Nucleation Mechanism of Near-Spheroidal Primary Phase in Semi-Solid Slurry Prepared by Melt Spreading and Mixing Technique

Zeng Yidan; Hao Xin; Che Guangdong; Xu Ping

doi:10.15980/j.tzzz.2014.11.011

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Nucleation Mechanism of Near-Spheroidal Primary Phase in Semi-Solid Slurry Prepared by Melt Spreading and Mixing Technique
Vol. 34, Issue 11, Pages: 1154-1158(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.11.011

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[1]曾怡丹,郝新,车广东,许萍.MAMT法制备半固态浆料中初生相的形核机理[J].特种铸造及有色合金,2014,34(11):1154-1158.

Zeng Yidan, Hao Xin, Che Guangdong, et al. Nucleation Mechanism of Near-Spheroidal Primary Phase in Semi-Solid Slurry Prepared by Melt Spreading and Mixing Technique. [J]. Special Casting & Nonferrous Alloys 34(11):1154-1158(2014)
[1]曾怡丹,郝新,车广东,许萍.MAMT法制备半固态浆料中初生相的形核机理[J].特种铸造及有色合金,2014,34(11):1154-1158. DOI： 10.15980/j.tzzz.2014.11.011.

Zeng Yidan, Hao Xin, Che Guangdong, et al. Nucleation Mechanism of Near-Spheroidal Primary Phase in Semi-Solid Slurry Prepared by Melt Spreading and Mixing Technique. [J]. Special Casting & Nonferrous Alloys 34(11):1154-1158(2014) DOI： 10.15980/j.tzzz.2014.11.011.

摘要

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。

Abstract

The nucleation behavior of primary phase in semi-solid slurry prepared by melt spreading and mixing technique（MSMT）was analyzed.By determining undercooling degree of melt prepared by MSMT

measuring the distribution elements in primary phase particles with EPMA and the experiment obtained 3Dimages by serial-sectioning technique

formation mechanism of globular primary microstructure under melt spread and mixed condition was discribed.When the melt is cooled below liquidus by processing in making-slurry chamber

heterogeneous nucleation takes place in the liquid alloy to uniformly distribute in the melt and retain in the super-cooled melt to form effective nuclei

and then it is grown into the globular phase.