Nb-Ni-Ti系L(βTi,Nb)+TiNi共晶相平衡研究  

Phase equilibria of eutectic transformation L(βTi,Nb)+TiNi in Nb-Ni-Ti system

作　　者：李洪晓[1] 兰志宇[1] 蒋敏[1] 秦高梧[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《材料与冶金学报》2012年第3期179-182,共4页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(50971037);辽宁省高校重点实验室支持计划项目(LS2010062)

摘　　要：采用合金平衡组织结构分析法结合热分析,研究了Nb-Ni-Ti系L(βTi,Nb)+TiNi共晶相平衡.结果表明,随着温度的降低,处于液相L、(βTi,Nb)和TiNi相三相平衡时的(βTi,Nb)相中Ni含量(摩尔分数)几乎不变,约为3.5%;而Nb的摩尔分数逐渐降低,从1 050℃时的62.6%,降为1 000℃时的54.1%;但TiNi相的成分变化不大.L+(βTi,Nb)+TiNi三相区也随温度的降低逐渐远离Nb-TiNi连线.并且随着Nb的溶入,Ti2Ni相的熔化温度也得以提高.The phase equilibria related with eutectic transformation L(β Ti,Nb)+TiNi of Nb-Ni-Ti system have been investigated through the equilibrated alloy method and DSC.It has been shown that,the three-phase field L+(β Ti,Nb)+TiNi shifted away from the Nb-TiNi tie-line with the decrease of the temperature;the Ni content(mole fraction)in(β Ti,Nb) was almost the same ~3.5%;but the mole fraction of Nb decreased as temperature dropped,from 62.6% at 1 050 ℃ to 54.1% at 1 000 ℃.The composition of TiNi phase varied little with temperature.The melt temperature of Ti2Ni increased with the solution of Nb atoms.

关 键 词：Nb-Ni-Ti系 相平衡 共晶转变 

分 类 号：TG113.14[金属学及工艺—物理冶金]