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supersaturation levels because of the continuous introduction of CO2 gas into alkaline solutions [12,13]. Thus, the precipitation rate of carbonization is significantly faster than that of seed precipitation [14... Growth, 1988, 92(1-2): 26-32. [19] MUHR H, LECLERC J P, PLASARI E, NOVELCATTIN F. A rapid method for the determination of growth rate kinetic constants: application to the precipitation of aluminum......
composition of total tailing 图3 塌落度测试图 Fig. 3 Picture of slump test 图4 不同气泡率和质量分数对塌落度的影响 Fig. 4 Influences of different bubble rate and mass fraction on slump 一般认为,泵送膏体塌落度为15~20 cm...明气相成分的加入有效地降低了浆体的黏度,改善了浆体的流变性能. 图5 不同剪切速率下气泡率和质量分数对塑性黏度的影响 Fig. 5 Influence of different bubble rate and mass fraction on viscosity at different shearing rates 将剪切速率60 r/s时,不同质量分数和气泡率情况下塑......
from the phase transformation of GP zone, η′ phase re-solution and η precipitation. Higher heating rate leads to higher temperature of re-solution and more precipitates. The heating rate affects evidently whether the phase transformation process is completed or not during heating to 190 ℃. 4 Discussion 4.1 Effects of retrogression heating rate on RRA microstructures The usual precipitation......
that the diffusion is the main governing factor of precipitation. The cold rolling enhances the rate of precipitation and lowers the nose temperatures, but the recrystallization weakens this effect...出曲线的位置并不随退火温度的升高而不断提高. 为更直观地表述图1析出分数与退火温度和退火时间的关系,对图1数据进行相关处理,如图2所示.图2为经过不同冷轧变形量后,样品在不同退火温度和退火时间下析出分数的等高线分布图,即TTP曲线(Time-Temperature-Precipitation).由图2(a)~(d)所示,在不同的冷轧变形量和退火温度下,随着退火时间的延长,析出分数都不断增大.图2......
–44. DOI: 10.1016/ j.hydromet.2009.03.014. [10] LIU Gui-hua, WU Guo-yu, CHEN Wei, LI Xiao-bin, PENG Zhi-hong, ZHOU Qiu-sheng, QI Tian-gui. Increasing precipitation rate from sodium aluminate solution... ARTICLE J. Cent. South Univ. (2019) 26: 312-322 DOI: https://doi.org/10.1007/s11771-019-4003-0 Intensifying gibbsite precipitation from sodium aluminate solution by adding a mixed seed LI Xiao-bin......
reactor. It can be seen from Table 1 that a great number of fine particles disappear in 9 h when adding fine seed. Since the crystal growth rate is very small in the late period of seeded precipitation... Phenomena in late period of seeded precipitation of sodium aluminate solution LI Xiao-bin(李小斌), FENG Gang-tao(冯港涛), ZHOU Qiu-sheng(周秋生), PENG Zhi-hong(彭志宏), LIU Gui-hua(刘桂华) School......
decomposes and precipitation occurs. At the early aging stage of 120 ℃, GP zones form and then grow up gradually with increasing ageing time. η′ phase forms after ageing for 4 h and η phase starts to occur after 24 h aging. Key words: 7055 aluminum alloy; aging; precipitation, microstructure; property ......
to the required temperatures under continuous electromagnetic stirring. The stirring rate remained constant during each test and was about 250 r/min. Finally, in the precipitation stage, the solution...Trans. Nonferrous Met. Soc. China 23(2013) 134-139 Nanostructured MnO2 synthesized via methane gas reduction of manganese ore and hydrothermal precipitation methods Davood MORADKHANI1, Mahdieh......
; 文章编号:1672-7207(2013)06-2223-07 Precipitation behaviors and mechanical properties of Mg-6Gd-Y-0.6Zr alloy ZHANG Xinming1, 2, MU Zongyun1, 2, DENG Yunlai1, 2, TANG Changping1... of Education,Central South University, Changsha 410083, China) Abstract: The effect of 1% Y (mass fraction) addition on the precipitation behaviours and mechanical properties of Mg-6Gd-0.6Zr alloy were......
for 57%-99%, 50%-89%, and 40%-91% of their initial total amount, respectively. With the increase of aragonite precipitation rate, more lanthanides were incorporated into aragonite while their relative fraction in aragonite overgrowths decreased consistently. It indicated that the coprecipitation of lanthanides with atagonite was controlled by the kinetics of aragonite precipitation. Key words......
