Based on the advanced integrated technology of materials preparation and formation, a new pattern Zn-Al-Mg-RE anti-corrosion coating for steel structure sustainable design was manufactured by cored wires and high velo...Based on the advanced integrated technology of materials preparation and formation, a new pattern Zn-Al-Mg-RE anti-corrosion coating for steel structure sustainable design was manufactured by cored wires and high velocity arc spraying (HVAS) technologies. The developments of thermally sprayed coatings for steel structure protection were described. Based on Al, Zn, Zn-Al and Zn-Al-Mg coatings, the anti-corrosion properties of new-pattern Zn-Al-Mg-RE coating were evaluated through electrochemical methods including electrochemical polarization and electrochemical impedance spectroscopy (EIS) coupled with SEM and XRD. The models of Zn-Al-Mg-RE coating undergoing corrosion with the initial pinhole defect and the latter with accelerated products were also discussed. The results show that Zn-Al-Mg-RE coating exhibites excellent corrosion resistance for long-term immersion, which is helpful for the sustainable design of steel structure in aggressive corrosion conditions. And the corrosion products seem to possess certain self-sealing function.展开更多
The solidification paths of Al-Zn-Mg-Cu alloys and its precipitation behavior are analyzed using software package JMatPro 6.0 for material property simulation of Al-base alloys.The microstructures of the experimental ...The solidification paths of Al-Zn-Mg-Cu alloys and its precipitation behavior are analyzed using software package JMatPro 6.0 for material property simulation of Al-base alloys.The microstructures of the experimental alloys are analyzed;the experimental results of microstructural analysis are in agreement with the thermodynamic prediction.Through orthogonal experimental method,this paper designs the composition of Al-Zn-Mg-Cu alloys by studying the variation of η(MgZn2) phase,S(Al2CuMg) phase,T(AlZnMgCu) phase amount and precipitation temperatures with different Zn,Mg and Cu contents.It is found that with the optimum mass fraction of Zn of 6.7%,Mg of 2.2%-2.5% and Cu of 1.6%-2.0%,the mass fraction of η phase can be up to 8.7%-9.22% and that of S phase and T phase can be lower than 0.5%.展开更多
The hypoeutectic Al-Si alloy billet with non-dendrite was reheated to meet the needs of the semi-solid thixoforming microstructure by four kinds of reheating power,achieving the same final temperature of 851 K.Subsequ...The hypoeutectic Al-Si alloy billet with non-dendrite was reheated to meet the needs of the semi-solid thixoforming microstructure by four kinds of reheating power,achieving the same final temperature of 851 K.Subsequently,under the same condition of thixoforming,the microstructure,surface hardness and tensile properties were observed.Afterwards,quantitative analysis was made for the microstructures of the reheated semi-solid of billet and the thixoforming parts.The results show that when the induction reheating power is 90 kW,the average grain size of the semi-solid billet is the minimum,the microstructures of the thixoforming samples also are the finest,and the mechanical properties of the relevant thixoforming samples are the best.Furthermore,after studying on the relationship between the microstructures of the semi-solid billet of aluminum alloy and the mechanical properties of the thixoforming samples,the reverse design of microstructure is primarily achieved.Finally,the effectiveness of the reverse design for semi-solid microstructure is confirmed by an actual automobile part with complex shape.展开更多
