Effects of Ti Content on Microstructure and Mechanical Properties of As-cast AM60 Magnesium Alloy

He Feng; Li Jianping; Yang Zhong; Guo Yongchun

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Effects of Ti Content on Microstructure and Mechanical Properties of As-cast AM60 Magnesium Alloy
Issue 3, Pages: 227-229(2008)
Published： 2008 ，
DOI：

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[1]贺峰,李建平,杨忠,郭永春.铸态AM60-Ti镁合金的显微组织与力学性能[J].特种铸造及有色合金,2008(03):227-229+163.

He Feng, Li Jianping, Yang Zhong, et al. Effects of Ti Content on Microstructure and Mechanical Properties of As-cast AM60 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys (3):227-229(2008)
[1]贺峰,李建平,杨忠,郭永春.铸态AM60-Ti镁合金的显微组织与力学性能[J].特种铸造及有色合金,2008(03):227-229+163. DOI：

He Feng, Li Jianping, Yang Zhong, et al. Effects of Ti Content on Microstructure and Mechanical Properties of As-cast AM60 Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys (3):227-229(2008) DOI：

摘要

用光学显微镜、X射线衍射和扫描电镜等手段研究了AM60-xTi合金（x=0

0.2

0.4

0.8）的铸态显微组织

并测定了各试验合金的室温力学性能。试验结果表明

加入少量的Ti可显著细化AM60合金的铸态组织。Ti含量为0.2%时

晶粒细化效果最显著

第二相颗粒细小

分布均匀;AM60合金中的半网状沿晶界分布的β-Mg17Al12相变为颗粒状

并形成弥散分布的颗粒状TiAl3相

合金的抗拉强度和伸长率均达到最高。Ti含量大于0.2%时

Mg17Al12和TiAl3相的尺寸又增大

抗拉强度及伸长率随Ti含量的增加而降低

但均高于AM60合金。Ti加入AM60合金中后

细化合金的晶粒、β相

Ti和Al形成的金属间化合物TiAl分布于基体和第二相中

起到弥散强化作用

从而提高该合金的力学性能。

Abstract

As-cast microstructure of AM60 magnesium alloy with different Ti content was observed by OM（optical microscope）

XRD（X-ray diffraction meter）and SEM（scanning electron microscope）and ambient tensile strength of the alloy was measured.The results reveal that the minor Ti addition can remarkably refine the as-cast microstructure of AM60 magnesium alloy.The desirable refinement effect with uniformly distributed fine second phase can be observed with 0.2% Ti addition

in which the semi-continuous β-Mg17Al12 distributed along grain boundary was converted into particle and dispersively distributed TiAl3 particle can be created in α-Mg phase

obtaining the highest tensile strength and elongation.When Ti addition is more than 0.2%

the tensile strength and elongation of the alloy are decreased with increasing in Ti addition as a result of the coarsenization of β-Mg17Al12 and α-Mg phase

and are superior to those of AM60 magnesium without Ti.The improvement of mechanical properties of AM60 magnesium alloy is attributed to Ti addition refining grain size and β-Mg17Al12 phase in the alloy as well as formed TiAl3 phase distributed into the matrix and secondary phase to strengthen the alloy.