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He, Qubo,Pan, Fusheng,Wang, Dongzhe,Liu, Haiding,Guo, Fei,Wang, Zhongwei,Ma, Yanlong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1
The microstructure and texture of three 316L foils of 25 ㎛ thickness, which were subjected to different manufacturing process, were systematically characterized using advance analytical techniques. Then, the electrochemical property of the 316L foils in simulated pressurized water reactor (PWR) solution was analyzed using potentiodynamic polarization. The results showed that final rolling strain and annealing temperature had evident effect on grain size, fraction of recrystallization, grain boundary type and texture distribution. It was suggested that large final rolling strain could transfer Brass texture to Copper texture; low annealing temperature could limit the formation of preferable orientations in the rolling process to reduce anisotropy. Potentiodynamic polarization test showed that all samples exhibited good corrosion performance in the simulated primary PWR solution.
Muhammad Rashad,Fusheng Pan,Aitao Tang,Muhammad Asif,Shahid Hussain,Jun Gou,Jianjun Mao 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
The Mg–Al–graphene nanoplatelets (GNPs) nano-composites were synthesized using the powder metallurgy method. The effect of Al–GNPs hybrids addition in to pure Mg was examined through tensile and Vicker hardness tests. The GNPs content was kept constant (0.18 wt.%) and Al content was varied from 0.5 wt.% to 1.5 wt.%. The increase in Al content led to increase in 0.2%YS, UTS and failure strain (%). However for Al content exceeding over 1 wt.%, the failure strain(%) started to decrease. The best improvement was achieved with 1 wt.% Al (Mg–1.0Al–0.18GNPs). Mechanical strength of synthesized composites proved to be better than Mg–Al–CNTs and Mg–ceramic composites.
Powder metallurgy of Mg–1%Al–1%Sn alloy reinforced with low content of graphene nanoplatelets (GNPs)
Muhammad Rashad,Fusheng Pan,Muhammad Asif,Aitao Tang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The Mg–1%Al–1%Sn–0.18% graphene nanoplatelets (GNPs) composite is fabricated by semi powdermetallurgy method followed by hot extrusion. Microscopic observation revealed the uniformdistribution of GNPs in the matrix. The addition of 0.18 wt% GNPs to Mg–1wt%Al–1wt%Sn alloy leadto increase in tensile strength (i.e., from 236 to 269 MPa). The increase in strength of the composite couldbe due to high specific surface area, superior nano-filler adhesion and two-dimensional structure ofGNPs.
Dongdong Gu,Jian Peng,Jiawen Wang,Fusheng Pan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
The evolution of microstructure and mechanical properties of the dilute Mg–Gd alloy with Mn modification were investigatedsystematically in this paper. The results show that the combination of Mn and different processing states could adjust thesolid solubility of Gd in the Mg matrix, thereby changing the morphology of the second phases and improving the propertiesof the alloy. With the addition of 0.8 wt% Mn into the Mg–4Gd alloy, the atomic utilization ratio of Gd atoms decreasesfrom 61.5 to 51.8% during the water-cooling casting process, but it increases from 73.8 to 81.0% during homogenizationtreatment and increases from 72.3 to 84.1% during hot extrusion. Thus, the mean diameter of granular phases of the Mg–4Gd alloy is larger than that of Mg–4Gd–0.8Mn alloy after the isothermal heat treatment. The Mn addition has little effecton the Hall–Petch constant KYand KHof Mg–4Gd alloy, but improves the σ0 value significantly due to the increase of theatomic utilization ratio of Gd atoms. Mn element can improve the mechanical properties of Mg–4Gd alloy, and the increaseof yield strength and ductility of as-extruded Mg–4Gd–0.8Mn alloy is mainly attributed to grain refinement and the decreaseof the texture intensity.
Effect on Zn on Microstructures and Mechanical Properties of Mg–Gd–Y–Zn LPSO Alloys
Jonghyun Kim,Hongxin Liao,Xiang Ou,Zhaobin Zhang,Kaikai Kang,Taekyung Lee,Fusheng Pan 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.11
In this study, the microstructures and mechanical properties of Mg–1Gd–1Y–xZn alloys (x = 0.2, 0.4, 0.6, and 0.8) wereinvestigated. Microstructural evolution was tracked during the process of casting, homogenization, and extrusion. Long-periodstacking-ordered (LPSO) and β phases were formed in the as-cast alloys. The volume fraction of the LPSO phase increasedwith increasing Zn content, whereas that of the β phase decreased. Although the homogenization dissolved the β phase intothe Mg matrix, there was no significant change in the volume fraction of the LPSO phases. Increasing the Zn content led toa slight reduction in grain size and a simultaneous strengthening of texture. The Mg–1Gd–1Y–0.2Zn alloy possessed a highdensity of fine LPSO phases and excellent reinforcement capacity, thereby exhibiting excellent mechanical properties atroom temperature. In addition, the low volume fraction of the LPSO phases in this alloy led to suppressed yield asymmetry.
