Effect of Solid Solution and Aging Treatments on the Microstructure of Mg-2Er-1Zn-0. 18Zr Alloy

Li Caihong; Chen Leping; Yin Jian

doi:10.15980/j.tzzz.2014.07.023

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Effect of Solid Solution and Aging Treatments on the Microstructure of Mg-2Er-1Zn-0. 18Zr Alloy
Vol. 34, Issue 7, Pages: 747-751(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.07.023

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[1]李彩虹,陈乐平,尹健.固溶和时效对Mg-2Er-1Zn-0.18Zr合金组织的影响[J].特种铸造及有色合金,2014,34(07):747-751.

Li Caihong, Chen Leping, Yin Jian. Effect of Solid Solution and Aging Treatments on the Microstructure of Mg-2Er-1Zn-0. 18Zr Alloy. [J]. Special Casting & Nonferrous Alloys 34(7):747-751(2014)
[1]李彩虹,陈乐平,尹健.固溶和时效对Mg-2Er-1Zn-0.18Zr合金组织的影响[J].特种铸造及有色合金,2014,34(07):747-751. DOI： 10.15980/j.tzzz.2014.07.023.

Li Caihong, Chen Leping, Yin Jian. Effect of Solid Solution and Aging Treatments on the Microstructure of Mg-2Er-1Zn-0. 18Zr Alloy. [J]. Special Casting & Nonferrous Alloys 34(7):747-751(2014) DOI： 10.15980/j.tzzz.2014.07.023.

摘要

采用光学显微镜、X射线衍射、扫描电镜以及硬度试验等手段

研究了固溶和时效处理对Mg-2Er-1Zn-0.18Zr合金组织的影响。结果表明

Mg-2Er-1Zn-0.18Zr铸态合金主要由α-Mg相和X-Mg12ErZn相组成;合金的最佳固溶工艺为540℃×32 h

在该工艺条件下X-Mg12ErZn完全溶入α-Mg基体中

析出大量的W-Mg3Er2Zn3相

且晶粒没有明显长大;随后合金经过180℃的时效处理

与固溶态合金相比

Mg-2Er-1Zn-0.18Zr时效态合金组织变化不明显

仍由α-Mg相和W-Mg3Er2Zn3相组成

合金的显微硬度值变化不大。

Abstract

Effects of solid solution and aging treatments on the microstructure of Mg-2Er-1Zn-0. 18Zr（ atom. %）were investigated by optical microscope（ OM）

XRD（ X-ray diffraction）

SEM（ scanning electron microscopy）

EDS（ energy dispersedly spectrometer） and microhardness testing. The results show that the microstructure of as-cast Mg-2Er-1Zn-0. 18Zr alloy is composed of α-Mg phase and X-Mg12ErZn phase. After solid solution treatment at 540 ℃ for 32 h

the X-Mg12ErZn phase is completely dissolved into the matrix phase with precipitation of W-Mg3Er2Zn3phase

however

the coarseness of grain size is absent. Compared with that of solid solution alloy

the obvious change of microstructure and micro-hardness of the alloy after aged treatment at 180 ℃ can not be observed

which is composed of α-Mg phase and W-Mg3Er2Zn3phase also.