Influence of Slow Cooling Conditions on Grain Size and Distribution of β-phase in Mg-Al Alloys

Zhang Zhongyi; Yang Jiandong; Zhang Sha; Wang Wuxiao

doi:10.15980/j.tzzz.2012.08.016

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Influence of Slow Cooling Conditions on Grain Size and Distribution of β-phase in Mg-Al Alloys
Vol. 32, Issue 8, Pages: 703-706(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.08.016

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[1]张忠义,杨建东,张莎,王武孝.低冷速对Mg-Al合金晶粒尺寸及β相的影响[J].特种铸造及有色合金,2012,32(08):703-706.

Zhang Zhongyi, Yang Jiandong, Zhang Sha, et al. Influence of Slow Cooling Conditions on Grain Size and Distribution of β-phase in Mg-Al Alloys. [J]. Special Casting & Nonferrous Alloys 32(8):703-706(2012)
[1]张忠义,杨建东,张莎,王武孝.低冷速对Mg-Al合金晶粒尺寸及β相的影响[J].特种铸造及有色合金,2012,32(08):703-706. DOI： 10.15980/j.tzzz.2012.08.016.

Zhang Zhongyi, Yang Jiandong, Zhang Sha, et al. Influence of Slow Cooling Conditions on Grain Size and Distribution of β-phase in Mg-Al Alloys. [J]. Special Casting & Nonferrous Alloys 32(8):703-706(2012) DOI： 10.15980/j.tzzz.2012.08.016.

摘要

在Ar保护条件下获得冷却速度为1、2、3、4和5℃/min的Mg-6Al和Mg-10Al合金

利用光学显微镜、扫描电镜、能谱分析和Imagetool软件研究慢冷对Mg-6Al和Mg-10Al合金晶粒尺寸以及β相分布特征与数量的影响。结果表明

Mg-6Al和Mg-10Al合金凝固组织由α-Mg相、点状和层片状析出β-Mg17Al12相以及棒状（α+β）共晶组成。随着冷速从5℃/min减小到1℃/min

Mg-6Al与Mg-10Al合金组织中α-Mg晶粒尺寸分别由195.7、180.4μm增至318.7、225.1μm

与此同时β-Mg17Al12相的数量分别由24.56%、45.50%降至18.36%、38.59%。

Abstract

Mg-6Al and Mg-10Al alloys were prepared under the condition of Ar protection at the cooling rate of 1 ℃/min

2 ℃/min

3 ℃/min

4 ℃/min and 5 ℃/min.Influences of slow cooling conditions on grain size and distribution and quantity of β-phase in Mg-6Al and in Mg-10Al alloys were investigated by OM（optical microscope）

SEM（scanning electron microscope）

EDS（energy dispersive spectrometer） and Image tool.The results show that

solidification microstructure of Mg-6Al and Mg-10Al alloys is composed of α-Mg 、β-Mg17Al12 phases with pit-shape or lamellar-shape and rod-shaped（α+β） eutectic structure.With the cooling rate decreasing from 5 ℃/min to 1 ℃/min

the grain size of α-Mg in Mg-6Al and in Mg-10Al alloys is increased from 195.7μm、180.4 μm to 318.7 μm、225.1 μm

respectively

and the quantity of β-Mg17Al12 phase is decreased from 24.56%、45.50% to 18.36% and 38.59%

respectively.