摘要
采用混合盐原位反应方法制备了不同TiB_2含量的TiB_2/Al-7Si复合材料,研究了TiB_2含量和Mg含量对复合材料冲击性能的影响。随TiB_2或Mg含量的增加,复合材料中的α-Al相和共晶Si细化,但冲击性能均呈下降趋势。未添加TiB_2和Mg时,Al-7Si合金的冲击韧度最高,约为14.2J/cm^2,加入5%的TiB_2后,冲击韧度降低至12.6J/cm^2,再加入1.5%和3%的Mg后,冲击韧度进一步降低至10.9和10.4J/cm^2。5TiB_2/Al-7Si复合材料断口形貌主要呈韧窝和准解理断裂,具有混合型断口特征。
In-situ 5TiB2/Al-7Si composites were fabricated by mixed salt reaction in Al-7Si melt.The effects of TiB2and Mg contents on the impact properties of TiB2/Al-7Si composites were investigated.As the addition of TiB2and Mg element,theα-Al and eutectic Si phases in the composites can be refined,however its impact properties can be weakened.The Al-7Si alloy exhibits the satisfied impact toughness among these composites,and it is about of 14.2J/cm^2.With the addition of 5%TiB2,the impact toughness of the composites is further reduced to 12.6J/cm^2.When the 1.5%or 3%Mg element were added into the 5TiB2/Al-7Si composites,the impact toughness of the composites is reduced to 10.9and 10.4J/cm^2,respectively.The fracture morphology of 5TiB2/Al-7Si composites is mainly characterized by dimple and quasi-cleavage of a mixed fracture.
作者
任波
赵瑞锋
刘忠侠
刘扭参
张红松
Ren Bo1, Zhao Ruifeng2,3, Liu Zhongxia3, Liu Niucan2, Zhang Hongsong1(1. School of Mechanical Engineering, Henan Institute of Engineering; 2.School of Science, Henan Institute of Engineering; 3.Key Laboratory of Materials Physics of the Ministry of Education, Zhengzhou Universit)
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2018年第9期1003-1007,共5页
Special Casting & Nonferrous Alloys
