Routes to develop fine-grained magnesium alloys and composites for high strain rate superplasticity

Conference · Sat Jul 01 04:00:00 EDT 2000

OSTI ID:20104687

Mukai, Toshiji; Watanabe, Hiroyuki; Nieh, T G; Higashi, Kenji

Recent activities in the research of magnesium became higher in order to reduce the weight of components such as motor vehicles from the economical and ecological point of view. Superplastic properties of magnesium alloys and their composites were reviewed with a special emphasis on the achievement of high strain rate superplastic forming. The role of grain size on superplastic deformation mechanisms was particularly addressed. Commercial Mg-Al-Zn alloys and a ZK60-based composite are used as model materials to illustrate the underlining principles leading to the observation of high strain rate superplasticity. In this paper, experimental results from several processing routes, including thermomechanical processing, severe plastic deformation, and extrusion of machined chips and rapidly solidified powders, are presented. High strain rate superplasticity (HSRS) is demonstrated in ZK60-based composites.

• Research Organization: Osaka Municipal Technical Research Inst. (JP)
• Sponsoring Organization: US Department of the Army; US Department of Energy
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 20104687
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AUTOMOBILES
COMPOSITE MATERIALS
DEFORMATION
ELONGATION
EXPERIMENTAL DATA
GRAIN SIZE
MAGNESIUM ALLOYS
MATERIALS WORKING
PLASTICITY
WEIGHT