摘要
采用燃烧波淬火法，获得了Ｔｉ４４Ｎｉ４７Ｎｂ９三元系的燃烧波熄灭界面。通过对该界面及界面前后的组织形貌分析和相组成变化的分析，弄清了该三元系合金在自蔓延高温合成中的结构形成机理。首先是，产生以Ｔｉ２Ｎｉ为主的化合物共晶液相，这是燃烧产生和蔓延持续的先决条件。紧接着是各组元Ｎｉ，Ｔｉ，Ｎｂ在共晶中的相继溶解，共晶中的主要相中Ｔｉ２Ｎｉ经过Ｎｉ３Ｔｉ，ＴｉＮｉ转变为ＴｉＮｉ（Ｎｂ）相。合成转化是受Ｎｂ，Ｔｉ元素在共晶液相中的溶解速度控制的。证明Ｖａｄｃｈｅｎｋｏ提出的组元溶解控制反应的机制，也适用于ＴｉＮｉＮｂ三元体系的燃烧合成。
A
combustion boundary of the Ti 44 Ni 47 Nb 9 alloy has been attained by combustion front
quench (CFQ). The structures of the boundary and related products were analyzed using Xray
and electronic probe scanning microanalysis (EPSM). It is found that an initial liquid phase
mainly containing Ti 2 Ni phase is a precondition of combustion reaction and propagating
combustion. The combustion propagation depends upon the infiltration of eutectic liquid, and
the combustion synthesis is controlled by resolving components Nb and Ti into the eutectic
liquid phase. It is confirmed that the reaction mechanism controlled by the components
resolving, which is suggested by Vadchenko for bielement system, is suitable for SHS of
TiNiNb.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1999年第2期81-84,共4页
Rare Metal Materials and Engineering
