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Kinetics of oxidation-precipitation of cobalt(Ⅱ) from solution by ozone TIAN Qing-hua(田庆华), GUO Xue-yi(郭学益), YI Yu(易 宇), LI Zhi-hai(李治海) School of Metallurgical Science and Engineering... investigated. The kinetics equation of each condition was established. The results indicate that the oxidation rate is independent of the initial concentration or solution temperature. The oxidation rate......
temperatures after solid solution and aging treatment at 490 ℃ for 1.5 h 图5所示为合金在不同时效条件下的室温拉伸性能变化曲线.由图5可以看出,在不同温度下,随着时效时间的延长,合金的强度不断增加,达到峰值后趋于稳定.温度越高,合金到达强度峰值的时间越短,反之,时间越长,伸长率则随着时效时间的延长而逐渐降低.如图5所示,合金经...短了合金达到峰值硬度的时间,且预变形提高了合金的峰值硬度值. 图5 时效温度对Al-Cu-Li合金拉伸性能的影响 Fig. 5 Effect of aging temperature on tensile properties of Al-Cu-Li alloy 图7所示为经不同预变形量后合金在160 ℃时效的拉伸性能曲线.由图7可以看出,随着时间的延长,合金的抗拉强度和......
J. Cent. South Univ. (2016) 23: 1052-1057 DOI: 10.1007/s11771-016-0354-y Tungsten removal from molybdate solutions using chelating ion-exchange resin: Equilibrium adsorption isotherm and kinetics... words: tungsten; molybdate; ion-exchange resin; isotherms; kinetics 1 Introduction The separation between W and Mo has been a national difficulty due to their extremely similar physicochemical......
Effect of aging on microstructure of Mg-Zn-Er alloys DU Wenbo1,LI Shubo1,LI Jianhui1,WANG Zhaohui1 (1.School of Materials Science and Engineering,University of Technology Beijing,Beijing 100124,China) Abstract:The effect of aging on microstructure of Mg-Zn-Er alloys at 473 K was investigated using hardness measurement, scanning elec-tron microscopy (SEM) and transmission electron microscopy......
J. Cent. South Univ. Technol. (2010) 17: 911-917 DOI: 10.1007/s11771-010-0576-3 Modeling of metadynamic recrystallization kinetics after hot deformation of low-alloy steel Q345B MA Bo(马博)1, 2...-recrystallization kinetics. The metadynamic recrystallization behavior of low-alloy steel Q345B during hot compression deformation was investigated in the temperature range of 1 000-1 100 ℃, the strain rate......
J. Cent. South Univ. Technol. (2011) 18: 985-992 DOI: 10.1007/s11771-011-0791-6 Hydriding and dehydriding kinetics of nanocrystalline and amorphous Mg2Ni1-xMnx (x=0-0.4) alloys prepared by melt... and dehydriding kinetics of the Mg2Ni-type alloys. The nanocrystalline and amorphous Mg2Ni-type Mg2Ni1-xMnx (x=0, 0.1, 0.2, 0.3, 0.4) alloys were synthesized by the melt-spinning technique. The structures......
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and microstructures of 2124 aluminum alloy in creep aging process. The results show that creep strain and creep rate increase with the increase of aging time, temperature and applied stress. The hardness of specimen varies with aging time and stress in a low-to-peak-to-low manner. No significant effect of temperature on hardness of material is seen in the range of 185-195 °C. The optimum......
的提高且有利于缩短生产周期. 图6 Mg-6Zn-2Sm-0.4Zr合金时效处理后的SEM像 Fig. 6 SEM images of Mg-6Zn-2Sm-0.4Zr alloy after aging treatment((a), (b)) and EDS analysis(c) 图8所示为Mg-6Zn-2Sm-0.4Zr合金在不同时效时间下,铸态和固溶态的显微硬度...时间对 Mg-6Zn-2Sm-0.4Zr合金力学性能的影响 Fig. 7 Effects of aging treatment time on mechanical properties of Mg-6Zn-2Sm-0.4Zr alloy 图8 时效处理时间对 Mg-6Zn-2Sm-0.4Zr合金显微硬度的影响 Fig. 8 Effects of aging......