Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 319, Issue -, Pages 735-740Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(00)02016-5
Keywords
die-cast Mg-Al-alloys; AZ91; creep; work hardening; precipitation hardening
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The creep resistance of five high-purity die-cast Mg-Al-alloys was investigated in uniaxial compression at temperatures from 70 to 150 degreesC. The evolution of deformation resistance under creep conditions is described as a function of strain epsilon. The work hardening in primary creep determines the times for creep by strains <0.01. Among the investigated alloys AZ91 has the highest creep resistance with the exception of AS41 at stresses below 130 MPa, The microstructural origin of the creep resistance of Mg-Al-alloys is discussed in terms of work hardening by dislocations and hardening by creep-induced precipitation. (C) 2001 Elsevier Science B.V. All rights reserved.
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