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Microstructure and tensile properties of Ti-62421S alloy plate with different annealing treatments

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Rare metals 2018年第7期37卷 568-573页

作者： Yong-Ling Wang Xiao-Yun Song Wen Ma Wen-Jing Zhang Wen-Jun Ye Song-Xiao Hui State Key Laboratory of nonferrous metals and Processes General Research Institute for Nonferrous Metals Division of Science and Technology Information General Research Institute for Nonferrous Metals

Ti-62421S （Ti-6A1-2Sn-4Zr-2Nb-lMo-0.2Si） is a novel short-time using high-temperature titanium alloy. The effects of annealing on microstructure and tensile properties of Ti-62421S alloy plate were studied through optical microscopy （OM）, electron probe microanalysis （EPMA）, transmission electron microscopy （TEM）, and tensile tests. The results show that, with annealing tem- perature increasing, the volume fraction of primary α（αp）- phase decreases while that of transformed β（βt）-structure and secondary α （αs）-phase increases. The room-temperature strength and plasticity are insensitive to annealing temperature. However, with annealing temperature increasing, the tensile strength decreases at 550℃, while increases at 600 and 650℃ instead. It is suggested that, at 550℃, the strengthening mechanism is mainly boundary strengthening and the biggest contributor is ap-phase by providing αp/β-boundary area. Above 600 ℃, the strengthening mechanism is grain strengthening, where αs-phase strengthens the β-phase.

关键词： High temperature titanium alloy Ti-62421S Heat treatment Microstructure Tensile properties

Effect of carbide formers on microstructure and thermal conductivity of diamond-Cu composites for heat sink materials

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中国有色金属学会会刊：英文版 2009年第5期19卷 1161-1166页

作者：夏扬宋月清林晨光崔舜方针正 General research institute for nonferrous metals

Diamond-copper composites were prepared by powder metallurgy,in which the diamond particles were pre-coated by magnetic sputtering with copper alloy containing a small amount of carbide forming elements(including B,Cr,Ti,and Si).The influence of the carbide forming element additives on the microstructure and thermal conductivity of diamond composites was *** is found that the composites fabricated with Cu-0.5B coated diamond particles has a relatively higher density and its thermal conductivity approaches 300 W/(m·K).Addition of 0.5%B improves the interfacial bonding and decreases thermal boundary resistance between diamond and Cu,while addition of 1%Cr makes the interfacial layer break away from diamond *** actual interfacial thermal conductivity of the composites with Cu-0.5B alloy coated on diamond is much higher than that of the Cu-1Cr layer,which suggests that the intrinsic thermal conductivity of the interfacial layer is an important factor for improving the thermal conductivity of the diamond composites.

关键词：铜复合材料硬质合金导热系数钻石显微结构散热片金刚石复合材料金刚石颗粒

Microstructural characteristics and paint-bake response of Al-Mg-Si-Cu alloy

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中国有色金属学会会刊：英文版 2008年第1期18卷 126-131页

作者：纪艳丽郭富安潘琰峰 Suzhou institute for nonferrous metals research

The microstructural characteristics and paint-bake response of 6022 alloy with 0.3% Cu(mass fraction)were studied using optical microscope,scanning electron microscope(SEM),transmission electron microscope(TEM)and tensile *** results indicate that the phase constituents in the as-cast microstructure are Mg2Si,Si,Al5Cu2Mg8Si6,Al5FeSi,α-Al(MnCrFe)Si and *** the following homogenization,CuAl2,Al5Cu2Mg8Si6 and Mg2Si phases are almost completely dissolved,and Al5FeSi transforms to α-Al(MnCrFe)Si *** rolling,the phase constituents in the alloy change less except the precipitation of Mg2Si particles,and the precipitation behavior of Mg2Si strongly depends on the thermomechanical *** addition significantly increases the paint-bake response of 6022 alloy by facilitating the formation of β-" ***,the tensile strength of 6022 alloy with 0.3% Cu is higher than that of 6022 alloy without Cu after paint-bake cycle.

