采用熔融纺丝法制备Ti1-xLaxFe0.8Mn0.2(x=0,0.01,0.03,0.06,0.09,摩尔分数)快淬态合金.研究La替代Ti对TiFe型Ti-Fe-Mn基合金显微组织、贮氢动力学和贮氢热力学的影响.所有快淬态合金均保持单一的TiFe相;加氢后,TiFe相转变为TiFeH0.06、TiFeH和TiFeH2氢化物.La替代促进合金微观缺陷(如位错和晶界)的产生,这利于氢扩散.此外,La替代还提高储氢动力学性能.随La含量的增加,合金的贮氢容量先减小后增大,氢化焓变的绝对值(|ΔH|)先增大后减小.当x=0.01时,合金加氢焓变的绝对值|ΔH|最大,为(25.23±0.50)kJ/mol,在323 K、3 MPa条件下合金的最大贮氢容量为(1.80±0.04)wt.％.“,”The as-spun Ti1-xLaxFe0.8Mn0.2 (x=0, 0.01, 0.03, 0.06, 0.09, molar fraction) alloys were prepared by melt spinning. The effects of La substitution for Ti on the microstructure, hydrogen storage kinetics and thermodynamics of TiFe-type Ti-Fe-Mn-based alloy were investigated. The as-spun alloys hold the TiFe single phase, which transforms to TiFeH0.06, TiFeH, and TiFeH2 hydrides after hydrogenation. La substitution promotes the formation of micro-defects (such as dislocations and grain boundaries) in the alloys, thus facilitating hydrogen diffusion. In addition, the hydrogen storage kinetics properties are improved after introducing La element. With the rise of La content, the hydrogen storage capacity decreases firstly and then increases, but the absolute value of hydriding enthalpy change (|ΔH|) increases firstly and then reduces. When x=0.01, the maximum value of |ΔH| is obtained to be (25.23±0.50) kJ/mol for hydriding, and the alloy has the maximum hydrogen absorption capacity of (1.80±0.04) wt.％ under the conditions of 323 K and 3 MPa.