引燃模式对燃烧合成Al-Ti-C中间合金的组织细化性能影响  

The Different Igniting mode Have Influenced the Microstructure and Grain Refining Performance of Al-Ti-C Master Alloy

作　　者：郑丽[1] 牛永江[1] 李琴兰[1] 

机构地区：[1]天水师范学院工学院,甘肃天水741001

出　　处：《天水师范学院学报》2007年第2期65-67,共3页Journal of Tianshui Normal University

摘　　要：利用自蔓延燃烧合成技术制备用于铝及铝合金晶粒细化的Al-Ti-C中间合金时,在自蔓延(SHS)和热爆(TE)两种不同的燃烧模式下都能反应生成Al-Ti-C,通过XRD衍射分析发现两种引燃模式得到的Al-Ti-C均满足实现铝晶粒细化的前提条件,即含有Al3Ti和TiC相。同时,对燃烧产物Al-Ti-C进行微观组织形貌的观察,扫描电镜(SEM)分析表明,由于反应燃烧温度的不同,SHS模式下的产物其晶粒细小完整且能在Al基上分布均匀,而热爆模式下的产物有晶粒偏聚和烧结的现象出现,细化铝材时,热爆下的产物因为组织的偏聚烧结严重导致大量有效的细化因素沉淀,细化效果明显不如自蔓延产物。所以,从组织的细化性能出发,自蔓延模式更有利于燃烧合成Al-Ti-C中间合金的制备。Al-Ti-C master alloys used as grain refiners of the aluminum and its alloys have been prepared by self-propagating high-temperature synthesis. Both SHS and TE of combustion pattern can respond to generate Al-Ti-C. XRD diffraction has discovered that Al-Ti-C by two ignited patterns realized the condition of the grain refining performance, which contained Al3Ti and TiC. Through observed the microstructures of Al-Ti-C, SEM has showed that Al-Ti-C under SHS was small and complete in crystal grain and could spread on Al base or under TE was assembled and the phenomenon of sintering in crystal grain because of the difference burning temperature. In refining, the product by TE was not as good as obviously by SHS, since its seriously assembled organization caused thin factor sediment in large quantities efficiently. So the SHS igniting mode was helpful to combust Al-Ti-C master alloy more.

关 键 词：自蔓延燃烧合成 晶粒细化剂 Al—Ti—C中间合金 引燃模式 自蔓延 热爆 

分 类 号：TG146[一般工业技术—材料科学与工程]