Microstructures Characterization of Melt-spun Rapidly Solidified Mg-4.8Zn-0.6 YAlloy

Meng Lingnan; Xu Chunjie

doi:10.15980/j.tzzz.2014.10.007

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Microstructures Characterization of Melt-spun Rapidly Solidified Mg-4.8Zn-0.6 YAlloy
Vol. 34, Issue 10, Pages: 1035-1038(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.10.007

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[1]孟令楠,徐春杰.单辊快速凝固Mg-4.8Zn-0.6Y合金的组织[J].特种铸造及有色合金,2014,34(10):1035-1038.

Meng Lingnan, Xu Chunjie. Microstructures Characterization of Melt-spun Rapidly Solidified Mg-4.8Zn-0.6 YAlloy. [J]. Special Casting & Nonferrous Alloys 34(10):1035-1038(2014)
[1]孟令楠,徐春杰.单辊快速凝固Mg-4.8Zn-0.6Y合金的组织[J].特种铸造及有色合金,2014,34(10):1035-1038. DOI： 10.15980/j.tzzz.2014.10.007.

Meng Lingnan, Xu Chunjie. Microstructures Characterization of Melt-spun Rapidly Solidified Mg-4.8Zn-0.6 YAlloy. [J]. Special Casting & Nonferrous Alloys 34(10):1035-1038(2014) DOI： 10.15980/j.tzzz.2014.10.007.

摘要

采用单辊快速凝固方法制备了Mg-4.8Zn-0.6Y合金薄带

利用SEM、TEM、XRD、EDX及DTA

研究了合金的显微组织、相组成、偏析及凝固特征。结果表明

快速凝固制备的Mg-4.8Zn-0.6Y合金由过饱和的α-Mg固溶体、准晶I（Mg3YZn6）和X（Mg12YZn）相组成

自由表面晶粒为1

μm的细小等轴晶。凝固过程的冷却速度为4.60×106

.04×107 K·s-1

满足准晶相析出所需的冷却条件。沿薄带厚度截面Mg、Zn和Y的分布比较均匀

仅存在少量偏析

晶内也存在微观偏析。偏析是由于从辊面到自由面凝固速度的差异及溶质传输和晶格结构造成的

其中Zn元素偏析最大

Y次之

Mg最小。

Abstract

The rapidly solidified Mg-4.8Zn-0.6Yribbons were prepared by melt-spun rapidly solidification with a single roller.The microstructures

phase constituent

micro-segregation and solidification characteristics of the alloy were investigated by SEM

TEM

XRD

EDX and DTA.The results show that the microstructure of rapidly solidified Mg-4.8Zn-0.6Yribbons consists ofα-Mg supersaturation solid solution

quasicrystals I（Mg3YZn6）and X（Mg12YZn）

and the fine equiaxed grain size in free surface reaches 1

μm.It indicates that the cooling rate of rapid solidification about 4.60×106

.04×107 K·s-1 meets the cooling conditions of quasicrystalline phase precipitation.Magnesium

zinc and yttrium are distributed uniformly along thickness cross section of the rapidly solidified ribbon

however

there exists a small amount of microsegregation in the thickness of ribbons and within the grains as well.Microsegregation is attributed to the difference from the copper substrate to the free surface of ribbons and the solidification velocity rate of solute transport and lattice structure

and for the segregation trend of three elements

Zn is the largest

and then Y

Mg.