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Fifth International Conference on Surface Engineering

作者： J.Gao Z.L.Wu Z.P.Zhang B.S.Cao M.K.Lei Surface Engineering Laboratory School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

The Fe/Cu nanometer-scale multilayers of nominal modulation wavelengths from 5 to 40 nm with alternating Fe and Cu sublayers thickness ratio 1:1 are deposited by direct current magnetron sputtering on Si（100） *** and morphology of the multilayers are examined by small angle /wide angle x-ray diffraction（SA/WAXRD） and cross-sectional transmission electron microscopy（XTEM）.Residual stress in the multilayers is estimated by using *** of the multilayers is measured by using *** the multilayers have Fe（110） and Cu（111） texture,and the grain sizes of the mulitlayers increase from 5 to 17 nm with the increase of the modulation wavelength from 5 to 40 nm,*** sharp interfaces in the multilayers present an increasing lateral roughness with increasing the modulation wavelength,and no interfacial phase is observed in all *** tensile residual stresses in the multilayers increase from 183 to 627 MPa with increasing modulation wavelengths from 5 to 40 *** coalescence mechanism can be applied to explain the evolution of the residual stress in the multilayers with the change of modulation *** addition,the thermal misfit also significantly contributes to the total residual *** multilayers with modulation wavelength of 10 nm exhibits the highest hardness of 7.29±0.29 *** super-hard effect is found in the *** hardness variations with changing the modulation wavelength of the multilayers could be qualitatively interpreted by the Koehler model.

关键词： Fe/Cu nanometer-scale multilayers Microstructure Residual stress nanoindentation hardness

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Carbide Precipitation in Ferrite in Nb–V-Bearing Low-Carbon Steel During Isothermal Quenching Process

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Acta Metallurgica Sinica(English Letters) 2017年第11期30卷 1067-1079页

作者： Xiao-Lin Li Cheng-Shuai Lei Xiang-Tao Deng Yan-Mei Li Yong Tian Zhao-Dong Wang Guo-Dong Wang State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

The precipitation behavior of nanometer-sized carbides in ferrite in Nb-V-bearing low-carbon steel was studied by electron microscopy and nanoindentation hardness measurements. The results indicated that interphase precipitation and random precipitation could occur simultaneously for the specimen isothermally treated at 700 ℃ for 60 min, while in other specimens, only random precipitation was observed. This phenomenon might be explained by mass balance criterion during the diffusional phase transformation. Nanohardness result indicated that the average hardness of the specimens isothermally held at 600 ℃ for 20 min was 3.87 GPa. For the specimen isothermally holding at 650 ℃ for 20 min, the average hardness was 4.10 GPa and the distribution of the nanohardness was in a narrower range compared with that of the specimen isothermal holding at 600 ℃ for 20 min. These implied that the carbides in the specimens isothermal treated at 650℃ were more uniformly dispersed, and the number density of the carbides was greater than that treated at 600 ℃. Using Ashby-Orowan model, the contribution of precipitation strengthening to yield strength was estimated to be 110 MPa for the specimen isothermally treated at the temperature of 650 ℃ for 20 min.

关键词： High-strength low-alloy(HSLA) Interphase precipitation Carbides nanoindentation hardness High-resolution transmission electronic microscopy(HRTEM)

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Sintering densification behavior and kinetic mechanism of nano-tungsten powder prepared by sol-spray drying

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Tungsten 2020年第4期2卷 371-380页

作者： Zhi‑Yuan Du Yong‑Qi Lv Yong Han Jing‑Lian Fan Lei Ye State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Due to its excellent mechanical and radiation resistance performance,fine-grained tungsten becomes an ideal plasma facing material in fusion ***,the preparation of fine-grained tungsten by ultrafine powder is faced with some problems,such as low density,coarse grain and not suitable for engineering *** this paper,nano-tungsten powders prepared by“sol-spray drying-calcination-hydrogen thermal reduction”process were sintered by non-isothermal ordinary pressureless sintering,and the densification behavior and kinetic mechanism were *** results show that there exists two stages during sintering process,namely significant densification process at low temperature(1300-1700℃)and grain growth stage at high temperature(1700-2000℃).Finally,bulk tungsten material with the relative density of 96.9%and average grain size of 2-6μm was prepared at 1900℃.Moreover,electron backscatter diffraction results show the grain size is uniform and *** mathematical calculation,the nanocrystallization of tungsten powder significantly reduces the sintering activation energy and promotes the densification of tungsten powder at low *** diffusion is the main transport mechanism in grain growth *** is easy to find that the hardness of material increased with the sintering temperature increasing,at the end of sintering densification(>1700℃),TEM observation revealed that the inner pores formed by particle combine were gradually eliminated through grain boundary diffusion with the sintering temperature increasing,resulting in the intra-crystal densification to increase the hardness of tungsten material.

关键词： Nano-tungsten powder Sintering densification Electron backscatter diffraction Kinetics nanoindentation hardness

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