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Effects of Mo and Zr on Microstructure,Mechanical Properties and Wear Resistance of Fe-Al Based Alloys

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Journal of Materials science & Technology 2008年第3期24卷 309-312页

作者： I.D.Yeo h.s.kim Y.G.Yoo W.Y.kim Advanced Materials R&D Division Korea Institute of Industrial Technology7-47Songdo-dongYeonsu-gu

In this work the microstructure, mechanical properties and wear resistance of Fe-Al based alloys with various alloying elements were studied. The microstructures were examined by optical and scanning electron microscopy （sEM） equipped with an energy dispersive X-ray spectroscope （EDs）. Two types of alloys were prepared by vacuum arc melting. One is Fe-28Al based alloys （D03 structured） with and without alloying elements such as Mo and Zr. The other one is Fe-35Al based alloys （B2 structured） produced with the same manner. For both types of alloys, Mo addition had found to exhibit an equiaxed microstructure, while dendritic structure was observed to show the effect of Zr addition. These microstructural features were more evinced with increasing content of alloying element. Concerning the mechanical properties and wear resistance, Fe-35Al based alloys were superior to Fe-28Al based alloys over the whole temperature range investigated.

关键词： Fe-Al alloy Intermetallic Mechanical properties Wear resistance

hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

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Journal of Materials science & Technology 2023年第15期146卷 1-9页

作者： D.h.Chung J.Lee Q.F.he Y.K.kim K.R.Lim h.s.kim Y.Yang Y.s.Na Department of special Alloys Extreme Materials Research InstituteKorea Institute of Materials ScienceChangwonThe Republic of Korea Department of Mechanical Engineering City University of Hong KongKowloon TongKowloonHong KongChina Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohangThe Republic of Korea Center for heterogenic Metal Additive Manufacturing Pohang University of Science and TechnologyPohangThe Republic of Korea Department of Materials science and Engineering City University of Hong KongKowloon TongKowloonHong KongChina

heterostructured eutectic high-entropy alloys(EhEAs)have attracted significant attention owing to their novel properties,such as balanced combinations of strength and fracture ***,the toughening/strengthening mechanisms of these EhEAs have not been thoroughly *** this study,we developed a series of dual-phase Al_((18–2x))Co_(30)Cr_((11+x))Fe_((11+x))Ni_(3)0(x=-1,0,1)eutectic and neareutectic hEAs containing face-centered cubic(FCC)and body-centered cubic(BCC)*** the high amount of BCC,which is referred to as the brittle phase,newly developed EhEAs exhibited superior fracture ***,we discovered that a fully eutectic hEA exhibited further improvements in both yield stress and fracture toughness,outperforming our off-eutectic and other previously reported *** combining experiments and theoretical models,we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic hEA was derived from the high hetero-deformationinduced(hDI)strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.

关键词： Eutectic high entropy alloy Fracture toughness heterogeneous structure hetero deformation induced strengthening Misorientation angle

Microstructure,Elastic Modulus and Tensile Properties of Ti-Nb-O Alloy system

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Journal of Materials science & Technology 2008年第1期24卷 33-36页

作者： h.s.kim T.Y.Ra I.D.Yeo h.J.Bang Y.G.Yoo W.Y.kim Advanced Materials R＆D Division Korea Institute of Industrial Technology Incheon 406-800 Korea

In the present study Ti-Nb binary alloy system was chosen because it has excellent biocompatibility as well as reasonable mechanical properties,aiming at understanding oxygen content on microstructural formation, elastic modulus and tensile properties in Ti-Nb alloy *** alloy buttons of 50 mm in diameter were prepared by arc melting on a water-cooled copper hearth under an argon gas atmosphere with a non-consumable tungsten *** button ingots were then heat treated in a vacuum atmosphere at 1273 K for 0.5 h followed by water quenching in a specially designed heat treatment ***,elastic modulus and tensile properties were investigated in order to understand the effect of oxygen content in quenched Ti- Nb alloy *** orthorhombic structuredα″martensite was changed to bcc structuredβ-phase with increasing Nb ***,it was found that oxygen makesβ-phase stable in quenched Ti-Nb alloy *** modulus values were sensitive to phase stability of constituent *** strength increased with increasing oxygen *** will be explained by phase formation and stability behavior.