Hansong Xue,Weina Zhang,Xinyu Li,Xiaochang You,Jinsong Rao,Fusheng Pan 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
Samarium oxide (Sm2O3) nanoparticles with a narrow sizedistribution were successfully synthesized by microwaveassistedusing urea as precipitant without surfactant ortemplate. The Sm2O3 particles were characterized using X-raydiffraction analysis, field-emission scanning electronmicroscopy, field-emission transmission electron microscopyand ultraviolet-visible-near-infrared spectrophotometer. Theresults showed that the samples prepared with differentconcentration of urea had different particle sizes. When theconcentration of urea was 1.2 mol/L, the sample had thesmallest particle size. A possible mechanism for the formationof the nanoparticles was proposed. Optical properties ofSm2O3 nanoparticles showed that the nanoparticles had astrong absorption property in the deep ultraviolet regionbetween 200 nm and 270 nm.
Yanning Chen,Liang Wu,Wenhui Yao,Jiahao Wu,Yuan Yuan,Bin Jiang,FuSheng Pan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
The MgAl Layered double hydroxides (LDHs)/graphene oxide (GO) composite film was fabricated in situon the micro-arc oxidation (MAO) film (MAO/LG) of AZ31 magnesium alloy in one step by hydrothermalchemical conversion method. The growth behavior and corrosion properties of LG films were investigated. The results show that the chemical structure, composition and morphology of the LG film willgradually change with the extension of the hydrothermal treatment time based on using the selfdissolvedcation (Mg2+ and Al3+) in the MAO film as the source of growing LDHs without introducingany external metal cations. The potentiodynamic polarization showed that the MAO/LG-12 h coating(1.28 109 A/cm2) after in situ growth for 12 h was more corrosion resistant than the MAO coating(8.49 106 A/cm2). The synergistic effect of GO and LDHs can significantly improve the corrosion protectionability of MAO coating. In addition, the transition process of the growth behavior of the LG filmlayer on the MAO coating is explained in detail.
Deformation Behavior of the Mg–Zn–Ca–Ce Alloy Sheets Subjected to Uniaxial and Biaxial Tensile Tests
Guangang Wang,Guangsheng Huang,Ke Liu,Junlei Zhang,Bin Jiang,Aitao Tang,Fusheng Pan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
The uniaxial tensile test and Erichsen test are performed on the different deformation behavior under different stress states. The materials used in this paper had obvious anisotropy in the rolling plane because of the bimodal textures along the transversedirection. However, the Mg alloy with the weakest texture distribution did not get the better plasticity and formability,which was related to the enhanced grain boundary cohesion by more Zn addition. The rate of dislocations storage was independentof load direction for a given Mg alloy, even if Mg alloy has large in-plane anisotropy at lower stress levels. Therewas something different from the work hardening behavior in stage III between the ZXE0500 alloy and ZXE1500 alloy inthree load directions because of the dynamic recovery. Tension twin is easier to be activated on ZXE1500 alloy rather thanZXE0500 alloy. Because the crack edge of samples used for the Erichsen test went through non-equal biaxial tensile stress,and the strain in the radial direction was much larger than that of the circumferential direction, so the texture evolution wassimilar to the uniaxial tensile stress.
Ying Zeng,Bin Jiang,Ouling Shi,Gaofen Quan,Salih Al-Ezzi,FuSheng Pan 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.4
Some alloying elements (Al, Er, Gd, Li, Mn, Sn, Y, Zn) were proved recently by calculations or experiments to improve theformability of Mg alloys, but ignoring their site preference in Mg crystals during the calculated process. A crystallographicmodel was built via fi rst principle calculations to predict the site preferences of these elements. Regularities between dopingelements and site preferences were summarized. Meanwhile, in the basis of the crystallographic model, a series of formulaswere deduced combining the diff raction law. It predicted that a crystal plane with abnormal XRD peak intensity of the Mgbasedsolid solutions, compared to that of the pure Mg, prefers to possess solute atoms. Thus, three single-phase solid solutionalloys were then prepared through an original In-situ Solution Treatment, and their XRD patterns were compared. Finally,the experiment further described the site preferences of these solute atoms in Mg crystal, verifying the calculation results.
Enhancing mechanical properties of Mg-Gd-Y-Zn alloys via microalloying with Ce and La
Zhaobin Zhang,Jonghyun Kim,Hongxin Liao,김기범,최태집,이태경,FuSheng Pan 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.9
This study investigated the microstructure and mechanical properties of Mg-1Gd-1Y-1Zn (at.%) alloys containing designed amounts of Ce or La. The Mg5(Gd,Zn) phase formed in the as-cast Mg-Gd-Y-Zn- Ce/La alloys and disappeared after a homogenization treatment at 500°C for 24 h. The addition of Ce and La resulted in the formation of Ce(Mg,Zn)12 and La(Mg,Zn)12 phases, respectively. Except for that, the Ce or La addition had no significant effect on the morphology, volume fraction, and type of the long-period stacking ordered (LPSO) phases in the Mg-Gd-Y-Zn alloy. The grain size decreased with increasing microalloying content because the heavy Ce and La atoms impeded atomic migration across the boundaries. The solute drag effect led to the formation of the rare earth texture in the extruded Mg-Gd-Y-Zn-Ce/La alloys, whose extent decreased with increasing microalloying content. The mechanical strength was improved by the addition of Ce or La at the sacrifice of ductility. In particular, La exhibited a stronger reinforcement ability than Ce when it was added to the Mg-Gd-Y-Zn alloys. Among the investigated chemical compositions, the Mg-1Gd-1Y-1Zn- 0.3La alloy exhibited the highest strength because it had the finest grains, the highest volume fraction of the second phase, and the weakest texture intensity. Furthermore, the alloys showed an unusual yield asymmetry due to the difference in the deformation mode of the LPSO phase.