Effects of Ultrasonic Treatment and Er-Ce Compound Modification on Microstructure and Mechanical Properties of Hypereutectic Mg-3.2Si Alloys

Bai Shimei; Yao Junping; Sun Zhong

doi:10.15980/j.tzzz.2019.01.025

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Effects of Ultrasonic Treatment and Er-Ce Compound Modification on Microstructure and Mechanical Properties of Hypereutectic Mg-3.2Si Alloys
Vol. 39, Issue 1, Pages: 91-94(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.01.025

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[1]柏世梅,尧军平,孙众.超声处理协同Er和Ce复合变质对Mg-3.2Si合金组织及性能的影响[J].特种铸造及有色合金,2019,39(01):91-94.

Bai Shimei, Yao Junping, Sun Zhong. Effects of Ultrasonic Treatment and Er-Ce Compound Modification on Microstructure and Mechanical Properties of Hypereutectic Mg-3.2Si Alloys. [J]. Special Casting & Nonferrous Alloys 39(1):91-94(2019)
[1]柏世梅,尧军平,孙众.超声处理协同Er和Ce复合变质对Mg-3.2Si合金组织及性能的影响[J].特种铸造及有色合金,2019,39(01):91-94. DOI： 10.15980/j.tzzz.2019.01.025.

Bai Shimei, Yao Junping, Sun Zhong. Effects of Ultrasonic Treatment and Er-Ce Compound Modification on Microstructure and Mechanical Properties of Hypereutectic Mg-3.2Si Alloys. [J]. Special Casting & Nonferrous Alloys 39(1):91-94(2019) DOI： 10.15980/j.tzzz.2019.01.025.

摘要

研究了超声处理协同稀土元素Er和Ce复合变质对过共晶Mg-3.2Si合金中组织和力学性能的影响

并探讨了其作用机理。结果表明

在过共晶Mg-3.2Si合金中

添加约0.6%（质量分数

下同）的Er时

初生Mg2Si相的尺寸由150μm减小到40μm

其形态从粗大树枝状变为不规则多面体形状;继续添加1.0%的Ce

可获得5～10μm的多面体或球状初生Mg2Si相

变质效果明显。在此基础上

超声处理可以有效改变初生Mg2Si相的形状和尺寸。当超声功率为1 200W时

可获得颗粒状的初生Mg2Si相

细化效果最佳

合金试样的抗拉强度与伸长率分别达到158MPa和4.5%。对其断口分析可知

经超声处理的合金断裂形式为解理断裂和韧窝的混合断裂形式。

Abstract

Effects of ultrasonic treatment and Er-Ce compound modification on microstructure and mechanical properties of hypereutectic Mg-3.2Si alloy were investigated

and the refining mechanism was described.The results reveal that with 0.6%（mass fraction

the same below）Er addition

the size of the primary Mg2 Si phase in the Mg-3.2Si alloy is decreased from 150μm to 40μm with strucutre transformed from bulky dendritic into irregular polyhedron shape.Then adding 1.0% Ce

polyhedron primary Mg2 Si phase with size of 5～10μm can be observed in the Mg-3.2Si alloy.With the increase of ultrasonic treatment power

the morphology

size and distribution of Mg2 Si in Mg-3.2Si alloy solidified structure can be improved obviously.With ultrasonic treatment power of1 200 W

the Mg2 Si phase in the alloy is changed into granulate structure

and its tensile strength and elongation reach 158 MPa and 4.5%

respectively.The fracture morphology of the Er-Ce compound modified Mg-3.2Si alloy after ultrasonic treated is characterized by as a mixed fracture form between cleavage fracture and dimple fracture.