共搜索到449条信息，每页显示10条信息，共45页。用时：0小时0分0秒437毫秒
) on the solidification behaviors and morphologies of Sn-Bi alloys was studied further. The results show that the undercooling of the primary and eutectic phase increases and the microstructure becomes finer after.... These investigations would be beneficial to further exploration of the correlation between the melt structure and the micro mechanism of solidification. Key words: liquid-liquid structure transition; undercooling......
......
the maximum undercooling of 328 K (0.24TL) with glass fluxing method, and it displayed triple solidification mechanisms. A critical undercooling of 24 K was determined for metastable liquid phase separation. At lower undercoolings, α-Fe phase was the primary phase and the solidification microstructure appeared as homogeneous well-defined dendrites. When the undercooling exceeded 24 K, the sample segregated......
......
......
of primary silicon are obviously dependent on the nucleation undercooling. The critical undercooling ΔT1, for the growth-mode transition from lateral mode to intermediary one, and the critical undercooling ΔT2, for the growth-mode transition from intermediary mode to continuous one, both decrease with increasing the RE addition level. When the RE content is 1.5% (mass fraction, %), the values of ΔT1......
4 1;陕西省自然科学基金!资助项目 98C1 3; Effect of glass composition on undercooling stability of Cu50Ni50 alloy melts Abstract: The undercooling and its... undercooling during superheating cooling cycle. Taking 79% SiO 2+12.5% B 2O 3+ 2.2% Al 2O 3+0.6% CaO+5.7% Na 2O as purifying agent, the denucleating mechanism is a comprehensively physicochemical......
undercooling. Meanwhile, the relationship between microstructure of undercooled K4169 superalloy and tensile properties was investigated. The experimental results show that the uniform distribution of Laves phase and the decrease of grain size and intergranular phase content are favorable for the improvement of mechanical properties. The maximum tensile strength and elongation obtained at undercooling......
, according to the relationship between undercooling and solidification plateau time. Meanwhile, the measured density, viscosity and surface tension of molten zirconium display a linear increase... agrees well with the theoretical prediction of LKT/BCT rapid dendritic growth model. The dendritic growth velocity shows a power increase relationship with undercooling, which reaches 48 m/s......
......
