由FeV80合金制备的V_(28)Ti_(32)Cr_(28)Mn_6Fe_6合金的组织结构及吸放氢特性  

Microstructure and Absorption/Desorption Properties of V_(28)Ti_(32)Cr_(28)Mn_6Fe_6 Alloy Prepared from FeV80 Alloy

作　　者：王林元[1] 段蜀波[1] 

机构地区：[1]西南石油大学,四川成都610500

出　　处：《稀有金属材料与工程》2011年第3期462-465,共4页Rare Metal Materials and Engineering

摘　　要：通过XRD、SEM/EDS及PCT测试研究了由FeV80合金制备的V28Ti32Cr28Mn6Fe6合金的组织结构及吸放氢特性。该合金由bcc相和C14Laves第二相构成。由于合金中氧含量(0.83%,质量分数)较高,因而吸放氢容量较低,动力学性能较差。通过添加一定量的稀土元素La(1%～10%,质量分数),可显著降低合金中的氧含量,从而提高其动力学性能和吸放氢容量。当La的添加量达到4.0%时,合金具有最佳的吸放氢性能,吸氢量达到3.62%,放氢量达到2.13%;合金氢化物的生成焓为(-40.0±1)kJ/mol·H2。The phase,microstructure and absorption/desorption properties of V28Ti32Cr28Mn6Fe6 alloy prepared from FeV80 alloy were researched by XRD,SEM/EDS and PCT measurement.The prepared alloy consists of two phases,bcc main phase and C14 Laves minor phase.This alloy shows low absorption/desorption capacities and poor absorption kinetics due to the high oxygen content of 0.83wt% originated from the FeV80 source.After addition of rare-earth metal of La,the oxygen content is obviously decreased,and the mechanical properties and absorption/desorption capacities are markedly increased.The addition of 4.0wt% La brings about the optimal hydrogen absorption and desorption properties,i.e.an absorption capacity of 3.62wt% H and desorption capacity of 2.13wt% H at 293 K.The formation enthalpy of the hydride of the 4.0wt% La containing alloy is-40.0±1 kJ/mol·H2.

关 键 词：贮氢材料 钒基贮氢合金 FeV80合金 吸放氢特性 

分 类 号：TG139.7[一般工业技术—材料科学与工程]