青岛科技大学  English 
李成栋
赞  

副教授 硕士生导师  

教师拼音名称:Lichengdong

电子邮箱:

办公地点:材料科学与工程学院229房间

性别:男

联系方式:15588619659

职称:副教授

手机版

访问量:

最后更新时间:..

Facile Synthesis of Al-20Si@Al2O3 Nanosheets Composite Powders and Its Refinement Performance on Primary Silicon in Al-20Si Alloy

关键字:AL-SI ALLOY; MECHANICAL-PROPERTIES; MICROSTRUCTURE; MELT; BEHAVIOR; PHASE; WEAR; SR

摘要:In this work, Al(OH)(3) nanosheets are synthesized in situ on the surface of an Al-20Si alloy via the water bath method, and Al-20Si@Al2O3 composites are then obtained after calcination. The growth mechanism of the Al(OH)(3) nanosheets is revealed, and a pathway is demonstrated to obtain Al-20Si@Al2O3 nanosheets with the desired structure and thickness. Furthermore, the influence of different Al-20Si@Al2O3 contents on the primary silicon phase in the Al-20Si alloy is investigated, and the mechanism of such an influence is theoretically analyzed. The mechanical properties of the modified Al-20Si alloy are tested, and the effects of the morphology and particle size of the silicon phase on the alloy properties are studied. The results show that Al-20Si@Al2O3 synthesized in situ by water bath has good dispersion in the melt. There is a lot of gamma-Al2O3 dispersed in the matrix of the alloy, and the primary silicon of the Al-20Si alloy is obviously refined. By increasing the content of the modifier, the average size of primary silicon decreases first and then increases. When 15 wt% of the modifier is added, the refinement effect of primary silicon reaches its peak, and the size of primary silicon is reduced from unmodified 86.4 mu m to 28.5 mu m. The hardness and tensile strength of 75.2 HB and 120.3 MPa are increased to 107.2 HB and 185.9 Mpa by 42% and 55%, respectively. Compared with adding gamma-Al2O3 directly, this experiment provides a simple method to synthesize the modifier, and gamma-Al2O3 can be dispersed evenly in the aluminium-silicon alloy melt more easily by in-situ generation, without ultrasonic treatment or other ways. During mass production, the cost can be better controlled and good results can be achieved at the same time.

卷号:13

期号:3

是否译文:

崂山校区 - 山东省青岛市松岭路99号   
四方校区 - 山东省青岛市郑州路53号   
中德国际合作区(中德校区) - 山东省青岛市西海岸新区团结路3698号
高密校区 - 山东省高密市杏坛西街1号   
济南校区 - 山东省济南市文化东路80号©2015 青岛科技大学    
管理员邮箱:master@qust.edu.cn