Affiliation:
1. Osaka University
2. Hyogo Prefectural Institute of Industrial Research
Abstract
The microstructure of the friction-bonded interface of Al alloys to low C steel
has been investigated by TEM observations to reveal the controlling factor of the
formation and growth of the IMC (Intermetallic Compound) layer, which caused the
premature fracture at the interface even when its thickness was less than 1 μm, as
reported in a previous paper. The thickness of the IMC layer observed at the interfaces
of Al-Mg alloy/steel and pure-aluminum/steel joints increased almost in proportion to
the friction time, but did not obey the parabolic law a characteristic kinetics of the
diffusion-controlled process. Analyses of SAD patterns from the IMC layer indicate that
it consisted of Fe2Al5, Fe4Al13, (Fe, Mn)Al6 and FeAl2, depending on the alloying
elements. These IMCs were granular and distributed almost randomly within the IMC
layer, suggesting that mechanical mixing of the steel with the Al alloy occurred at the
interface. In the low C steel adjacent to the IMC layer, a zone of much finer grains than
those of the base metal was observed. Its width increased with friction time and pressure,
and with the growth of the IMC layer, as well. These results suggest that the superficial
region of the steel underwent a heavy plastic deformation during the friction process
and it had a close relation with the growth of the IMC layer.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference16 articles.
1. S. Elliott and E.R. Wallach: Joining aluminium to steel Part 1-Diffusion bonding, Metal Construction, (1981), pp.167-171.
2. S. Elliott and E.R. Wallach: Joining aluminium to steel Part 2-Friction bonding, Metal Construction, (1981), pp.221-225.
3. R.F. Tylecote: The Solid Phase Welding of Metals, Edward Arnold Ltd., London, (1968), p.154.
4. S. Fukumoto, T. Ono, H. Tsubakino, M. Aritoshi, T. Tomita and K. Okita�Formation Process of Reaction Layer between Aluminum Alloys and Stainless Steel by Friction Welding�Journal of Light Metal & construction�40(2002), pp.22-28. (in Japanese).
5. M. Yilmaz and M. Acet: Interface properties of aluminum/steel friction-welded components, Materials Characterization, 49(2003), pp.421-429.
Cited by
21 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献