High strain rate superplasticity in an Al-Mg alloy containing scandium
- Kyushu Univ., Fukuoka (Japan). Dept. of Materials Science and Engineering
- Univ. of Southern California, Los Angeles, CA (United States)
- Fukuoka Univ. of Education (Japan). Dept. of Technology
Superplastic forming is a well-established industrial process for the fabrication of complex shapes in sheet metals. It has been suggested that it may be possible to achieve superplasticity at high strain rates in conventional materials by making a substantial reduction in the grain size. This may be achieved by using a process such as equal-channel angular (ECA) pressing, where the sample is subjected to intense plastic straining in simple shear, because it is well established that ECA pressing leads to significant grain refinement in large-grained polycrystalline materials down to the submicrometer or even the nanometer level. High strain rate superplasticity (HSR SP) has been widely documented in a range of metal matrix composites, mechanically alloyed materials and in alloys fabricated using powder metallurgy procedures and very recently there was a report of HSR SP in commercial cast Al-based alloys after ECA pressing. The present investigation was initiated in order to evaluate the potential for achieving HSR SP in an Al-3% Mg alloy containing a scandium addition. Scandium was selected for use in this investigation because it is well established that dilute amounts of scandium in the Al-Mg system lead to a considerable enhancement in both the strength and the thermal stability of the material.
- OSTI ID:
- 619531
- Journal Information:
- Scripta Materialia, Vol. 38, Issue 12; Other Information: PBD: 12 May 1998
- Country of Publication:
- United States
- Language:
- English
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