Hydrogen and its effect on the grinding of Ti-Ni powder

OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 23 No. 3 2021 Ta b l e 1 Lattice parameters of the formed phases Treatment type Phase lattice parameter, nm Initial state TiNi (austenite): a = 0.3007 ± 5 · 10 –4 TiNi (martensite): a = 0.2690 ± 5 ∙ 10 –4 b = 0.4570 ± 5 ∙ 10 –4 c = 0.4122 ± 5 ∙ 10 –4 β = 87.4° Ti 2 Ni: a = 1.1333 ± 5 · 10 –4 Ni 3 Ti: a = 0.5099 ± 5 · 10 –4 с = 0.8308 ± 5 · 10 –4 c/a = 1.6293 Mechanical treatment TiNi (austenite): a = 0.3009 ± 5 · 10 –4 TiNi (martensite): ? Ti 2 Ni: a = 1.1338 ± 5 · 10 –4 Ni 3 Ti: a = 0.5108 ± 5 · 10 –4 с = 0.8316 ± 5 · 10 –4 c/a = 1.6280 Mechanical treatment with pre-hydrogenation for 90 minutes TiNi (austenite): a = 0,2995 ± 5 · 10 –4 TiNi (martensite): ? Ti 2 Ni: a = 1.1393 ± 5·10 –4 Ni 3 Ti: a = 0.5067 ± 5 · 10 –4 с = 0.8241 ± 5 · 10 –4 c/a = 1.6265 Mechanical treatment with pre-hydrogenation for 180 minutes TiNi (austenite): a = 0.3004 ± 5 · 10 -4 TiNi (martensite): ? Ti 2 Ni: a = 1.1457 ± 5 · 10 –4 Ni 3 Ti: a = 0.5098 ± 5 · 10 –4 с = 0.8280 ± 5 · 10 –4 c/a = 1.6241