摘要
采用化学镀法制备镀层分布均匀的Ni@Al_(2)O_(3)包覆粉末,以制备Ni@Al_(2)O_(3)(p)/7075体育装备用复合材料,使用X射线衍射仪、光学显微镜、扫描电镜和万能实验机等研究分析了包覆颗粒及复合材料的显微组织、硬度和力学性能。结果显示,Ni@Al_(2)O_(3)包覆粉末可有效提高增强颗粒与基体之间的润湿性,有效减少Al_(2)O_(3)颗粒的聚集现象和缺陷的产生,当Ni@Al_(2)O_(3)(p)含量为1.5%时,复合材料的微观组织细化程度最显著,平均晶粒尺寸最小,平均硬度、密度、抗拉强度和伸长率最大,过量的Ni@Al_(2)O_(3)(p)会导致Al_(2)O_(3)颗粒的团聚。1.5wt%Ni@Al_(2)O_(3)(p)/7075拉伸断口出现大量韧窝,表现为准解离断裂,力学性能提升主要是细晶强化和固溶强化的共同作用。
Ni@Al_(2)O_(3) coated powders with uniformly distributed coating prepared by electroless plating were used to prepare Ni@Al_(2)O_(3)(p)/7075 composite for sports equipment.The microstructure,hardness and mechanical properties of coated particles the composites were studied and analyzed by optical microscope,scanning electron microscope,microhardness tester and universal experimental machine.The results showed that the Ni@Al_(2)O_(3) coated powder effectively improved the wettability between the Al_(2)O_(3) particles and the matrix,inhibited the agglomeration of Al_(2)O_(3) particles and the generation of defects.When the Ni@Al_(2)O_(3)(p)content was 1.5%,the microstructure refinement degree of the composite was the most obvious,the average grain size was the smallest,the average hardness,density,tensile strength and elongation were the largest.Excessive Ni@Al_(2)O_(3)(p)led to the agglomeration of the Al_(2)O_(3) particles.The tensile fracture of 1.5wt%Ni@Al_(2)O_(3)(p)/7075 showed a large number of dimples,which showed quasi-dissociation fracture.The improvement of the mechanical properties was mainly due to the joint effect of fine grain strengthening and solid solution strengthening.
作者
赵盼
ZHAO Pan(Guangxi Normal University for Nationalities,Chongzuo 532200,Guangxi,China)
出处
《铸造》
CAS
北大核心
2022年第7期878-882,共5页
Foundry
基金
2020年度广西高等教育本科教学改革工程项目(2020JGB121)。
关键词
化学镀
包覆颗粒
7075
体育装备
力学性能
electroless plating
coated particles
7075
sports equipment
mechanical properties
