搅拌摩擦加工MB8镁合金的组织与力学性能分析

王赛香; 张大童

轻有色合金 | 浏览量 : 0 下载量: 299 CSCD: 5

导出
分享
收藏
专辑

搅拌摩擦加工MB8镁合金的组织与力学性能分析
Microstructure and Mechanical Properties of Frictional Stirring Processed（FSP）MB8 Magnesium Alloy
2011年31卷第1期页码：83-86
纸质出版日期： 2011 ，
DOI：

扫描看全文

[1]王赛香,张大童.搅拌摩擦加工MB8镁合金的组织与力学性能分析[J].特种铸造及有色合金,2011,31(01):83-86+107.

Wang Saixiang, Zhang Datong. Microstructure and Mechanical Properties of Frictional Stirring Processed（FSP）MB8 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2011,31(1):83-86.
[1]王赛香,张大童.搅拌摩擦加工MB8镁合金的组织与力学性能分析[J].特种铸造及有色合金,2011,31(01):83-86+107. DOI：

Wang Saixiang, Zhang Datong. Microstructure and Mechanical Properties of Frictional Stirring Processed（FSP）MB8 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2011,31(1):83-86. DOI：

摘要

研究了MB8（Mg-1.5Mn-0.3Ce）合金在FSP不同工艺参数条件下的组织和力学性能。试验在加工速度恒定为60mm/min

旋转速度分别为800、1200和1800r/min的条件下进行。结果表明

经FSP加工

原始轧制态MB8镁合金的粗大不均匀组织受到搅拌头的剧烈搅拌作用而破碎、分散

并发生动态再结晶

获得细小、均匀的等轴晶粒。在转速为800r/min时

搅拌区的平均晶粒尺寸由原始轧制态的16.5μm细化至6μm。常温拉伸试验结果表明

MB8镁合金经FSP加工后抗拉强度大幅下降

但伸长率显著增大

在1200r/min时伸长率达57%

是原始材料伸长率的160%。此外

采用SEM观察拉伸试样断口

分析了MB8镁合金的断裂机制。

Abstract

Microstructure and mechanical properties of FSP MB8（Mg-1.5Mn-0.3Ce）magnesium alloy were investigated under different processing parameters.Experiments adopted constant welding speed of 60 mm/min with rotation speed of 800

1200 and 1800 r/min.The results reveal that original coarse rolled MB8 is refined to be equixed and uniform grains after FSP as a result of severe stirring of the pin and occurrence of dynamic recrystallization in the SZs（stirring zones）.Average grain size in the SZs is greatly refined from 16.5μm to 6μm with rotation speed of 800 r/min.Ambient testing results show that the tensile strength is distinctly decreased with the great increase of elongation after FSP.Elongation of the alloy after FSP with 1200r/min reaches up to 57%

which is 160% of initial elongation.Tensile fracture morphology of the alloy was observed by SEM（scanning electron microscope）

and fracture mechanism was analyzed.