Abstract
A mixture of Al burrs of Al high-pressure die-castings and a blowing agent powder was used to fabricate Al foam-filled steel tubes by friction stir back extrusion (FSBE). It was shown that the mixture can be sufficiently consolidated to form an Al precursor that is coated on the inner surface of a steel tube by the plastic flow generated during FSBE. Namely, a precursor coated steel tube can be fabricated from Al burrs by FSBE. By heat treatment of the precursor coated steel tube, an Al foam-filled steel tube can be fabricated. Al foam was sufficiently filled in the steel tube, and the porosity was almost homogeneously distributed in the entire sample. In compression tests of the samples, the Al foam-filled steel tube fabricated from Al burrs exhibited similar compression properties to an Al foam-filled steel tube fabricated from the bulk Al precursor. Consequently, it was shown that an Al foam-filled steel tube cost-effectively fabricated from Al burrs by FSBE compares favorably with an Al foam-filled steel tube fabricated from the bulk Al precursor.
Highlights
Composite structures consisting of a dense metallic tube filled with aluminum (Al) foam have attracted interest in various industrial fields owing to their light-weight and good energy absorption properties [1,2]
A precursor-coated steel tube can be fabricated from ADC12 burrs by friction stir back extrusion (FSBE)
(2) An Al foam-filled steel tube can be fabricated by heat treatment of the precursor coated steel tube
Summary
Composite structures consisting of a dense metallic tube filled with aluminum (Al) foam have attracted interest in various industrial fields owing to their light-weight and good energy absorption properties [1,2]. Hamada et al and Toksoy et al demonstrated that bonding between the Al foam and Al tube with adhesives resulted in superior absorption properties to those without any bonding [3,5]. Bonaccorsi et al fabricated an Al foam-filled steel tube with metal bonding between the Al foam and steel tube by foaming a precursor in the steel tube [6]. Duarte et al fabricated an Al foam-filled Al tube with metal bonding between the Al foam and Al tube by foaming a precursor in the Al tube [9]
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