贮氢合金TiMn_(0.5)(V_4Fe)_(0.3)组织结构与吸放氢热力学性能测试  

Study on the Microstructure and Absorption/Desorption Thermodynamics Performance of TiMn_(0.5)(V_4Fe)_(0.3) Alloy

作　　者：刘守平[1] 刘小军[1] 刘志红[1] 楼渝英[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]重庆医药高等专科学校,重庆400030

出　　处：《材料导报》2009年第8期44-46,52,共4页Materials Reports

基　　金：重庆市自然科学基金(CSTC.2007BB4140);重庆大学研究生科技创新基金(200801A1B0110270)

摘　　要：研究测试了TiMn0.5(V4Fe)0.3合金的组织结构和热力学性能。结果表明,合金主相为体心立方(bcc)结构的TiFe相,SEM显示基体存在岛状结构,EDS分析表明岛状结构主要是Ti的偏析;随着合金颗粒粒径的减小,吸放氢容量降低,活化性能改善,平台压下降,平台斜率增大;随着温度的升高,合金的平台压力升高,贮氢量减少;合金放氢过程的焓和熵分别为-36.1kJ/mol、-126.9J/(mol.K);合金在充电过程中出现了钝化,但通过升高充电温度可以消除钝化现象。Microstructure and thermodynamics properties of TiMn0.5 （V4Fe）0.3 alloy is investigated. The resuits show that the alloy is mainly composed of body-center-cubic （bcc） TiFe phase, some colonies with containing much of titanium in the matrix phase are found from SEM. The reduction in size of alloy grain can decrease the charge/discharge capacity and platform pressure of the alloy, but can improve the activation performance and increases the platform pressure line slope. When temperature increases the platform pressure and charge/discharge capacity of the alloy will decrease. The enthalpy and entropy of the alloy in discharging process are -36. lkJ/mol and -126. 9J/（mol·K） respectively. Passivation is found in the process of charging at low temperature, but the passivation phenomenon can be eliminated by increasing the charging temperature.

关 键 词：组织结构 贮氢合金 钛基合金 热力学 

分 类 号：TG174.21[金属学及工艺—金属表面处理]