Fabrication of Al-Coated Mg–Li Alloy Sheet and Investigation of Its Properties
Fabrication of Al-Coated Mg–Li Alloy Sheet and Investigation of Its Properties
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DOI：
10.1007/s40195-018-0774-9
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Tianglong Zhang;T. Tokunaga;M. Ohno;Milin Zhang;K. Matsuura
中科院分区：
文献类型：
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作者：
Tianglong Zhang;T. Tokunaga;M. Ohno;Milin Zhang;K. Matsuura
采用热挤压法制备了Mg-8质量% Li合金铝包覆矩形棒材，然后将其热轧成薄板。在整个加工过程中，铝涂层厚度均匀，与基体结合良好。该铝包覆Mg-Li合金在0.5质量% HCl水溶液中表现出良好的耐腐蚀性。挤压和轧制后，Al/ Mg-Li界面未发现金属间化合物。在室温下，当应变速率为0.001 s−1时，al涂层Mg-Li合金板材的断裂伸长率为35%，涂层与基体之间无脱粘现象。在573 K、0.001 s−1的空气条件下进行拉伸试验时，即使伸长率达到150%左右，Al涂层仍未受到损伤。进一步伸长率在涂层上产生裂纹，试样在伸长率约为200%时断裂。在Ar气氛下，试样在573 K、0.001 s−1温度下的断裂伸长率超过400%，但在Al涂层上产生了大量裂纹。
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 Al-coated 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−1without any debonding between the coating and the substrate. When tensile tested at 573 K at 0.001 s−1in 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.