Effects of mechanical milling on hydrogen storage properties of Ti 0.32 Cr 0.43 V 0.25 alloy
Effects of mechanical milling on hydrogen storage properties of Ti 0.32 Cr 0.43 V 0.25 alloy
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DOI：
10.1016/j.ijhydene.2007.07.010
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
B. Singh;Gunchoo Shim;Sung-Wook Cho
中科院分区：
文献类型：
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作者：
B. Singh;Gunchoo Shim;Sung-Wook Cho
采用电弧熔炼和高能球磨相结合的方法制备了Ti0.32Cr0.43V0.25储氢合金。研究了200rpm下不同时间段(30-300min)球磨的效果。合金的储氢容量随球磨时间的增加而降低。储氢量下降的原因有两方面：合金粉末表面的污染和微观组织的变化。后者包括晶格应变的增加、微晶尺寸的减小和亚晶界的增加。尽管显微组织发生了变化，但合金的体心立方相保持不变，晶格常数基本保持不变。
The hydrogen storage alloy of Ti0.32Cr0.43V0.25was prepared by arc melting and high energy ball milling. Effects of ball milling were studied for various time periods (30–300min) at 200rpm. The hydrogen storage capacity of the alloy decreased with the increase in milling time. The reasons for the drop in the hydrogen storage capacity are twofold: surface contamination of the alloy powder and the microstructural changes. The latter includes the increase in lattice strain, the decrease in crystallite size and the consequent increase in subgrain boundaries. Despite the microstructural changes, the BCC phase of the alloy was maintained and its lattice constant remained nearly the same.