1987 Fiscal Year Final Research Report Summary
Amorphization of the Intermetallic Compounds by Hydrogen Absorption and the Magnetic Properties of the Amorphous Alloys
| Project/Area Number |
61550519
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
AOKI Kiyoshi Institute for Materials Research, Tohoku University, 金属材料研究所, 助手 (70124542)
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| Co-Investigator(Kenkyū-buntansha) |
KIMURA Hisamichi Institute for Materials Research, Tohoku University, 金属材料研究所, 助手 (00161571)
MASUMOTO Tsuyoshi Institute for Materials Research, Tohoku University, 金属材料研究所, 教授 (20005854)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Hydrogen Absorption / Amorphous Alloys / Intermetallic Compound / Laves Phase / 磁気的性質 / 水素化物 |
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| Research Abstract |
Hydrogen-induced amorphization(HIA) has become one of the most attractive methods for producing amorphous alloys without rapid quenching. However, amorphizing alloy systems, the structure, the progress, and the mechanism of HIA are still uncertain. The purposes of the present investigation are to examine the nature of HIA, to obtain a detailed understanding of the progress, and to examine the magnetic properties of the resultant amorphous alloys. By hydrogenation of the Laves phase RM_2 compounds( R = a rare earth metal, M = Fe, Co, Ni), the amorphous RM_2H_2 alloys were synthesized where the decomposition of the compounds into the RH_2 and M(or an intermetallic compound) is suppressed because of low diffusion rates of the metallic atoms. The whole crystalline phase does not transform to the amorphous state at a time, but the amorphous phase nucleates and grows with increasing hydrogen conten. The magnetic properties of the hydrogen induced amorphous alloys are identical to those of the hydrogenated amorphous alloys, suggesting similarity of their structures.
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