Effect of RE,Yttrium on Morphology of Primary Mg2<sub>S</sub>i Phases in Mg<sub>2</sub>Si /AZ91D Composites

Zhang Aisheng; Zhang Yang

doi:10.15980/j.tzzz.2012.08.013

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Effect of RE,Yttrium on Morphology of Primary Mg2_Si Phases in Mg₂Si /AZ91D Composites
Vol. 32, Issue 8, Pages: 690-693(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.08.013

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[1]章爱生,张旸.稀土对Mg_2Si/AZ91D复合材料中Mg_2Si相的影响[J].特种铸造及有色合金,2012,32(08):690-693.

Zhang Aisheng, Zhang Yang. Effect of RE,Yttrium on Morphology of Primary Mg2_Si Phases in Mg₂Si /AZ91D Composites. [J]. Special Casting & Nonferrous Alloys 32(8):690-693(2012)
[1]章爱生,张旸.稀土对Mg_2Si/AZ91D复合材料中Mg_2Si相的影响[J].特种铸造及有色合金,2012,32(08):690-693. DOI： 10.15980/j.tzzz.2012.08.013.

Zhang Aisheng, Zhang Yang. Effect of RE,Yttrium on Morphology of Primary Mg2_Si Phases in Mg₂Si /AZ91D Composites. [J]. Special Casting & Nonferrous Alloys 32(8):690-693(2012) DOI： 10.15980/j.tzzz.2012.08.013.

摘要

研究了不同含量的富La混合轻稀土（RE）和钇（Y）对Mg2Si/AZ91D复合材料中初生Mg2Si相形貌的影响。结果表明

混合轻稀土RE和Y对Mg2Si/AZ91D复合材料中的初生Mg2Si相均有明显的细化变质效果

但Y对初生Mg2Si相的细化变质效果优于等量混合轻稀土。合金液经0.8%的混合轻稀土RE或Y变质后

初生Mg2Si相由粗大的树枝状转变为细块状或颗粒状;当RE或Y加入量达到1.2%时

均出现过变质现象

初生Mg2Si相再次明显粗化。其变质机理主要与RE、Y和它们的化合物富集于Mg2Si相生长表面

从而抑制其生长有关。

Abstract

Effects of different contents of RE（rich La） or Yttrium on morphologies of primary Mg2Si phases in Mg2Si/AZ91D composites were investigated.The results show that RE and Yttrium can all effectively refine the primary Mg2Si phases in Mg2Si/AZ91D composites

and the modification effect of Yttrium is superior to that of RE.Morphologies of the primary Mg2Si phases are changed from coarse dendrites to fine polygonal particles with 0.8% RE or Yttrium addition.Over-modification of the primary Mg2Si phases can be observed with RE or Yttrium addition to 1.2%

and primary Mg2Si phase is coarsened again.Modification mechanism is attributed to the enrichment of RE

Yttrium and their intermetallic compounds on the growth faces of the primary Mg2Si crystals restraining the growth of primary phase.

关键词

Mg2Si/AZ91D复合材料初生Mg2Si相细化变质混合轻稀土（RE）和Y

Keywords

Mg2Si/AZ91D CompositesPrimary Mg2Si PhaseModificationRE or Yttrium

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Effects of Pulsed Magnetic Field and Casting Process on Mg₂Si Phase in Mg₂Si/Al Composites

Effect of RE,Yttrium on Morphology of Primary Mg2Si Phases in Mg2Si /AZ91D Composites

DOI： 10.15980/j.tzzz.2012.08.013

摘要

Abstract

关键词

Keywords

references

Effect of RE,Yttrium on Morphology of Primary Mg2_Si Phases in Mg₂Si /AZ91D Composites