Effects of Mass Ratio of Y to Zn on Microstructures and Mechanical Properties of ZK Magnesium Alloys

Cao Fenghong; Long Siyuan

doi:10.15980/j.tzzz.2018.02.007

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Effects of Mass Ratio of Y to Zn on Microstructures and Mechanical Properties of ZK Magnesium Alloys
Vol. 38, Issue 2, Pages: 139-142(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.02.007

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[1]曹凤红,龙思远.Zn、Y质量比对半连铸ZK系镁合金组织与性能的影响[J].特种铸造及有色合金,2018,38(02):139-142.

Cao Fenghong, Long Siyuan. Effects of Mass Ratio of Y to Zn on Microstructures and Mechanical Properties of ZK Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys 38(2):139-142(2018)
[1]曹凤红,龙思远.Zn、Y质量比对半连铸ZK系镁合金组织与性能的影响[J].特种铸造及有色合金,2018,38(02):139-142. DOI： 10.15980/j.tzzz.2018.02.007.

Cao Fenghong, Long Siyuan. Effects of Mass Ratio of Y to Zn on Microstructures and Mechanical Properties of ZK Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys 38(2):139-142(2018) DOI： 10.15980/j.tzzz.2018.02.007.

摘要

以ZK60合金为基础

采用半连续铸造按Zn、Y质量比为8∶2和6∶1的比例配制ZYK820和ZYK610合金

利用金相显微镜、SEM、XRD及EDS对合金铸态组织及力学性能进行研究。结果表明

Y的加入对ZK60合金的晶粒尺寸影响不大

但能使晶界发生明显变化。当Zn、Y质量比为8∶2时

ZYK820合金中第二相主要为W-Mg

相

并有微量的I-Mg

Y相和X-Mg

ZnY相;当Zn、Y质量比为6∶1时

第二相主要为I相

其在三角结晶处呈鱼骨状或块状

同时晶界向晶内延伸

且呈网状分布;当Zn、Y质量比为6∶1时

其抗拉强度、屈服强度及伸长率分别提高了4.4%、7.6%和4%

断裂机制为以脆性断裂为主

伴有一定韧性断裂的混合断裂特征。

Abstract

Based on ZK60alloy

ZYK820and ZYK610alloys with different mass ratio of Zn/Y such as8∶2

6∶1have been prepared by semi-continuous casting.The microstructure and mechanical properties of two alloys prepared were investigated by optical microscopy

SEM

XRD and EDS.The effects of Zn/Y mass ratio on the fracture mechanism of ZK60alloy were observed by SEM.The results reveal that the addition of Y has a little effect on the grain size of ZK60alloy

however

grain boundary morphology can be changed obviously.When the mass ratio of Zn/Y is 8∶2

the second phase in the ZYK820alloy is mainly W-Mg

phase with a trace amount of I-Mg

Y phase and X-Mg

ZnY phase

while with Zn/Y mass ratio of 6∶1

the second phase is mainly I-Mg

which are formed at the triangle in form of the fishbone or parallelogram-shaped

while the grain boundaries are extended into the crystal with reticular distribution.When the mass ratio of Zn/Y is 6∶1

tensile strength

yield strength and elongation of the alloy are improved by 4.4%

7.6%and 4%

respectively.In addition

the fracture mechanism is characterized by brittle fracture mixed with a certain toughness fracture.

关键词

ZK系镁合金Zn/Y质量比显微组织力学性能

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