CrCoNi/AZ31镁基复合材料制备与表征综合实验  

Comprehensive experiment on preparation and characterization of CrCoNi/AZ31 magnesium-based composite materials

作　　者：周海萍 阮奥琪 张弘斌[1] 孙家文 陈圣超 ZHOU Haiping;RUAN Aoqi;ZHANG Hongbin;SUN Jiawen;CHEN Shengchao(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266590

出　　处：《实验技术与管理》2024年第7期186-191,共6页Experimental Technology and Management

基　　金：山东省自然科学基金面上项目(ZR2023ME227)。

摘　　要：采用机械球磨与放电等离子烧结相结合的方法,制备了CrCoNi颗粒质量分数分别为2.5 wt%、5 wt%和10 wt%的CrCoNi/AZ31复合材料试样。采用扫描电子显微镜(SEM)对复合材料进行表征,并对复合材料的纵截面进行X射线衍射仪(XRD)分析。还对CoCrNi/AZ31复合材料进行了力学性能测试,研究了复合材料的硬度,测试了不同温度和应变速率下的屈服极限。该实验涉及粉末冶金、材料表征和力学性能等方面知识,综合性强,有助于培养学生的科研思维及综合运用所学知识的能力。[Objective]To promote the widespread adoption of magnesium-based composite materials in lightweight structural applications,it is essential to develop and apply appropriate plastic forming processes to enhance their processing performance.Particle reinforcement and grain refinement are effective approaches to strengthening magnesium alloys.Metal particle reinforcement exhibits excellent mechanical properties and significantly strengthens magnesium alloys.[Methods]In this experiment,different mass fractions of CrCoNi particles were mechanically ball-milled with AZ31 magnesium alloy.The milled powders were subsequently sintered using spark plasma sintering technology to obtain composite specimens with CrCoNi mass fractions of 2.5wt%,5wt%,and 10wt%.The sintered specimens were processed and characterized using X-ray diffraction(XRD)analysis and scanning electron microscopy(SEM)to investigate the microstructure and degree of grain refinement of the powder metallurgy-prepared CrCoNi/AZ31 magnesium-based composite materials.Mechanical performance testing was conducted on the CoCrNi/AZ31 composite to study the effect of CrCoNi particles on the hardness of the composite material.Subsequently,the samples underwent isothermal compression tests at temperatures of 250℃,300℃,350℃,and 400℃,and strain rates of 0.001 s−1,0.01 s−1,0.1 s−1,and 1 s−1 to analyze the influence of temperature and strain rate on CrCoNi/AZ31.[Results]The addition of CrCoNi particles leads to grain size refinement in the composite material,with the alloy’s grain size decreasing as the content of CrCoNi particles increases.Owing to the high hardness of CrCoNi particles themselves and the grain refinement effect,the hardness of the composite material is significantly enhanced.Calculations using the Williamson–Hall method revealed that the variation in XRD diffraction peak width of the composite material with added CrCoNi particles is independent of lattice microstrain but solely dependent on material grain size.SEM analysis indicated the

关 键 词：粉末冶金 CrCoNi/AZ31 力学性能 压缩实验 

分 类 号：TG142.75[一般工业技术—材料科学与工程]