关键词： Al-Mg-Si-Cu合金油漆热处理显微结构

New method of direct chill casting of Al-6Si-3Cu-Mg semisolid billet by annulus electromagnetic stirring

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Transactions of nonferrous metals Society of China 2010年第9期20卷 1591-1596页

作者：汤孟欧徐骏张志峰白月龙 General research institute for nonferrous metals

The electromagnetic direct chill （EMDC） casting process is a welt-established production route for aluminum alloy ingot, however, the skin effect restricts the casting diameter. In order to avoid this problem, annulus electromagnetic direct chill （A-EMDC） casting process has been developed. A three-dimension finite element computational model of A-EMDC casting process was established by using ANSYS Magnetic-Nodal programs and FLOTRAN CFD programs. Microstruetures of A-EMDC casting semi-solid Al-6Si-3Cu-Mg alloy billets were investigated. Two pairs of vortexes occur within the crystallizer with opposite direction in A-EMDC. The annulus gap is advantageous to increasing circulate flow, reducing the temperature gradient as well as shallowing liquid sump depth. The microstructure obtained by A-EMDC is globular or rosette-like, and the microstructure is homogeneous in the billet.

关键词： electromagnetic stirring semi-solid continuous casting Al-6Si-3Cu-Mg alloy

Effects of microstructure on creep behavior of Mg-5%Zn-2%Al(-2%Y) alloy

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中国有色金属学会会刊：英文版 2008年第3期18卷 580-587页

作者：邹宏辉 General research institute for nonferrous metals

Creep tests of Mg-5%Zn-2%Al(-2%Y) (mass fraction) alloy were carried out at 175 ℃ under the load of 50 MPa, on the cast and solution condition, respectively. Relationship between the creep behavior and microstructure was studied by the optical microscopy, SEM and TEM. The result shows that the primary creep strain is relative to the thermo-stability and the quantity of intermetallic compounds in grain boundary area. During the secondary creep period, the minimum creep rate of solution-treated specimens is substantially decreased as a result of dynamic MgZn2 precipitation.

关键词：镁合金微结构镁-锌相动力沉淀

Deep drawing of 6A16 aluminum alloy for automobile body with various blank-holder forces

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Rare metals 2019年第10期38卷 946-953页

作者： Zhao-Yang Liu Bai-Qing Xiong Xi-Wu Li Li-Zhen Yan Zhi-Hui Li Yong-An Zhang Hong-Wei Liu State Key Laboratory of nonferrous metals and Processes General Research Institute for Nonferrous Metals

Based on the ABAQUS/explicit finite element method,the deep drawing of 6A16 alloy pre-aged and then storaged at room temperature for 1 week with various blank-holder forces(10,14,18 kN) was *** distribution and variation of stress and strain in deformation zones were investigated to drive the forming property and process of the ***,the simulation result was verified combined with the deep drawing *** results show that the stress and strain of the deformation zone have an incremental trend with the blank-holder force increasing while the deformation degree and grain size within a certain deformation zone have an obvious increase and an enlargement,*** the deep drawing,the hardness of products also increases with the enhancement of blank-holder *** blank-holder force of 18 kN is certified as the preferential one by the analysis of microstructure and simulation results.

关键词： ABAQUS 6A16 aluminum alloy Deep drawing test Blank-holder force

Hot deformation behavior and globularization mechanism of Ti-6Al-4V-0.1B alloy with lamellar microstructure

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Rare metals 2013年第2期32卷 122-128页

作者： Yang Yu Bai-Qing Xiong Song-Xiao Hui Wen-Jun Ye State Key Laboratory of nonferrous metals & Processes General Research Institute for Nonferrous Metals

