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Sc对Al/Fe层状复合材料界面化合物生长行为的影响

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金属热处理 2024年第1期49卷 84-90页

作者：王振高坤元张小军聂祚仁黄晖吴晓蓝北京工业大学材料与制造学部北京100124

采用SEM、EDS等手段研究了铝侧添加Sc元素对Al/Fe复合界面金属间化合物的生长、种类及组织形貌的影响。结果表明,冷轧复合的Al/Fe复合板在475~640℃退火1 h后均产生了连续的界面化合物,在560℃及以下时,金属间化合物厚度变化趋势基本一... 详细信息

采用SEM、EDS等手段研究了铝侧添加Sc元素对Al/Fe复合界面金属间化合物的生长、种类及组织形貌的影响。结果表明,冷轧复合的Al/Fe复合板在475~640℃退火1 h后均产生了连续的界面化合物,在560℃及以下时,金属间化合物厚度变化趋势基本一致,在560℃以上时,含Sc的复合板界面金属间化合物增长趋势明显变缓,厚度大幅降低,这表明Al侧添加Sc元素不能完全抑制界面金属间化合物的产生。同时,Sc元素的添加并未改变界面化合物的种类及分布,界面化合物从Al侧到Fe侧依次为FeAl_(3)、Fe_(2)Al_(5)、FeAl。在475℃时,Fe侧Fe_(2)Al_(5)相呈细小的锯齿状形貌,但整体十分平整,在580℃时,Fe侧Fe_(2)Al_(5)相呈粗大“指状”形貌,起伏较大。

关键词：铝/铁复合微合金化金属间化合物

Er、Zr及热处理对高锌铝合金组织和力学性能的影响

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稀有金属材料与工程 2024年第1期53卷 250-256页

作者：王潇博荣莉黄晖魏午高倩王泽忠周力王猛聂祚仁北京工业大学材料与制造学部北京100124 东风汽车集团股份有限公司湖北武汉430056 西安航天动力机械有限公司陕西西安710025

以Al-30Zn-3Cu-2.5Si高锌铝基合金为研究对象,探究稀土元素Er、Zr对铸态及热处理态合金组织和力学性能的影响,并分析和探讨了其作用机理。结果表明,当添加0.10%(质量分数,下同)Er和0.10%Zr元素后能够明显地细化合金晶粒,平均晶粒尺寸由7... 详细信息

以Al-30Zn-3Cu-2.5Si高锌铝基合金为研究对象,探究稀土元素Er、Zr对铸态及热处理态合金组织和力学性能的影响,并分析和探讨了其作用机理。结果表明,当添加0.10%(质量分数,下同)Er和0.10%Zr元素后能够明显地细化合金晶粒,平均晶粒尺寸由74.28μm减小至60.01μm,且α-Al晶粒转变为细小的等轴晶。稀土元素Er、Zr的添加会在合金内部形成Al3(Er,Zr)细小的粒子并能够起到钉扎位错的作用,从而提高合金的力学性能。添加Er、Zr后,铸态合金的抗拉强度由未添加稀土元素的323.01 MPa提高到了358.29 MPa,提升了10.93%;屈服强度由309.33 MPa提高到了315.00MPa,提升了1.83%;延伸率基本未发生变化。合金经固溶时效热处理强化后,添加稀土元素合金的抗拉强度为449.48 MPa,屈服强度为408.51 MPa,比铸态合金分别提高了25.45%、29.68%。粗大的第二相存在于晶界处,导致合金的延伸率仍较差。

关键词：高锌铝合金稀土元素热处理组织力学性能

Microstructure and Phase Transformation of a Niobium-rich TiAl-based Alloy Containing Boron and Carbon

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Journal of Materials Science & Technology 2012年第5期28卷 453-460页

作者： Ziyong Chen Xianglin Su Zhilei Xiang zuoren nie College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124China

Microstructure and phase transformation of Ti46Al8Nb0.5B0.2C alloy have been investigated.X-ray diffraction （XRD）,optical microscopy （OM）,scanning electron microscopy （SEM） and transmission electron microscopy （TEM） results show that as-cast and hot isostatic pressing （HIP） alloy mainly composed of γ and α 2 phase have fully lamellar microstructure with point-like or ribbon-like TiB 2 distributing in lamellar colony or at grain *** mean size of lamellar colony is about 150 and 450 μm for as-cast and HIP alloy,*** lamellar spacing is about 550 and 600 nm for as-cast and HIP alloy,*** has been found that cooling rates and quenching temperatures have significant effect on phase transformation of Ti46Al8Nb0.5B0.2C *** the alloy is treated at 1380℃ for 1 h and cooled from α domain,water cooling leads to complete α → α 2 transformation,oil cooling leads to predominant α → α 2 and part α → γ m transformation,air cooling leads to α → α ＋ γ p2 →L（α ＋ γ） →L（α 2 ＋ γ） transformation,and furnace cooling leads to α → α ＋ γ p3 →L（α ＋ γ） →L（α 2 ＋ γ） ***,when the alloy is treated at 1400℃ for 1 h and cooled from α domain,water cooling leads to predominant α → α 2 and part α → α ＋ γ p4 → γ m transformation,oil cooling leads to α → α ＋ γ p5 → γ m transformation,air cooling leads to α → α ＋ γ p6 →L（α ＋ γ） →L（α 2 ＋ γ） transformation,and furnace cooling leads to α → α ＋ γ p7 →L（α ＋ γ） →L（α 2 ＋ γ） *** evolution of the alloy during various heat treatments has been examined and the phase transformation mechanisms have been *** on the experimental observation,schematic CCT diagrams for the alloy have been given.

关键词： TiAl-based alloys Heat treatment Microstructure Phase transformation

EFFECTS OF Y₂O₃ AND CeO₂ ON PROCESSING AND CHARACTERISTICS OF TUNGSTEN ELECTRODES

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中国有色金属学会会刊：英文版 1999年第2期9卷 118-122页

作者： Chen, Ying nie, zuoren Zhou, Meiling Zhang, Jiuxing Zuo, Tieyong Beijing Polytechnic Univ Beijing China

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｙｅａｒｓ，ｔｕｎｇｓｔｅｎｅｌｅｃｔｒｏｄｅｍａｔｅｒｉａｌｓｃｏｎｔａｉｎｉｎｇｏｎｅｋｉｎｄｏｆｒａｒｅｅａｒｔｈｍｅｔａｌｏｘｉｄｅａｓＬａ２Ｏ３，ＣｅＯ２ａｎｄＹ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｙｅａｒｓ，ｔｕｎｇｓｔｅｎｅｌｅｃｔｒｏｄｅｍａｔｅｒｉａｌｓｃｏｎｔａｉｎｉｎｇｏｎｅｋｉｎｄｏｆｒａｒｅｅａｒｔｈｍｅｔａｌｏｘｉｄｅａｓＬａ２Ｏ３，ＣｅＯ２ａｎｄＹ２Ｏ３，ｈａｖｅｂｅｅｎｄｅｖｅｌ...

关键词： Y2O3CeO2tungsten electrodearcstartingconsumption

Ab initio Calculations of Magnetic Properties of Fe(16)N2

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Journal of Materials Science & Technology 2006年第6期22卷 833-838页

作者： Dan LI Yousong GU zuoren nie Bo WANG Hui YAN College of Materials Science and Engineering Beijing University of Technology Beijing 100022 China Department of Material Physics Chemistry University of Science and Technology Beijing Beijing 100083 China

Pseudo-potential and plane wave basis-set under the framework of density functional theory have been employed to study the electronic and magnetic properties of Fe16N2, and to have an insight look on the subject of giant magnetic moments reported in Fe16N2. After geometrical optimization, band structures and densities of states have been evaluated together with the atom resolved band populations and magnetic moments. In this paper, we report a theoretical effort to look into the various aspects of the magnetic properties of Fe16N2, including volume effect and distortion effect.

关键词： Ab initio calculations Magnetic properties Fe16N2

Microstructure and mechanical properties of Al-Mg-Mn alloy with erbium

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Rare Metals 2012年第3期31卷 237-243页

作者： Wang, Xudong Lin, Shuangping Yang, Junjun Tang, Zhenlei nie, zuoren School of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024 China Metal Working Engineering Department China Iron and Steel Research Insititute Group Beijing 100081 China Nonferous Metals Processing Division General Research Institute of Nonferrous Metal Beijing 100088 China College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

The effect of trace element Er on the microstructure and properties of Al-6Mg-0.7Mn-0.1Cr-0.15Ti alloy was investigated. The results show that the ultimate room-temperature and high-temperature strength sof the alloy have not increased obviously with the addition of erbium, but the uniform elongation of alloys decreases from 9% and 27.5% to 5.5% and 22.5%, respectively. The reason is that the addition of Er will first react with Ti, Cr to form Al20Ti2Er, Al8Cr4Er phases. The precipitation strengthening makes up the weakening of grain refinement strengthening. During deformation, the primary Al(TiCr)Er and Al3Er particles fracture first and act as the microcrack sources because of the stress concentration.

