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磁性蓄冷材料Er3Ni在液氦温区的回热式低温制冷机中已经被广泛应用,在以He-H2混合气体为工质的脉管制冷实验中发现Er3Ni与H2会发生反应,其产物在一定程度上提高了制冷机的性能,本文基于金属储氢过程的理论框架,分析了Er3Ni吸氢的机理,并推算了Er3Ni的理论吸氢量.对Er3Ni在室温条件下的吸氢量进行了实验测量,结果显示Er3Ni经活化后能与H2充分反应,并生成氢化物Er3NiH8,与理论推算结果非常吻合.“,”Magnetic material Er3Ni is one of the common regenerative materials used in 4 K cryocoolers.The experiments on a pulse tube cryocooler with He-H2 mixtures as working fluid and Er3Ni as regenerative material demonstrated a significant improvement in refrigeration performance than the thermodynamic analytical results,which was attributed to the hydride Er3NiHx from Er3Ni-H2 reaction.The hydrogenation mechanism of Er3Ni is analyzed,and the theoretical hydrogen absorption capability is also predicted.The measurement of the practical hydrogen absorption capability of activated Er3Ni at ambient temperature shows that the hydride Er3NiH8 can be obtained from fully developed hydrogenation,which is coincident with the theoretical prediction.