Tensile-compressive yield asymmetries in high strength wrought magnesium alloys

Journal Article · Fri Jul 15 00:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90159-7· OSTI ID:7108756

Ball, E A; Prangnell, P B ^[1]

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1. Univ. of Manchester (United Kingdom). Manchester Materials Science Centre UMIST, Manchester (United Kingdom)

Owing to magnesium's very low density (of 1.7 g/cm[sup 3]) there is potential for producing Mg alloys with higher specific strengths than those of existing aluminium alloys for applications where weight savings are at a premium. Magnesium alloys can also have greater creep resistance and superior elevated temperature specific tensile properties than those of Al. However, the hexagonal crystal structure of magnesium severely limits its available slip systems and preferred orientations can develop during working processes, slip occurring predominantly on the basal planes which leads to their alignment parallel to the direction of metal flow. As a geometric consequence of the c/a ratio of magnesium being less than ideal, twinning can theoretically only occur in compression, parallel to the basal planes, which would be expected to result in there being large asymmetries between the tensile and compressive yield stresses in textured wrought products. The compressive yield stresses in wrought magnesium alloys have been previously found in forgings to the 0.6--0.7 times those of the tensile. Such an asymmetric yield behavior, resulting in a poor compressive yield stress, would prohibit many potential applications for wrought Mg alloys. The aim of this paper is to investigate how significant the problem of yield asymmetry can be in two typical high strength wrought Mg alloys, the Mg-Y-Nd mischmetal based alloy, WE54, and the Mg-Zn-Cu based alloy, ZC71.

• OSTI ID: 7108756
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 31:2; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER ALLOYS
YIELD STRENGTH
MAGNESIUM ALLOYS
NEODYMIUM ALLOYS
YTTRIUM ALLOYS
ZINC ALLOYS
ALLOY SYSTEMS
EXPERIMENTAL DATA
MANGANESE ADDITIONS
MECHANICAL TESTS
RARE EARTH ADDITIONS
WEIGHT
ZIRCONIUM ADDITIONS
ALLOYS
DATA
INFORMATION
MANGANESE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
NUMERICAL DATA
RARE EARTH ALLOYS
TESTING
ZIRCONIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties