As-cast and rapidly solidified Ti_(23)V_(40)Mn_(37)alloy doped with Zr_(7)Ni_(10) was synthesized by arc melting and melt-spinning.The microstructure,activation property,hydrogen absorption kinetics,and hydrogen absor...As-cast and rapidly solidified Ti_(23)V_(40)Mn_(37)alloy doped with Zr_(7)Ni_(10) was synthesized by arc melting and melt-spinning.The microstructure,activation property,hydrogen absorption kinetics,and hydrogen absorption/desorption thermodynamics were investigated to evaluate a comprehensive hydrogen storage property of the alloys.Both preparation methods had a negligible effect on the lattice parameter of BCC and C14 Laves phases in the alloys.The alloy prepared by melt-spinning showed an increased proportion of BCC phase,larger hydrogen absorption capacity,faster hydrogen absorption rate,and higher hydrogen absorption/desorption platform pressure.The dehydriding enthalpy and endothermic peak temperature of the rapidly solidified alloy were 33.55±2.14 KJ/mol H_(2)and 526.2 K,respectively,which are smaller than those of the as-cast alloy.It indicates the decreased hydride stability and improved hydrogen desorption property.By contrast with the as-cast alloy,the rapidly solidified alloy showed a preferable comprehensive hydrogen storage property.展开更多
The bulk Ti-6Al-4V alloy was hydrogenated at the temperature range of 723-973 K,and the hydrogen absorption characteristics and hydrogen absorption kinetics were investigated.The results show that there are two types ...The bulk Ti-6Al-4V alloy was hydrogenated at the temperature range of 723-973 K,and the hydrogen absorption characteristics and hydrogen absorption kinetics were investigated.The results show that there are two types of hydrogen absorption characteristics at different temperatures.The hydrogen content decreases,and the time reaching reaction equilibrium is shorten with the isothermal hydrogenation temperature increasing.Meanwhile,the mechanism of the hydrogen absorption kinetics is different at different temperatures.The incubation period exists at the initial hydrogen absorption stage below 823 K,and K(a2)(the reaction rate constant of Stage 2)>>K(a1)(the reaction rate constant of Stage 1).And there is no incubation period over 823 K,K(a1)>>K(a2).展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.51674201)the Natural Science Foundation of Shaanxi Province(Grant No.2020JQ-906).
文摘As-cast and rapidly solidified Ti_(23)V_(40)Mn_(37)alloy doped with Zr_(7)Ni_(10) was synthesized by arc melting and melt-spinning.The microstructure,activation property,hydrogen absorption kinetics,and hydrogen absorption/desorption thermodynamics were investigated to evaluate a comprehensive hydrogen storage property of the alloys.Both preparation methods had a negligible effect on the lattice parameter of BCC and C14 Laves phases in the alloys.The alloy prepared by melt-spinning showed an increased proportion of BCC phase,larger hydrogen absorption capacity,faster hydrogen absorption rate,and higher hydrogen absorption/desorption platform pressure.The dehydriding enthalpy and endothermic peak temperature of the rapidly solidified alloy were 33.55±2.14 KJ/mol H_(2)and 526.2 K,respectively,which are smaller than those of the as-cast alloy.It indicates the decreased hydride stability and improved hydrogen desorption property.By contrast with the as-cast alloy,the rapidly solidified alloy showed a preferable comprehensive hydrogen storage property.
基金financially supported by Sichuan Province Science and Technology Project (No.2013VTZC04)
文摘The bulk Ti-6Al-4V alloy was hydrogenated at the temperature range of 723-973 K,and the hydrogen absorption characteristics and hydrogen absorption kinetics were investigated.The results show that there are two types of hydrogen absorption characteristics at different temperatures.The hydrogen content decreases,and the time reaching reaction equilibrium is shorten with the isothermal hydrogenation temperature increasing.Meanwhile,the mechanism of the hydrogen absorption kinetics is different at different temperatures.The incubation period exists at the initial hydrogen absorption stage below 823 K,and K(a2)(the reaction rate constant of Stage 2)>>K(a1)(the reaction rate constant of Stage 1).And there is no incubation period over 823 K,K(a1)>>K(a2).