核电站中乏燃料储存格架用到的中子吸收材料需要兼具结构和功能一体化的要求,本文提出用碳纤维Cf增强B4C/Al中子吸收复合材料。利用Monte Carlo方法对碳纤维增强铝基碳化硼中子吸收材料(Cf/B4C/Al)的中子透射率进行模拟计算,研究B4C含量...核电站中乏燃料储存格架用到的中子吸收材料需要兼具结构和功能一体化的要求,本文提出用碳纤维Cf增强B4C/Al中子吸收复合材料。利用Monte Carlo方法对碳纤维增强铝基碳化硼中子吸收材料(Cf/B4C/Al)的中子透射率进行模拟计算,研究B4C含量、Cf含量、不同能量中子入射以及材料厚度变化时对中子透射率的影响,并与B4C/Al材料进行比较。结果表明,在1 e V-0.1 Me V能量范围的中子入射下,当B4C含量小于35%时,加入碳纤维能明显改善B4C/Al材料的中子屏蔽性能;在100 e V中子入射下,材料的中子透射率随B4C含量增加呈现指数下降;且Cf/B4C/Al材料的中子透射率随碳纤维含量增加持续降低;当Cf含量达到10%时,材料中子透射率降至最低,之后趋于平稳。通过模拟计算,得到Cf/B4C/Al材料的各组分的最优配比为35 vol.%B4C和10 vol.%Cf。展开更多
文摘Based on the advanced integrated technology of materials preparation and formation, a new pattern Zn-Al-Mg-RE anti-corrosion coating for steel structure sustainable design was manufactured by cored wires and high velocity arc spraying (HVAS) technologies. The developments of thermally sprayed coatings for steel structure protection were described. Based on Al, Zn, Zn-Al and Zn-Al-Mg coatings, the anti-corrosion properties of new-pattern Zn-Al-Mg-RE coating were evaluated through electrochemical methods including electrochemical polarization and electrochemical impedance spectroscopy (EIS) coupled with SEM and XRD. The models of Zn-Al-Mg-RE coating undergoing corrosion with the initial pinhole defect and the latter with accelerated products were also discussed. The results show that Zn-Al-Mg-RE coating exhibites excellent corrosion resistance for long-term immersion, which is helpful for the sustainable design of steel structure in aggressive corrosion conditions. And the corrosion products seem to possess certain self-sealing function.
文摘The solidification paths of Al-Zn-Mg-Cu alloys and its precipitation behavior are analyzed using software package JMatPro 6.0 for material property simulation of Al-base alloys.The microstructures of the experimental alloys are analyzed;the experimental results of microstructural analysis are in agreement with the thermodynamic prediction.Through orthogonal experimental method,this paper designs the composition of Al-Zn-Mg-Cu alloys by studying the variation of η(MgZn2) phase,S(Al2CuMg) phase,T(AlZnMgCu) phase amount and precipitation temperatures with different Zn,Mg and Cu contents.It is found that with the optimum mass fraction of Zn of 6.7%,Mg of 2.2%-2.5% and Cu of 1.6%-2.0%,the mass fraction of η phase can be up to 8.7%-9.22% and that of S phase and T phase can be lower than 0.5%.
文摘The hypoeutectic Al-Si alloy billet with non-dendrite was reheated to meet the needs of the semi-solid thixoforming microstructure by four kinds of reheating power,achieving the same final temperature of 851 K.Subsequently,under the same condition of thixoforming,the microstructure,surface hardness and tensile properties were observed.Afterwards,quantitative analysis was made for the microstructures of the reheated semi-solid of billet and the thixoforming parts.The results show that when the induction reheating power is 90 kW,the average grain size of the semi-solid billet is the minimum,the microstructures of the thixoforming samples also are the finest,and the mechanical properties of the relevant thixoforming samples are the best.Furthermore,after studying on the relationship between the microstructures of the semi-solid billet of aluminum alloy and the mechanical properties of the thixoforming samples,the reverse design of microstructure is primarily achieved.Finally,the effectiveness of the reverse design for semi-solid microstructure is confirmed by an actual automobile part with complex shape.
文摘核电站中乏燃料储存格架用到的中子吸收材料需要兼具结构和功能一体化的要求,本文提出用碳纤维Cf增强B4C/Al中子吸收复合材料。利用Monte Carlo方法对碳纤维增强铝基碳化硼中子吸收材料(Cf/B4C/Al)的中子透射率进行模拟计算,研究B4C含量、Cf含量、不同能量中子入射以及材料厚度变化时对中子透射率的影响,并与B4C/Al材料进行比较。结果表明,在1 e V-0.1 Me V能量范围的中子入射下,当B4C含量小于35%时,加入碳纤维能明显改善B4C/Al材料的中子屏蔽性能;在100 e V中子入射下,材料的中子透射率随B4C含量增加呈现指数下降;且Cf/B4C/Al材料的中子透射率随碳纤维含量增加持续降低;当Cf含量达到10%时,材料中子透射率降至最低,之后趋于平稳。通过模拟计算,得到Cf/B4C/Al材料的各组分的最优配比为35 vol.%B4C和10 vol.%Cf。
