Effect of ball milling and cold rolling on hydrogen storage properties of nanocrystalline TiV_1.6Mn_0.4 alloy

Samuel Couillaud (1) , H. Enoki (2) , S. Amira (3) , Jean-Louis Bobet (1) , Etsuo Akiba (2) , J. Huot (3)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 AIST - National Institute of Advanced Industrial Science and Technology
3 Physics Department, Institut de Recherche sur l'Hydroge?ne

The effect of high energy milling and cold rolling on the BCC solid solution TiV_1.6Mn_0.4 was investigated. The as-cast alloy presented a nanocrystalline structure with a crystallite size of 17 nm. After 5 h of milling a slight reduction of crystallite size was measured and the BCC solid solution lattice parameter was reduced from 3.082 Å to 3.061 Å. Cold rolling also had for effect a reduction of crystallite size and lattice parameter. The main effect of cold rolling was to produce a highly textured alloy along the (2 0 0) Bragg peak. The as-cast alloy could store a maximum of 3.48 wt.% of hydrogen at 423 K and has a reversible capacity of 1.8 wt.%. The ball -milled and cold rolled samples did not absorb hydrogen even after 10 hydrogenation/dehydrogenation cycles. Possible reasons why ball milled and cold rolled samples did not absorb hydrogen are discussed.

Mots clés: Cold rolling; Ball milling; BCC alloys; Nanocrystalline; Hydrogen absorption

Domaines: Matériaux

Samuel Couillaud, H. Enoki, S. Amira, Jean-Louis Bobet, Etsuo Akiba, et al.. Effect of ball milling and cold rolling on hydrogen storage properties of nanocrystalline TiV_1.6Mn_0.4 alloy. Journal of Alloys and Compounds, 2009, 484 (1-2), pp.154-158. ⟨10.1016/j.jallcom.2009.05.037⟩. ⟨hal-00426236⟩