Stoichiometry and annealing condition on hydrogen capacity of TiCr2-x AB2 alloys

Stoichiometry and annealing condition on hydrogen capacity of TiCr2-x AB2 alloys
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化学计量和退火条件对TiCr2-x AB2合金氢容量的影响

DOI:
10.1016/j.ijhydene.2023.12.062
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发表时间:
2024
影响因子:
7.2
通讯作者:
McGrath A
McGrath A
中科院分区:
工程技术2区
文献类型:
--
作者:
McGrath A

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研究了化学计量比和退火条件对Ti-Cr系AB_2型贮氢合金的影响。在退火之前,铸态合金的主要相是C14 Laves相,具有单独的Ti和Cr相。退火处理(1273 K/14 d)导致了C14到C15 Laves相结构的转变。C14(铸态)和C15(退火)的细胞大小增加与Ti含量,高达比(Cr/Ti)为1.6,由于B-位Ti取代晶格中的限制。压力组成等温线(PCI)测量表明,含较高Ti含量的合金具有较好的最大储氢容量1.5vs.1.03wt%)和较低的平台压力(9.4vs.15.8 bar)(253 K)。退火导致较低的存储容量(1.05vs.1.49 wt%)、较大的平台压力(约1000 mPa. 30巴)和更平坦的平台斜率(平台斜率减小25%)。退火合金的储氢容量的降低可能是由于在退火过程中合金中的残余Cr扩散到C15 Laves相中,从而改变了局部组成,如通过X射线衍射(XRD)所证实的。
This study presents the effect of stoichiometry and annealing condition on Ti–Cr AB2-type hydrogen storage alloys. Prior to annealing the majority phase of the as-cast alloys was the C14 Laves phase, with separate Ti and Cr phases. Annealing treatment (1273 K/14 d) led to a transition from C14 to C15 Laves phase structure. Both C14 (as-cast) and C15 (annealed) cell size increased with Ti content, up to a ratio (Cr/Ti) of 1.6, due to B-site Ti substitution in the lattice up to a limit. Pressure composition isotherm (PCI) measurements demonstrated alloys containing a greater Ti content had a better maximum hydrogen storage capacity (1.5vs.1.03 wt%) and lower plateau pressure (9.4vs.15.8 bar) at 253 K. Annealing resulted in a lower storage capacity (1.05vs.1.49 wt%), greater plateau pressure (ca. 30 bar) and flatter plateau slope (25 % reduction in plateau slope). Reduction in hydrogen storage capacity of annealed alloys could be due to diffusion of residual Cr in the alloy into the C15 Laves phase during the annealing process, thereby changing the local composition as confirmed through X-ray diffraction (XRD).
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