FSP对AZ31合金型材加工硬化率及力学性能的影响
Effects of FSP on Working Hardening Rate and Mechanical Properties of AZ31 Magnesium Alloy Extrusion Profile
杨晓敏 1董锋 2刘守法3
作者信息
- 1. 永城职业学院机电工程系
- 2. 西安热工研究院
- 3. 西京学院机械工程学院
- 折叠
摘要
对AZ31镁合金挤压型材实施了搅拌摩擦加工(Friction Stir Processing·FSP),利用光学显微镜和拉伸试验机研究了搅拌摩擦加工对试样加工硬化率及力学性能的影响.结果表明,AZ31镁合金经搅拌摩擦加工后,晶粒得到细化,均匀伸长率和总伸长率相近,室温伸长率达22％;拉伸应变超过0.03时,搅拌区材料的加工硬化率超过母材,此时搅拌区和母材的显微组织中均出现变形孪晶,不同的是搅拌区材料的变形孪晶整体呈带状分布,且加工硬化率也较高.
Abstract
The friction stir processing (FSP) experiment was carried out on AZ31 magnesium alloy extrusion profile.The effects of FSP on the working hardening rate and mechanical properties of the samples were investigated by means of optical microscope and sample stretching equipment.The results reveal that the grain of AZ31 magnesium alloy is refined by frictional stirring processing.The uniform elongation and the total elongation are similar (about 22％).When the tensile strain is more than 0.03,the working hardening rate of the alloy in the stirring zone is more than the base material,and the deformed twin crystals can be observed both in the stirring zone and base metal.The deformed twin crystals in the stirring zone exhibit a ribbon distribution,leading to the higher working hardening rate.
关键词
搅拌摩擦加工/加工硬化率/力学性能Key words
Friction Stir Processing/Working Hardening Rate/Mechanical Properties引用本文复制引用
基金项目
陕西省教育厅专项科研计划资助项目(15JK2172)
西京学院科研基金资助项目(XJ140228)
出版年
2017
NETL
NSTL
维普
万方数据