超声外场对SiC_p/7085复合材料颗粒分布与硬度的影响  

Effect of ultrasonic field on particle distribution and hardness of SiC_p/7085 composites

作　　者：王坤[1] 蒋日鹏 张立华[1] 李瑞卿 李晓谦[1] WANG Kun;JIANG Ripeng;ZHANG Lihua;LI Ruiqing;LI Xiaoqian(School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;Light Alloy Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]中南大学轻合金研究院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2018年第3期529-535,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金面上项目(51475840);湖南省自然科学基金青年基金资助项目(2017JJ3391)~~

摘　　要：采用半固态机械搅拌与超声施振的方法制备SiC_p/7085复合材料,研究超声施振时间与超声功率对复合材料颗粒分布与布氏硬度的影响。研究结果表明:机械搅拌可实现Si C颗粒与基体的初步混合,但在搅拌过程中易形成颗粒团聚、气体夹杂等缺陷;超声施振后能够有效打散微观颗粒团聚,减少气孔夹杂等缺陷;在本实验条件下,最优超声作用时间为10 min,功率为1 k W;复合材料的布氏硬度变化规律与显微组织呈现一致性,在超声时长为10 min、功率为1 k W工况下,其硬度达到最大值131.7 N/mm2,较未施加超声时增加25.7%。SiCp/7085 composite was prepared by semi-solid mixture and ultrasound vibrations method,and the influence of ultrasonic vibration time and power on microstructure and Brinell hardness(HBS)of the composites was studied.The results show that mechanical stirring can realize primary mix of the SiC particles and the matrix,but it is easy to form agglomeration and gas inclusions during the mixing process.Ultrasonic vibration can effectively break up the particle micro-agglomeration,improve defects such as porosity and inclusion,and the optimized time and power in this experimental condition are 10 min and 1 kW,respectively.It renders consistency between hardness and microstructure of the composites.Under work condition of 10 min and 1 kW,the HBS reaches the maximum value 131.7 N/mm2,which is 25.7%higher than that without ultrasonic field.

关 键 词：超声外场 SICP 7085复合材料 颗粒团聚 布氏硬度 

分 类 号：TG148[一般工业技术—材料科学与工程] TB559[金属学及工艺—金属材料]