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Superplasticity in Commercial and Experimental Compositions of Magnesium Alloy Sheet.

Tilman MM; Neumeier LA
MISSING :29 pages
The Bureau of Mines conducted research to evaluate superplastic behavior in commercial magnesium-base alloys az61a, zk60a, zw3, az31b, zw1, and an experimental mg-12 pct al alloy. Strain-rate sensitivity indices (m-values), maximum elongations, and effects of superplastic elongation on tensile properties were determined on fine-grained sheet. Inert-gas-pressure hemisphere-forming tests were conducted on selected sheet stock of the five alloys. Formability trials on az31b alloy sheet were conducted on industrial equipment for comparison with commercial superplastic forming of zn- al alloy. Closed-die-forming tests were performed on extruded zk60a rod. All alloys exhibited well over 100-pct elongation, indicating superplasticity, at temperatures and strain rates near the maximum m- values. Tensile properties were generally reduced following 100-pct superplastic elongation, but not to an extent that would preclude use of the commercial alloys in the superplastically deformed condition. The potential for industrial superplastic forming of az31b sheet was indicated by hemisphere forming in the laboratory and substantiated in industrial forming trials.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
Identifying No.
RI 8662
NIOSH Division
Source Name
Page last reviewed: November 19, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division