Mg-???a族遷移金属合金の内部水素化

概要

論文の詳細を見る
Mg-Ⅲa transition metal alloys were hydrogenated at 773K (500℃) under 570 torr of hydrogen. The Ⅲa transition metals used were Sc, Y, and Ho as a lanthanide element. The hydrogenated alloys were examined for absorption and desorption behavior of hydrogen, internally hydrided structure, identification of hydrides, changes in hardness of the alloys, and effects of additive elements, such as Ag, Al, Cd, Li, Pb, Sn, and Zn, on the internal hydriding of Mg-5Y alloy. Results obtained are as follows: 1. The Mg-alloys containing Ⅲa transition metals could absorb much more amounts of hydrogen than magnesium-itself and form hydrides of the metals in the matrix. 2. These hydrides were identified as ScH2, YH2, and HoH2, respectively, and formed on the specific crystallographic planes in the magnesium matrix. They were so stable that they did not decompose by heat treatment in a vacuum at the hydrogenating temperature. 3. The Mg-Sc alloys were hardened by internal hydriding, while softening took place in the Mg-Y and Mg-Ho alloys by hydriding. This discrepancy might be attributed to the difference in compromise between the decrease of solid solution hardening and the increase of dispersion hardening by hydriding. However, because of dispersed stable hydrides, all the internally hydrided alloys were expected to have an appreciable strength at high temperatures. 4. Investigating the effect of each additive element added by 2-3 at% on the internal hydriding of Mg-5 mass% (1.5 at%) Y alloy, it was found that the hydriding was almost arrested by the addition of Ag, Al, Cd, Pb, and Sn, respectively, and arrested to a certain degree by the addition of Zn, while it was little affected by the addition of Li.

Mg-???a族遷移金属合金の内部水素化

スポンサーリンク

概要

著者

関連論文

スポンサーリンク