摘要
采用混合盐反应法制备(TiB2+Al3Ti)/Al-4.5Cu原位复合材料,测试其室温力学性能,并通过OPM、TEM等观察其微观组织.结果表明:增强相TiB2和Al3Ti弥散分布在α-Al中,颗粒的平均尺寸约100～300nm TiB2呈小圆片状,α-Al的(200)晶面与TiB2的(101)晶面存在局部共格关系,并有[011]Al∥[010]TiB2;Al3Ti呈棒状,几乎与α-Al完全共格,并有[121]Al∥[010]Al3Ti.(TiB2+Al3Ti)/Al-4.5Cu原位复合材料强韧化的主要机制为细晶强化和弥散强化.
In-situ composites of （TiB2＋Al3Ti）/Al-4.5Cu were fabricated via mixed salts reaction in Al-4.5Cu alloy. The composites＇ mechanical properties at room temperature were tested and the microstructure were observed with the aid of OPM and TEM. The results show that of TiB2 and AlaTi are dispersed in the matrix of α-Al and the grain size of the reinforcing phases averages 100-300 nm. TiB2 grains are characterized by lit＇tie round sheet,partial coherent interfaces relationship exits between crystal plane（200）of a-Al and （101） of TiB2; AlaTi grains are like rods. There is nearly complete coherent interfaces relationship between a-Al and Al3Ti. The main mechanism for the elevated mechanical properties of the in-situ composites is fine-grain reinforcing and dispersion reinforcing.
出处
《铸造技术》
EI
CAS
北大核心
2005年第10期887-891,共5页
Foundry Technology
关键词
原位复合材料
相结构
力学性能
In-situ composite
Phase structure
Mechanical properties