关键词： Al-Mg-Mn alloy erbium microstructure mechanical properties

THERMIONIC EMISSION OF CARBONIZED La-Mo CATHODE

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中国有色金属学会会刊：英文版 1999年第2期9卷 26-30页

作者： nie, zuoren Zhou, Meiling Wang, Jinshu Zhang, Jiuxing Zuo, Tieyong Beijing Polytechnic Univ Beijing China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃａｔｈｏｄｅｉｓｔｈｅｃｏｒｅｐａｒｔｏｆｅｌｅｃｔｒｏｎｉｃｄｅｖｉｃｅｂｅｃａｕｓｅｉｔｓｅｒｖｅｓａｓｔｈｅｅｌｅｃｔｒｏｎｒｅｓｏｕｒｃｅａｎｄｉｔｓｑｕａｌｉｔｙｄｉｒｅｃ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃａｔｈｏｄｅｉｓｔｈｅｃｏｒｅｐａｒｔｏｆｅｌｅｃｔｒｏｎｉｃｄｅｖｉｃｅｂｅｃａｕｓｅｉｔｓｅｒｖｅｓａｓｔｈｅｅｌｅｃｔｒｏｎｒｅｓｏｕｒｃｅａｎｄｉｔｓｑｕａｌｉｔｙｄｉｒｅｃｔｌｙｉｎｆｌｕｅｎｃｅｓｔｈｅｌ...

关键词： cathoderareearthmolybdenumthermionic emissionLa2O3

Grain size effect on wear resistance of WC-Co cemented carbides under different tribological conditions

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Journal of Materials Science & Technology 2019年第11期35卷 2435-2446页

作者： Haibin Wang Mark Gee Qingfan Qiu Hannah Zhang Xuemei Liu Hongbo nie Xiaoyan Song zuoren nie College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 100124China National Physical Laboratory Hampton RoadTeddingtonTW110LWUK Xiamen Tungsten Co. Ltd.Xiamen 361009China

The grain-size dependence of wear resistance of WC-Co cemented carbides(with mean WC grain sizes of 2.2μm,1.6μm,0.8μm and 0.4μm,respectively)was investigated under different tribological *** results showed that the grain size had opposite effects on wear resistance of the cemented carbides in dry sliding wear and microabrasion *** the former condition,with decrease of WC grain size hence the increase of hardness,plastic deformation,fracture,fragmentation and oxidation were all mitigated,leading to a drastic decrease in the wear *** the latter condition,pull-out of WC grains after Co removal dominated the wear,so that the hardness of cemented carbide was not a core *** a result,the wear resistance of the cemented carbide generally showed a decreasing trend with decrease of the grain size,except for a slight increase in the ultrafine-grained cemented ***-pass scratching of the cemented carbides under various loads indicated the same failure mechanism as that in the sliding wear ***,the reasons for severe surface oxidation of the coarse-grained cemented carbides were disclosed.

关键词： Cemented carbide Grain size Fracture Surface oxidation Grain pull-out Wear resistance

Research and development of Chinese LCA database and LCA software

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Rare Metals 2006年第z2期25卷 101-104页

作者： GONG Xianzheng nie zuoren Wang Zhihong ZUO Tieyong College of Materials Science and Engineering Beijing University of Technology Beijing 100022 China College of Materials Science and Engineering Beijing University of Technology Beijing 100022 China College of Materials Science and Engineering Beijing University of Technology Beijing 100022 China College of Materials Science and Engineering Beijing University of Technology Beijing 100022 China

This paper detailed introduces the related work for building Chinese National Database, Sinocenter, of materials life cycle assessment (MLCA) and developing the environmental burden dataset of materials. The MLCA database was built in 2004, and the basic framework mainly includes LCA methodology, materials environmental dataset about energy consumption, resource input and environmental emissions. Nowadays, the database contains about fifty-thousand records of the main materials industries, such as cement, iron and steel, nonferrous metal, etc., and also includes the primary LCI data of fossil fuels and electricity grid in China. At the same time, the LCA method localization work is going on, for instance, calculated the resource characterization factors of 42 kinds of metal and 58 sorts of nonmetal, and also obtained some heavy metal impact factors in water. Based on the database, the iron and steel dataset has been developed with the data quality analysis, and some environmental burden data could be queried in our website, ***, in the future. Lastly, according to the framework of the ISO14040 series standards, the antitype of Chinese LCA evaluation system was developed to support materials and products LCA evaluation in China.

关键词： database dataset environmental burden data quality LCI