Development of High Performance Mg2Ni Hydrogen Storage Alloy with Nano-Grained Structure

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14183
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Kyushu University
• Principal Investigator: Horita Zenji 九州大学, 工学研究院, 教授 (20173643)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 水素貯蔵合金 / Mg合金 / 超微細結晶粒 / 巨大ひずみ加工 / 結晶粒界

Outline of Final Research Achievements

Mg alloys were processed by high-pressure torsion so that the grain refinement occurred to the nanosize. Hydrogen absorption became feasible at 423 K with faster hydrogen kinetics. This was due to the introduction of high densities of planar lattice defects such as grain boundaries and stacking faults. High rotation numbers of HPT processing for an MgZr alloy led to atomic order mixture of the elements and it was possible to absorb ~1 wt.% of hydrogen under 9 MPa in ~20 s at room temperature and fully desorb the hydrogen in the air. Two Mg alloys, Mg4NiPd and Mg4NiSn of which compositions were determined based on binding energy engineering, were also processed by HPT. Hydrogen absorption of 1.3% and 0.4%, respectively, was achieved after short time exposure to hydrogen atmosphere at 353 K.

Free Research Field

材料組織学