Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 121, Issue 7-8, Pages 4517-4531Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-022-09419-2
Keywords
Mg; Al composite plates; Bonding mechanism; Electron work function; Effective electron force; Normal stress
Funding
- Innovation Project of Graduate Education in Shanxi Province [2020BY110]
- National Natural Science Foundation of China [51871158]
- STIP of Shanxi [2020L0349]
- National Key Research and Development Program [2018YFA0707300]
- General Program of National Natural Science Foundation of China [51905372]
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This article investigates the bonding mechanism of Mg/Al laminate composites under low pressure during the initial bonding stages at reduction ratios of 14.5% and 21.75%. The study reveals that electrons overcome potential barriers between Mg and Al to form metallic bonds. The good agreement between theory and experiment highlights the importance of overcoming potential barriers in the early bonding stages of bimetal composite plates.
Mg/Al laminate composites were prepared at 400 celcius for 15 min through single-pass rolling with reduction ratio from 10 to 27%. The bonding mechanism of the initial bonding stage under low pressure was studied. Two critical statuses (beginning bonding and complete bonding) are found at the reduction ratio of 14.5% and 21.75%. In this article, the coincidence of the ratio of external force (normal stress) and internal force (electronic force) at the two critical points shows that electrons overcome the potential barriers of Mg and Al respectively and make them move freely to form metal bonds. The free movement of electrons between two metal interfaces forms a metallic bond, which bonds the two metals. The formation of metallic bonds overcomes the classical barrier to achieve electron free motion. The ratio of sigma(Mg) to sigma(Al) (sigma(Mg)/sigma(Al)) is 0.7340, and the ratio of f(Mg) to f(Al) (f(Mg)/f(Al)) is 0.7988, where it can be found that the former agrees well with the latter. The good agreement between theory and experiment proves that overcoming the potential barrier plays an important role in the early bonding stage of bimetal composite plates.
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