Microstructure and Properties of Mg-9.96Zn-2.10Y Alloy Solidified under Varied Super-high Pressure

Rong Xiangke; Xu Rui

doi:10.15980/j.tzzz.2017.07.025

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Microstructure and Properties of Mg-9.96Zn-2.10Y Alloy Solidified under Varied Super-high Pressure
Vol. 37, Issue 7, Pages: 781-785(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.07.025

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[1]荣祥克,徐瑞.超高压下凝固的Mg-9.96Zn-2.10Y合金的组织与性能[J].特种铸造及有色合金,2017,37(07):781-785.

Rong Xiangke, Xu Rui. Microstructure and Properties of Mg-9.96Zn-2.10Y Alloy Solidified under Varied Super-high Pressure. [J]. Special Casting & Nonferrous Alloys 37(7):781-785(2017)
[1]荣祥克,徐瑞.超高压下凝固的Mg-9.96Zn-2.10Y合金的组织与性能[J].特种铸造及有色合金,2017,37(07):781-785. DOI： 10.15980/j.tzzz.2017.07.025.

Rong Xiangke, Xu Rui. Microstructure and Properties of Mg-9.96Zn-2.10Y Alloy Solidified under Varied Super-high Pressure. [J]. Special Casting & Nonferrous Alloys 37(7):781-785(2017) DOI： 10.15980/j.tzzz.2017.07.025.

摘要

铸态的Mg-9.96Zn-2.10Y（质量分数

下同）合金在2、4、6GPa高压下进行凝固并分别对铸态、2GPa、4GPa下凝固的合金进行热压缩

然后借助OM、SEM、XRD和显微硬度计对其组织、相组成和性能进行分析测试。结果表明

随着凝固压力增大

合金组织由铸态的树枝晶转变成细小的柱状晶再到胞状晶

中间相也由分布不均匀且相互连接的网络状转变成细小、均匀的弥散状。XRD结果显示了不同凝固条件下的合金相组成不同;合金的硬度值是先增大再减小

4GPa下凝固的合金硬度达到峰值。热压缩的应力-应变曲线表明

铸态、2GPa、4GPa合金的峰值应力依次增大

但其对应的应变量却依次减小

热压缩后4GPa压力的合金组织最细小、均一。

Abstract

The Mg-9.96Zn-2.10Y（in weight

%）alloy was solidified under 2GPa

4GPa and 6GPa highpressure

and the thermal compression was conducted for the alloys solidified under as-cast

2GPa and 4GPa.Then the microstructures

phase composition and properties of the alloys prepared were analyzed by OM、SEM、XRD and hardness tester.The results indicate that microstructure of the alloy is transformed from net-like to fine columnar grain and then to cellular crystal

and intermediate phases distributed inhomogeneously with net-connect each other are transformed into fine and uniformly dispersion.XRD results show that phase constituent of alloys is varied under different solidification condition.The Vicker-hardness of the alloys is increased gradually and then decreased with the increase of the solidification pressures

and the solidification alloy at 4 GPa reaches the highest hardness.The stress-strain curves of the thermal compressed samples indicate that the peak stress is increased in the sequence of that of as-cast

2GPa

4GPa alloy

however

strain is decreased gradually.Among three alloys

alloy solidified at 4GPa exhibits desirable microstructure.