Effects of Gd on Microstructure and Mechanical Properties of Al-5Mg-2Si-Mn Alloy

Wang Keyan; Wu Xiaofeng; Gao Xinyu; Zhao Rongda; Wu Fufa

doi:10.15980/j.tzzz.2018.11.022

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Effects of Gd on Microstructure and Mechanical Properties of Al-5Mg-2Si-Mn Alloy
Vol. 38, Issue 11, Pages: 1244-1247(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.11.022

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[1]王克研,武晓峰,高欣宇,赵荣达,伍复发.Gd对Al-5Mg-2Si-Mn合金组织与力学性能的影响[J].特种铸造及有色合金,2018,38(11):1244-1247.

Wang Keyan, Wu Xiaofeng, Gao Xinyu, et al. Effects of Gd on Microstructure and Mechanical Properties of Al-5Mg-2Si-Mn Alloy. [J]. Special Casting & Nonferrous Alloys 38(11):1244-1247(2018)
[1]王克研,武晓峰,高欣宇,赵荣达,伍复发.Gd对Al-5Mg-2Si-Mn合金组织与力学性能的影响[J].特种铸造及有色合金,2018,38(11):1244-1247. DOI： 10.15980/j.tzzz.2018.11.022.

Wang Keyan, Wu Xiaofeng, Gao Xinyu, et al. Effects of Gd on Microstructure and Mechanical Properties of Al-5Mg-2Si-Mn Alloy. [J]. Special Casting & Nonferrous Alloys 38(11):1244-1247(2018) DOI： 10.15980/j.tzzz.2018.11.022.

摘要

研究了Gd对Al-5Mg-2Si-Mn合金铸态组织、相结构、力学性能和断口形貌的影响。研究发现

Gd对Al-5Mg-2SiMn合金中的初生α-Al及共晶Mg

Si相具有很强的变质和细化作用

当Gd含量为0.4%时

变质和细化效果最为明显

二次枝晶间距由未变质处理的28.23μm减小到12.96μm

共晶Mg

Si尺寸从9.38μm减少到5.07μm。且合金的力学性能显著提高

抗拉强度、伸长率和硬度（HRB）分别由未细化变质的235MPa、3.9%和33.21增加至328MPa、6.0%和43.33

合金的断裂方式由脆性断裂转变为韧性断裂。

Abstract

Effects of Gd on the microstructure

phase structure

mechanical properties and fracture morphology of Al-5Mg-2Si-Mn alloy were analyzed.The results reveal that the Gd element presents a strong modification and refinement effect on the primaryα-Al phase and eutectic Mg

Si phase

and the effect of modification and refinement is desirable when Gd content is 0.4%.The distance between secondary dendrites are decreased from 28.23μm un-modified ones to 12.96μm

and eutectic Mg

Si size is decreased from 9.38μm to 5.07μm.The tensile strength

elongation and hardness of the alloy treated by 0.4% Gd are increased from 235MPa

3.9%and 33.21HRB to 328MPa

6.0% and 43.33HRB

respectively

and the fracture mode is changed from brittleness to dimple structure.