自蔓延高温合成Ti-Ni-Nb形状记忆合金的产物组织  

Product Microstructure of Ti-Ni-Nb Shape Memory Alloy (SMA) by High-temperature Synthesis (SHS) of Self-propagating

作　　者：杨华斌[1] 殷为宏[1] 杨宗坡[2] 吝靖玉[1] 张小明[1] 郭继红[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]东北大学,辽宁沈阳110006

出　　处：《稀有金属材料与工程》2002年第2期152-155,共4页Rare Metal Materials and Engineering

摘　　要：采用自蔓延高温合成 (SHS)技术 ,进行 Ti- Ni- Nb形状记忆合金 (SMA)的燃烧合成试验。研究了粉末粒度、纯度和加热温度对热爆燃烧合成的产物组织的影响。结果表明 :纯度高的粉末 ,粒度细的铌粉和粒度适中的钛粉 ,有利于获得密度高和 (Ti,Nb) 2 Ni等杂相少的产物 ;当温度尚未达到热爆温度时 ,只能发生常规反应烧结 ;当达到热爆温度时 ,热爆的产物内存在着基体相 (Ti,Nb) Ni,杂相 (Ti,Nb) 2 Ni和由 β- Nb(Ti,Ni)与基体 (Ti,Nb) Ni形成的共晶相 ;在较高的热爆温度下 ,共晶相基本消失 。Experiments of the combustion synthesis of the Ti-Ni-Nb SMA have been done by SHS technique. The influences of powder particle size,purity and heating temperature on the microstructure of thermo-explosion synthesised products were investigated. It is found that the powders of higher purity, the fine niobium powders, and the titanium powders with moderate particle size (26 mum) are beneficial to the products of high-density and less impurity phase, such as (Ti,Nb)(2)Ni,etc. Regular reaction sintering occured only as the heating temperature is lower than 1 173 K for thermo-explosion reaction. At the thermo-explosion temperature, the synthesised products consist of the (Ti,Nb)Ni matrix phase,the (Ti,Nb)(2)Ni impurity phase and the eutectic phase beta-Nb(Ti,Ni) - (Ti,Nb)Ni. At the temperature higher than the thermo-explosion temperature, the eutectic phase nearly disapperaed, while the matrix grains are coarsened.

关 键 词：自蔓延高温合成 组织 钛基形状记忆合金 

分 类 号：TG139.6[一般工业技术—材料科学与工程]