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为了研究不同退火方式对La0.75Mg0.25Ni3.44Co0.2Al0.03Ti0.03铸态合金的电化学性能影响,设计最终退火温度为1223K,并采用不同保温程序对合金进行退火处理。X射线衍射(XRD)与扫描电镜(SEM)分析一段、两段保温法退火后合金的结构与性能结果表明,铸态及退火后合金由LaNi5,(La,Mg)2(Ni,Co,Al)7相以及少量LaNi2、TiNi3相组成,且退火后合金中(La,Mg)(Ni,Co,Al)3相出现。前者微观组织较后者均匀,并且前者的放电容量、放电效率好于后者。一段保温法更有利于改善合金的循环稳定性。
In order to study the effect of different annealing methods on the electrochemical performance of La0.75Mg0.25Ni3.44Co0.2Al0.03Ti0.03 cast alloy, the final annealing temperature was designed to be 1223K and the alloys were annealed with different heat preservation procedures. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis of the structure and properties of the alloy after one-stage and two-stage annealing after annealing show that the as-cast and annealed alloys consist of LaNi5, (La, Mg) 2 ) 7 phase and a small amount of LaNi2, TiNi3 phase, and the (La, Mg) (Ni, Co, Al) 3 phase appears in the alloy after annealing. The former microstructure than the latter uniform, and the former discharge capacity, discharge efficiency is better than the latter. A period of insulation method is more conducive to improving the cycle stability of the alloy.