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研究了熔体分散混合法制备的半固态浆料初生相形成过程。通过对浆料组织EPMA和金相组织层剥离等试验、熔体分散混合工艺处理熔体的过冷度测定,描述了球状初生相的形成机制。结果表明,熔体在制浆室内均匀过冷,大量的晶核在过冷熔体中以非自发形核的机制形成,均匀分布在熔体中,并且在过冷熔体中被保留下来,成为有效晶核,继而生长成为球状初生相。
The formation of primary phase of semi-solid slurry prepared by melt dispersion mixing method was studied. The formation mechanism of the spherical primary phase was described by the tests of the undercooling of the melt, such as the EPMA of the slurry and the stripping of the microstructure, and the melt dispersion mixing process. The results show that the melt is uniformly undercooled in the pulping chamber, a large number of nuclei are formed in a mechanism of non-spontaneous nucleation in the subcooled melt, uniformly distributed in the melt, and retained in the subcooled melt, Become effective nuclei, and then grow into spherical primary phase.