Effect of second-phase particle size and presence of vibration on AZ91/SiC surface composite layer produced by FSP  

第二相粒径和振动对FSP制备AZ91/SiC表面复合层的影响

作　　者：Behrouz BAGHERI Mahmoud ABBASI Amin ABDOLLAHZADEH Seyyed Ehsan MIRSALEHI 

机构地区：[1]Department of Mining and Metallurgy,Amirkabir University of Technology,Tehran,Iran [2]Faculty of Engineering,University of Kashan,Kashan,Iran [3]Department of Materials Science and Engineering,Sharif University of Technology,Tehran,Iran [4]Institute of Materials Engineering and Advanced Processes,Department of Mining and Metallurgy,Amirkabir University of Technology,Tehran,Iran

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第4期905-916,共12页中国有色金属学报（英文版）

基　　金：Amirkabir University of Technology(AUT);Sharif University of Technology;National Elites Foundation of Iran for their support during this research.

摘　　要：An improved method of friction stir processing(FSP)was introduced for the processing of AZ91 magnesium alloy specimens.This novel process was called“friction stir vibration processing(FSVP)”.FSP and FSVP were utilized to develop surface composites on the studied alloy while SiC nanoparticles were applied as second-phase particles.The effect of reinforcing SiC particles with different sizes(30 and 300 nm)on different characteristics of the composite surface was studied.The results indicated that the microstructure was refined and mechanical properties such as hardness,ductility,and strength were enhanced as FSVP was applied.Furthermore,it was concluded that the effect of reinforcing particles with a size of 30 nm on the microstructure and mechanical properties of the surface composite was more obvious than that of particles with a size of 300 nm.It was also found that mechanical properties and microstructure of FSV-processed specimens were improved as vibration frequency increased.The hardness value in the stir zone was about 157 MPa for the FSV-processed specimen at a vibration frequency of 50 Hz,while this value was around 116 MPa for the FSV-processed specimen at a vibration frequency of 25 Hz.采用改进的搅拌摩擦加工方法(FSP)加工AZ91镁合金试样。这种新方法称为“振动搅拌摩擦加工方法(FSVP)”。SiC纳米颗粒作为第二相粒子,利用FSP和FSVP制备合金的表面复合层,研究不同粒径(30 nm和300 nm)的SiC强化颗粒对复合材料表面不同性能的影响。结果表明,采用FSVP工艺能细化材料的显微组织,提高材料的硬度、延展性和强度等力学性能。粒径为30 nm的增强颗粒对复合材料显微组织和力学性能的影响大于粒径为300 nm的增强颗粒。振动频率越高,FSV试样的力学性能和显微组织越好;当FSV振动频率为50和25 Hz时,搅拌区硬度值分别约为157和116 MPa。

关 键 词：friction stir processing VIBRATION SiC nano-particles particle size mechanical properties microstructure residual stress 

分 类 号：TB33[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属表面处理]