关键词： Ti-Nb-O alloy Phase stability Elastic modulus Mechanical properties

Fabrication of Al/Al_2Cu in situ nanocomposite via friction stir processing

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Transactions of Nonferrous Metals society of China 2017年第4期27卷 779-788页

作者： M.AZIZIEh D.IRANPARAsT M.A.G.DEZFULI Z.BALAK h.s.kim Department of Materials science and Engineering College of Engineering Ahvaz Branch Islamic Azad University Department of Materials science and Engineering Pohang University of Science and Technology (POSTECH)

The aim of present work is fabrication of Al/Al2Cu in situ nanocomposite by friction stir processing(FsP)as well asinvestigation of FPs parameters such as rotational speed,travel speed,number of FsP passes,and pin profile on the microstructure,chemical reaction,and microhardness of Al based *** Al2Cu particles were formed rapidly due to mechanicallyactivated effect of FsP as well as high heat generation due to Al?Cu exothermic *** microstructure of the nanocompositesconsisted of a finer grained aluminium matrix(~15μm),unreacted Cu nanoparticles(~40nm),and reinforcement nanoparticles *** morphology of Al2Cu is attributed to the local melting during *** diameter has a higher effect on themicrostructure and hardness *** hardness measurements exhibited enhancement by57%compared with the base metal.

关键词： friction stir processing composite materials hardness microstructure surface properties

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织物间相互摩擦引起的起球性能的表征

国外纺织技术（纺织针织服装化纤染整） 2002年第5期 36-39页

作者： h.s.kim 张辉

本文描述了一种圆筒型光源系统及其在织物起球性能客观评价中的应用.该圆筒型光源系统仅照亮了起球部位而排除背景干扰,因此很容易使起球部位与背景隔离开,并对起球进行测量.使用这个新的光源设计方案,对两种针织物的起球性能与纤维种... 详细信息

本文描述了一种圆筒型光源系统及其在织物起球性能客观评价中的应用.该圆筒型光源系统仅照亮了起球部位而排除背景干扰,因此很容易使起球部位与背景隔离开,并对起球进行测量.使用这个新的光源设计方案,对两种针织物的起球性能与纤维种类和摩擦周期间的函数关系作了成功的探讨.

关键词：织物相互摩擦起球性能表征

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使用固定化完整细胞系统连续生产谷氨酸

发酵科技通讯 1983年第3期 168-169+178页

作者： h.s.kim 曲立民

引言50多年来,谷氨酸单钠（MsG）已广泛用于调味,增味和化工试剂。随着对MsG 需求量的增加,估计现在年产量为3×10;吨。由于发酵法不断改进,产品得率在近几年中得到相当大的提高。现在大部分谷氨酸采用分批发酵法生产。作为改进工艺经... 详细信息

引言50多年来,谷氨酸单钠（MsG）已广泛用于调味,增味和化工试剂。随着对MsG 需求量的增加,估计现在年产量为3×10;吨。由于发酵法不断改进,产品得率在近几年中得到相当大的提高。现在大部分谷氨酸采用分批发酵法生产。作为改进工艺经济条件的可能途径,发展一种连续的工艺是很需要的。

关键词：固定化细胞完整细胞产量谷氨酸 α-氨基戊二酸神经递体游离细胞角叉菜分批发酵

复发性胶质母细胞瘤抗血管生成治疗早期疗效评价：MR酰胺质子转移成像和灌注加权成像与扩散加权MRI的比较

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国际医学放射学杂志 2020年第4期 485-486页

作者： J.E.Park h.s.kim s.Y.Park s.Chai Jung J.h.kim h.Y.heo 杨功鑫 Department of Radiology and Research Institute of Radiology University of Ulsan College of Medicine Asan Medical Center

MR酰胺质子转移成像(APT)可反映肿瘤生物学上活跃的部分,提供与扩散加权成像(DWI)或动态磁敏感对比成像(DsC)不同的信息,具有显示抗肿瘤效应的潜能。目

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基于深度学习重建的薄层垂体MRI在术后场景的诊断性能

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国际医学放射学杂志 2021年第2期44卷 229-230页

作者： M.kim h.s.kim h.J.kim J.E.Park s.Y.Park Y.h.kim 张子璇郭邦俊

摘要权衡图像噪声和空间分辨力对于实现高空间分辨力垂体MRI是一项挑战。基于深度学习的MRI重建实现了图像的降噪、边缘锐化和减少伪影,从而提高了薄层MRI的

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转移灶与卵巢癌标准化摄取比值对晚期浆液性卵巢上皮癌的预后价值

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国际医学放射学杂志 2018年第1期 109-110页

作者： h.h.Chung M.Lee h.s.kim J.W.kim N.h.Park Y.s.song 黄黎香 Department of Obstetrics and Gynaecology Cancer Research InstituteSeoul National University College of Medicine

摘要目的评价术前PET/CT经18F-FDG摄取测得的转移灶代谢活性对晚期浆液性卵巢上皮癌(EOC)病人的预后价值。方法评估国际妇产科协会(FIGO)标准的卵巢癌Ⅲ、Ⅳ

关键词：卵巢上皮癌转移灶卵巢癌浆液性预后价值