Fabrication of Al-Coated Mg-Li Alloy Sheet and Investigation of Its Properties
来源期刊：Acta Metallurgica Sinica2019年第2期
论文作者：Tian-Long Zhang Toko Tokunaga Munekazu Ohno Mi-Lin Zhang Kiyotaka Matsuura
文章页码：169 - 177
摘 要：An Al-coated Mg-8 mass% Li alloy rectangular bar was fabricated by hot extrusion, and then, it was hot-rolled into a thin sheet. The Al coating was uniform in thickness and had good bonding with the substrate during all the processing. This Alcoated Mg–Li alloy exhibited a good corrosion resistance in a 0.5 mass% HCl aqueous solution. No intermetallic compound was observed at the Al/Mg–Li interface after the extrusion and the rolling. The Al-coated Mg–Li alloy sheet exhibited an elongation to fracture of 35% at room temperature at a strain rate of 0.001 s（-1）without any debonding between the coating and the substrate. When tensile tested at 573 K at 0.001 s（-1）in the air, the Al coating remained undamaged even until an elongation of about 150%. Further elongation generated cracks on the coating and the specimen fractured at an elongation of about 200%. In an Ar atmosphere, the specimen exhibited a fracture elongation of over 400% under the same conditions at 573 K at 0.001 s（-1）, although a large number of cracks generated on the Al coating.
Tian-Long Zhang1，Toko Tokunaga2，Munekazu Ohno2，Mi-Lin Zhang3，Kiyotaka Matsuura2
1. Graduate School of Engineering, Hokkaido University2. Faculty of Engineering, Hokkaido University3. College of Materials Science and Chemical Engineering,Harbin Engineering University
摘 要：An Al-coated Mg-8 mass% Li alloy rectangular bar was fabricated by hot extrusion, and then, it was hot-rolled into a thin sheet. The Al coating was uniform in thickness and had good bonding with the substrate during all the processing. This Alcoated Mg–Li alloy exhibited a good corrosion resistance in a 0.5 mass% HCl aqueous solution. No intermetallic compound was observed at the Al/Mg–Li interface after the extrusion and the rolling. The Al-coated Mg–Li alloy sheet exhibited an elongation to fracture of 35% at room temperature at a strain rate of 0.001 s（-1）without any debonding between the coating and the substrate. When tensile tested at 573 K at 0.001 s（-1）in the air, the Al coating remained undamaged even until an elongation of about 150%. Further elongation generated cracks on the coating and the specimen fractured at an elongation of about 200%. In an Ar atmosphere, the specimen exhibited a fracture elongation of over 400% under the same conditions at 573 K at 0.001 s（-1）, although a large number of cracks generated on the Al coating.
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