搅拌摩擦加工参数对镁合金表面改性层的影响

doi:10.13229/j.cnki.jdxbgxb.20201097

摘要/Abstract

摘要：

为改善镁合金表面的微观组织和力学性能，利用搅拌摩擦加工技术对Mg-3.4Al-0.8Zn-0.4Sn镁合金进行了表面改性。采用无针搅拌头，分别设置不同行进速度和旋转速度，通过分析热循环过程、观察表面改性层宏观形貌、进行微观组织表征以及显微硬度测量，研究了工艺参数对表面改性层的影响规律。研究结果表明：表面改性区可分为搅拌层、旋转流动层、过渡层以及热机械影响层；随着行进速度增加，热循环时间缩短且峰值温度降低，表面改性层的厚度减小，平均晶粒尺寸减小，显微硬度增大；随着旋转速度的增加，加工区域峰值温度升高，表面改性层的厚度增大，平均晶粒尺寸增大，显微硬度减小；各工艺参数下获得的改性层相比于母材晶粒明显细化，硬度有所增大。

关键词: 材料合成与加工工艺, 镁合金, 搅拌摩擦加工, 表面改性

Abstract:

In order to improve the microstructure and mechanical properties on surface of magnesium alloys， the surface modification of Mg-3.4Al-0.8Zn-0.4Sn magnesium alloy was carried out by friction stir processing. By using a pin-less tool， setting a series of travel speeds and rotation speeds， analyzing the thermal cycle process， observing the macroscopic morphology of the surface modification zone， characterizing microstructure and measuring microhardness， the influence of process parameters on the surface modification layer was studied. The results show that， the surface modification zone can be divided into four layers including stir layer， rotation flow layer， transition layer and themo-mechanical affected layer. As the travel speed increases， the time and the peak temperature of the thermal cycle， the thickness of the surface modification layer and the average grain size decrease， while the microhardness increases. By contrast， as the rotation speed increases， the peak temperature of the thermal cycle， the thickness of the surface modification layer and the average grain size increase， while the microhardness decreases. The modification layer obtained at each parameter showed significant grain refinement and microhardness increment compared to the base material.

Key words: materials synthesis and processing technology, magnesium alloy, friction stir processing, surface modification

中图分类号:

TG178

朱先勇,谢良稳,樊跃香,姜城,孙炜佳,王鹏,肖雄. 搅拌摩擦加工参数对镁合金表面改性层的影响[J]. 吉林大学学报(工学版), 2023, 53(8): 2263-2271.

Xian-yong ZHU,Liang-wen XIE,Yue-xiang FAN,Cheng JIANG,Wei-jia SUN,Peng WANG,Xiong XIAO. Effect of friction stir processing parameters on the surface modification layer of magnesium alloy[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(8): 2263-2271.

图/表 11

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