Effect of TiB_2 addition on microstructure of spray-formed Si-30Al composite  

TiB_2颗粒对喷射沉积Si-30Al复合材料显微组织的影响(英文)

作　　者：甘贵生[1,2] 张磊[1] 贝舒瑜[1] 卢毅[1] 杨滨[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]重庆理工大学材料科学与工程学院,重庆400050

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第10期2242-2247,共6页中国有色金属学报（英文版）

基　　金：Project(707007)supported by the Cultivation Fund of the Key Scientific and Technical Innovation,China;Project(2093040)supported by Beijing Municipal Natural Science Foundation,China

摘　　要：An in situ reaction and spray forming technique were employed in the synthesis of 2% TiB2/Si-30Al composite.The formation mechanism of TiB2 particulates was explained based on thermodynamic theory.The modification of the primary Si in the Si-30Al alloy was interpreted in the light of the knowledge of atomic diffusion.The experimental results show that adding 2% TiB2 to the Si-30Al alloy can effectively refine the primary Si.Moreover,the coarsening and growth of primary Si phase in its semi-solid state was retarded effectively due to the existence of the TiB2 particulates.结合原位反应技术和喷射沉积技术制备2%TiB2/Si-30Al铝基复合材料。应用热力学讨论TiB2颗粒的原位反应合成原理,根据原子扩散理论分析TiB2对初晶硅的改性作用。结果表明:Si-30Al中添加2%(质量分数)的TiB2能明显细化初晶硅相。在半固态二次加热过程中,TiB2颗粒能明显抑制初晶硅的粗化、长大。

关 键 词：spray forming TiB2 particulate COARSENING semi-solid state 

分 类 号：TB331[一般工业技术—材料科学与工程]