine-grained structure, contributing to a higher pitting resistance. These results indicate that enough ECAP passes are beneficial to increasing corrosion resistance of the hypereutectic Al-23%Si alloy.

关键词： aluminum casting alloys ECAP corrosion behavior ultrafine grained microstructure

Technical aspects in pancreaticoduodenectomy and therapeutic strategies for pancreatic cancer:History,current status,and future perspectives

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Hepatobiliary & Pancreatic Diseases International 2022年第6期21卷 600-602页

作者： Tomohide Hori Daiki Yasukawa Department of Surgery Shiga General HospitalMoriyama 524-8524Japan Department of Surgery Shiga University of Medical ScienceOtsu 520-2192Japan

The incidence of pancreatic cancer(PC)has increased,and in-vasive ductal adenocarcinoma is the most common among PC pa-tients[1].Even in patients who receive radical treatments,namely chemotherapy and surgery,the five-year survival is only 2%-9%[1].Currently,many physicians recognize that further developments in multidisciplinary therapy are crucial to overcome PC[1].

关键词： cancer chemotherapy surgery

A novel mouse model of hepatocarcinogenesis triggered by AID causing deleterious p53 mutations

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A novel mouse model of hepatocarcinogenesis triggered by AID...