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Surface modification of spherical LiNi1/3Co1/3Mn1/3O2 with Al2O3 using heterogeneous nucleation process YANG Zhi(杨 志), LI Xin-hai(李新海), WANG Zhi-xing(王志兴), ZHU Yong-jun(朱勇军) School..., spherical LiNi1/3Co1/3Mn1/3O2 was coated with Al2O3 by using heterogeneous nucleation process, and the physical and electrochemical properties were studied. The SEM images show that there is a uniform......
refin efficiency. Key words: Al-5Ti-B alloy; grain refinement; casting; inoculation; nucleation 1 Introduction It is well known that an equiaxed grain structure manifests more enhanced mechanical... and TiB2 particles present in the Al-5Ti-B master alloy provide heterogeneous nucleation sites for the solid grain [1-3,7, 8,15,17]. However, the size and morphology of those particles should......
(HCP) crystal structure can serve as the nucleating sites of α-Mg during solidification, and heterogeneous nucleation is the main reason of the grain refinement of α-Mg grains. Key words: Mg-7Al-0.4Zn-0.2Mn alloy; Al3Ti4B; grain refinement; heterogeneous nucleation 镁合金是迄今在工程应用中最轻的金属结构材料, 具有比强度高, 比刚度高, 阻尼减震性能好, 电磁屏蔽性能和机械加工性能优异的特点, 被誉为"21世纪最具发展潜力和前途的绿色工程材料" [1-3]. 但由于镁具有密排六方(HCP)晶体结构......
: magnesium alloy; Mn; grain refinement; heterogeneous nucleation Mg-Al系合金是目前工业中使用量最大的镁合金系列.但该类镁合金的铸造件在生产过程中常常由于初生枝晶过分粗大,导致疏松,偏析,热裂等铸造缺陷的发生[1-3].因此,控制得到细致均匀的等轴晶组 织是改善Mg-Al系合金铸造性能和提高合金铸锭质量的重要途径.研究表明[3-4],杂质元素如...; 文献标志码:A Effect of Mn on grain size of high-purity Mg-3Al alloys WANG Chun-jian, JIN Qing-lin, ZHOU Rong, JIANG Ye-hua (Faculty of Material Science and Engineering, Kunming......
for grain structure formation based on the Monte Carlo method was carried out, and the frequency of heterogeneous nucleation in the alloy was evaluated by producing similar structure with the experimental... nucleation during the solidification of Al-Si binary alloy was estimated by comparing experimentally obtained macrostructures of castings with numerically simulated ones. A molten alloy......
Nucleation mechanism of a nickel-base superalloy during dynamic recrystallizationShuai WANG 1) , Lei WANG 1) , Yang LIU 1) , Guohua XU 2) , Beijiang ZHANG 2) and Guangpu ZHAO 2) 1) Key Laboratory...摘 要:Hot compression test was carried out at 1000℃ to investigate the dynamic recrystallization nucleation mechanism of a nickel-base superalloy......
Grain nucleation and growth behavior of a Sn-Pb alloy affected by direct current: An in situ investigationFenfen Yang1,Zongning Chen1,2,Fei Cao1,Rong Fan3,Huijun Kang1,Wanxia Huang4,Qingxi...="ChDivSummary">In situ synchrotron X-ray radiography was used to study the effect of direct current(DC) on the grain nucleation and growth of Sn-50 wt.%Pb alloy. The results showed that applying DC adequately......
mixed stress conditions. Similar nucleation sites were found during uniaxial tension for Ti-6Al-4V and Ti-6242 alloy with transformed beta microstructure[10, 12-13]. Fig.3 SEM micrographs of grain.... The distribution indicates that the sites for cavity nucleation preferentially occur along the prior beta grain boundaries orienting 45° to the compression axis. It is similar to the orientation of grain boundary......
. Key words: 7A55 aluminium alloy; trace elements; grain refinement; nucleation 超高强Al-Zn-Mg-Cu合金因合金化程度高, 易产生枝晶偏析, 晶界共晶组织粗大, 导致熔铸成型困难, 热轧开坯易开裂. 添加微量元素细化合金的铸锭组织, 能够显著提高合金的强度, 断裂韧性, 改善合金的加... Xin-ming (School of Materials Science and Engineering,Central South University, Changsha 410083, China) Abstract: The grain refinement effect and mechanism by addition of trace Cr, Mn, Ti and Zr......
for grain refinement and the undissolved AlB2 particles is the indirect nucleating base for subsequent α(Al) phase. Key words: Al-3B master alloy; hypoeutectic Al-Si alloys; nucleation mechanism; grain... at 659.7 °C, which is higher than the nucleation temperature of α(Al). So the solid Al created by this reaction can act directly as the nucleation substrate of subsequent α(Al) so as to cause the grain......