Abstract
The annealing effects of the CaLa series of alloys on homogenization and durability improvement have been investigated using X-ray diffraction, micrography and electrochemical measurement. It was found that annealing has no effect on the electrochemical durability of the La-free Ca-based alloy although it can be well homogenized. The phase structure of La-substituted CaNi5-type alloys was only changed a little by annealing the alloy at 900°C for 3 h, but the electrochemical durability could be improved. A high temperature, longer anneal of the CaLa series of alloys enabled better electrochemical cycling durability to be attained. The discharge capacity of the annealed alloys was decreased a little because of the vaporization of Ca when annealing for a long time.
Published Version
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