固相合成纳米级xSiC/Mg-5.5Zn-0.1Y合金组织及力学性能  

Microstructure and mechanical properties of nanoscale xSiC/Mg-5.5Zn-0.1Y alloys by solid phase synthesis

作　　者：彭二宝[1,2] 马骁 PENG Erbao;MA Xiao(School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430070,China;College of Mechanical Engineering,Henan Polytechnic Institue,Nanyang 473000,China;Education and Development Center of Machinery Industry,Beijing 100055,China)

机构地区：[1]武汉理工大学机电工程学院,武汉430070 [2]河南工业职业技术学院机械工程学院,南阳473000 [3]机械工业教育发展中心,北京100055

出　　处：《粉末冶金技术》2023年第2期149-153,共5页Powder Metallurgy Technology

基　　金：河南省科技厅科技攻关项目(142102310526);南阳市2019年科技发展计划项目(KJGG008)。

摘　　要：通过固相合成的方法制备纳米级SiC颗粒增强Mg-5.5Zn-0.1Y合金,研究了SiC颗粒质量分数对Mg-5.5Zn-0.1Y合金组织及力学性能的影响。结果表明:随着SiC颗粒质量分数的提高,SiC颗粒分布状态变得更团聚,产生了明显的钉扎作用,具有显著细化晶粒的效果。SiC颗粒附近区域产生了大量位错,为添加质量分数2.0%SiC颗粒的Mg-5.5Zn-0.1Y合金再结晶形核提供有利条件,促进晶粒细化。提高SiC颗粒质量分数,合金硬度增大,加入质量分数2.0%SiC颗粒时,合金获得了最高硬度(HV 82)。提高SiC颗粒质量分数,降低了合金裂纹数量,SiC颗粒和Mg-5.5Zn-0.1Y合金发生界面脱粘现象,形成裂纹源并引起断裂。提高SiC颗粒质量分数能够使合金获得更高的强度与伸长率。The Mg-5.5Zn-0.1Y alloys reinforced by the nanoscale SiC particles were prepared by solid phase synthesis,and the effect of SiC particle mass fraction on the microstructure and mechanical properties of Mg-5.5Zn-0.1Y alloys was investigated.The results show that,the distribution of SiC particles becomes more uniform with the increase of SiC particle mass fraction,which results in the significant napping and grain refinement.A large number of dislocations occur in the vicinity of SiC particles in the Mg-5.5Zn-0.1Y alloys doped by SiC particles in the mass fraction of 2.0%,which provide the favorable conditions for the recrystallization nucleation and promote the grain refinement.Increasing the SiC particle mass fraction can increase the hardness of alloys.When the SiC particle mass fraction is 2.0%,the Mg-5.5Zn-0.1Y alloys achieve the maximum hardness as HV 82.When the SiC particle mass fraction is increased,the number of cracks is reduced,the interface between the SiC particles and Mg-5.5Zn-0.1Y alloys is de-bonded,the crack source is formed,and the fracture is caused.The higher SiC particle mass fraction can make the alloys obtain the higher strength and elongation.

关 键 词：固相合成 镁合金 颗粒增强 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]