摘要
通过真空热压工艺制备了单一纳米及纳/微米SiC混合颗粒增强的Al-Si复合材料,研究了SiC颗粒的加入对复合材料的组织、致密度及硬度的影响。结果表明:纳米SiCp/Al-Si复合材料与基体合金相比晶粒细化,随着纳米SiC含量的增加,纳米SiCp/Al-Si复合材料的硬度、致密度都是先增大后减小,当纳米SiC含量为3%时硬度取得最大值64.4HV,较基体材料提高了28.8%;用扫描电镜对纳/微米SiCp/Al-Si复合材料的组织、形貌进行观察,发现微米SiC颗粒与基体合金结合紧密,界面无明显反应物生成。纳米SiC含量为3%时,随着微米SiC含量的增加,纳/微米SiCp/Al-Si复合材料的硬度、致密度都是先增大后减小,当增强颗粒含量为3%SiCnm+15%SiCμm时硬度取得最大值76.7HV,较基体材料提高了53.4%。
In this work,Al-Sicomposites reinforced by single nano and hybrid nano-micro SiC particles have been fabricated by vacuum hot pressing,and then the effects of addition amount of SiC particles on the microstructure,density and hardness were investigated. The results reveal that the Al-Simatrix grains are refined by the SiC nanoparticles. As the addition amount of SiC nano-particles increasing,the density and hardness increases first then decreases. The hardness of the composites with 3. 0% SiC nano-particles reaches the maximum value of 64. 4 HV,and which is improved by 28. 8% compared with Al-Simatrix alloy. The morphology of the nano-micro SiC particles reinforced composites were observed by SEM（ scanning electron microscope）,it is found that SiC micro-particles and the matrix are linked closely,no significant reactant generated in the interface. While the amount of SiC nanoparticles is 3. 0%,as the addition amount of SiC micro-particles increasing,the density and hardness increase first then decreases. The hardness of the composites with（ 3. 0% nm ＋ 15. 0% um） hybrid nano-micro SiC particles reaches the maximum value of 76. 7 HV,and which is improved by 53. 4% compared with Al-Simatrix alloy.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2016年第1期11-15,共5页
Powder Metallurgy Technology
关键词
真空热压烧结
纳/微米混合颗粒
铝基复合材料
硬度
致密度
Vacuum hot pressing sintering
nano-micro mixed particles
aluminum matrix composite
hardness
density