Hot deformation behavior and globularization mechanism of Ti6A14V0.1B alloy with lamellar micro structure were quantitatively studied through isothermal compression tests with the temperature range of 850950 ℃and strain rate range of 0.011.00 s1. The results show that the peak flow stress and steady stress are sensitive to the strain rate and temperature. The value of deformation activation energy is 890.49 kJmo11 in （a＋β） region. Dynamic recrystallization is the major deformation mecha nism. Flow softening is dominated by dynamic recrystallization at 850950 ℃. TiB particles promote the recrystallization of laths. Globularization processes consist of four steps： for mation of subgrain after dynamic recovery in a plates; subgrain boundary migration caused by interracial instability; interfacial migration promoting phase wedge into a phase; disintegrating of a laths by diffusion processes; and grain boundary sliding. Globularization mechanisms during hot deformation processes of the Ti6A14V0.1B alloy with lamellar structure are continuous dynamic recrystallization.

关键词： Ti-6A1-4V-0.1B Hot deformation Lamellarmicrostructure Globularization mechanism

Spatial distribution of chromium in soils contaminated by chromium-containing slag

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中国有色金属学会会刊：英文版 2009年第3期19卷 756-764页

作者：黄顺红彭兵杨志辉柴立元许友泽苏长青 School of Metallurgical Science and Engineering Central South University hunan research institute of nonferrous metals

To evaluate the metal chromium (Cr) contamination of soil at a chromium-containing slag site by ferrochromium production, the contaminated sites, under slag heap, in the vicinity of slag heap and arable soils near the outlet of sewer channel, and unpolluted site 5 km away from one ferroalloy plant in hunan Province, China, were selected. The concentrations of total Cr and water soluble Cr in bulk soil samples and profile depth samples were determined. The results show that the soils in the vicinity of slag heap have the highest total Cr content followed by the soils under the slag heap and near the outlet of sewer channel of the factory. The mean concentrations of total Cr in the top soils at above three contaminated locations exceed the critical level of Secondary Environmental Quality Standard for Soil in China by 3.5, 5.4 and 1.8 times. In most Cr polluted soils, total Cr has a relative accumulation in soil depth of 40-60 cm, but this trend is not found in unpolluted soils. The average concentrations of water soluble Cr (Ⅵ) in top soils under slag heap and in the vicinity of slag heap are 176.9 times and 52.7 times higher than that in the uncontaminated soils, respectively. However, water soluble Cr (Ⅵ) contents in soils near sewer channel are all low and the values are close to that in the uncontaminated soils. Although water soluble Cr (Ⅵ) content in soil profiles decreases with soil depths, it in soils under slag heap maintains a high level even at a depth of 100-150 cm. The results imply that the transportation of Cr (Ⅵ) can result in a potential risk of groundwater system in this area.

关键词：污染土壤铬渣空间分布环境质量标准土壤样品平均浓度地下水系统下水道

As-cast microstructure of Al-Zn-Mg-Cu-Zr alloy containing trace amount of Sc

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Rare metals 2019年第4期38卷 343-349页

作者： Yu Wang Bai-Qing Xiong Zhi-Hui Li Shu-Hui Huang Kai Wen Xi-Wu Li Yong-An Zhang State Key Laboratory of nonferrous metals and Processes General Research Institute for Nonferrous Metals

It has been reported that the element scandium (Sc) is the most effective modificator which can significantly refine the grain size,prohibit recrystallization process and increase the *** trace of Sc in 7000 series aluminum alloys is considered to be an effective way to modify its microstructure and promote mechanical *** order to study the effect of Sc element on ascast microstructure of Al-Zn-Mg-Cu-Zr alloy,ingots containing different amounts of Sc were prepared by ferrous-mold *** were characterized by means of differential scanning calorimeter (DSC),X-ray diffraction (XRD),optical microscope (OM) and scanning electrical microscope (SEM).The results indicate that when the Sc level exceeds a critical concentration,A13(Sc,Zr) primary phase would form in the melt and act as an efficient nucleant,resulting in very refined grain and an equiaxed grain *** element reduces the number of eutectic phases formed during solidification,coupled with an increase in the concentration of major alloying elements retained in the *** behavior suggests possible benefits in improving the integrated properties of terminal products.

关键词： Scandium Aluminum alloy As-cast Microstructure Nucleant