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, the randomly distributed equiaxed particles are obtained with isotropic characteristic. It is coarsening that follows the Ostwald ripening mechanism: smaller particles dwindle and larger particles grow......
holding 5min, the semisolid grains become coarse and the coarsening mechanism is Ostwald ripening.
Key words: magnesium alloy; SIMA semisolid; granulating; microstructural evolution
Ostwald ripening[J]. Acta Metall, 1998, 46(18): 6541-6550.
. Semisolid metal processing[J]. International Materials Reviews, 2002, 47(2): 49-85. [14] KANG M K, KIM D Y, NONG M H. Ostwald ripening kinetics of angular grains dispersed in a liquid phase by two... is too high or holding time is too long, the semi-solid particles will combine and grow up, the microstructural evolution mechanism is consistent with the rule of Ostwald ripening mechansim. The best......等温热处理对Mg-7Zn-0.3V合金半固态组织演变的影响
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来源: 《中国有色金属学报2018年第8期》——黄晓锋 郭峰 张玉 杨健长 马亚杰 张乔乔
">Oriented attachment and Ostwald ripening are two aging mechanisms of precipitation particles which may result in different crystallization mechanism of precipitates during the aging process. In this work...(LaPr)0.10O2 solid solution with homogenous phase structure was generated by Ostwald ripening aging process, exhibiting higher oxygen storage capacity(501 μmol O2/g) and H2 consumption per gram(1378.3......
">Oriented attachment and Ostwald ripening are two aging mechanisms of precipitation particles which may result in different crystallization mechanism of precipitates during the aging process. In this work...(LaPr)0.10O2 solid solution with homogenous phase structure was generated by Ostwald ripening aging process, exhibiting higher oxygen storage capacity(501 μmol O2/g) and H2 consumption per gram(1378.3......
, and finally are coarsened owing to Ostwald ripening. Key words: magnesium alloy; partial remelting; thixoforming; microstructure evolution; phase transformation; in-situ composite 1 Introduction... that the particle coarsening regime transfers from a severe regime to a mild regime after 30 min. The Ostwald ripening is a process in which a semisolid system lowers its interfacial energy by reducing its......
studies. The results showed that the morphology and structures of Cu2O particles were greatly affected by the concentration of pH value of the reaction environment and the reaction time. Ostwald ripening process is proposed to explain the growth mechanism of the hollow octahedral nanostructures.关键词:......
the classical Ostwald ripening. Keywords: AlSi9Cu3 alloy; microstructure evolution; rheocasting; interface instability; growth; coarsening 1 Introduction Since the semi-solid metal (SSM) forming... and Ostwald ripening generally control grain coarsening, and Ostwald repining is the main mechanism when the liquid fraction is relatively high[19]. In accordance with our observations (Figs.2-3......
低温无模板法制备TiO2空心球及其光电性能陈漾湖南有色金属研究院湖南美特新材料科技有限公司摘 要:基于Ostwald熟化作用的机理,采用无模板法,在低温水热条件下制备了Ti O2空心球(Ti O2-HS).探讨了水热反应时间和表面活性剂的种类对Ti O2-HS形貌的影响.在以Ti(SO4)2为钛源,尿素为表面活性剂,180℃水热反应15 h后得到了微米级,锐钛矿型的Ti O2-HS,比表面积和孔容积分别达到了100.728 m2/g,0.270 cm3/g,平均吸附孔径为10.718 nm.将Ti O2-HS应用于染料敏化太阳能电池的光阳极,光电转换效率达到5.48%.表明空心球结构提高了材料的比表面积,增强了光子吸收效率,光电性能得到了很大提高.关键词:Ostwald熟化;无模板法;水......
Ostwald ripening,and instead follows a Sigmoidal rate curve.The heat change associated with the growth determined by isothermal titration calorimetry is about 10 kcal.mo1-1per 1 nm increase... ZnO nanorods.Accordingly,the time dependence on the length of uncapped nanorods follows the L3 law as required for diffusion-limited Ostwald ripening.The PVP-capped nanorods,however,show a time......