搅拌摩擦修复铸造镁合金缺陷及力学性能分析
Friction Stir Repair of Cast Magnesium Alloy Defects and Mechanical Properties Analysis
戴启雷 1金雷 1方舟 1孟开仁1
作者信息
- 1. 华纬科技股份有限公司,浙江 诸暨 311800
- 折叠
摘要
采用搅拌摩擦加工(FSP)对铸造镁合金AZ91D内部缺陷进行了修复,采用光学显微镜(OM)、扫描电镜(SEM)及拉伸试验对修复前后的铸造镁合金组织和力学性能进行了分析.结果表明:采用优化的FSP参数可以完全消除铸造镁合金中的气孔.修复区域的显微组织和力学性能与修复前明显不同.修复区显微组织由5～15 μm的等轴晶粒组成.搅拌区的显微硬度比铸态金属的提高了10%～15%.与铸造母材相比,FSP样品的拉伸强度高出80%,伸长率比基材增加约1.8 倍.
Abstract
The internal defects of AZ91D cast magnesium alloy were repaired by friction stir processing(FSP).Optical microscope(OM),scanning electron microscope(SEM)and tensile test were used to analyze the microstructure and mechanical properties of cast magnesium alloy before and after repair.The results show that the porosities in the cast magnesium alloy can be fully eliminated by the optimized FSP parameters.The microstructure and mechanical properties of repaired regions are obviously different from those before repair.The microstructure of repaired zones is composed of isoaxial grains ranging from 5 to 15 μm.The microhardness of the stirred zone is 10%-15%higher than that of the as-cast metal.The tensile strength of the FSP sample is 80%higher that of the base material,and the elongation is about 1.8 times higher than that of the base material.
关键词
搅拌摩擦加工/镁合金/组织和性能/气孔Key words
friction stir processing/microstructure and property/magnesium alloy/porosity引用本文复制引用
出版年
2024
NETL
NSTL
万方数据