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Anelastic Behaviour of Commercial Die-Cast Magnesium Alloys: Effect of Temperature and Alloy Composition
- Source :
- Materials, Materials; Volume 14; Issue 23; Pages: 7220, Materials, Vol 14, Iss 7220, p 7220 (2021)
- Publication Year :
- 2021
-
Abstract
- The anelastic deformation, resulting from partial reversal of {101¯2} twinning, is studied at room temperature to 150 °C on several commercial die-cast magnesium alloys for the first time. The magnitude of anelastic strain decreases with increasing temperature. For inter-alloy comparison, AZ91 shows the largest maximum anelastic strain, while AM40 and AM60 show similar maximum anelastic strain. The phenomenon is discussed in terms of solid solution softening and hardening of slip planes and how they influence twinning. T5-aged AE44 consistently shows smaller magnitude of anelasticity compared to as-cast AE44, suggesting that the precipitates formed during ageing may decrease the twin-boundary mobility and further suppress untwinning. Presence of anelasticity poses a challenge to yield strength measurement using the conventional 0.2% offset method, and a more accurate and consistent method of using a higher offset strain or a lower modulus is proposed in this study.
- Subjects :
- Technology
Materials science
yield strength
Modulus
chemistry.chemical_element
elastic modulus
anelasticity
mechanical properties
magnesium alloys
die casting
Article
General Materials Science
Composite material
Elastic modulus
Softening
Microscopy
QC120-168.85
Magnesium
QH201-278.5
Engineering (General). Civil engineering (General)
TK1-9971
Descriptive and experimental mechanics
chemistry
Hardening (metallurgy)
Electrical engineering. Electronics. Nuclear engineering
TA1-2040
Deformation (engineering)
Crystal twinning
Solid solution
Subjects
Details
- ISSN :
- 19961944
- Volume :
- 14
- Issue :
- 23
- Database :
- OpenAIRE
- Journal :
- Materials (Basel, Switzerland)
- Accession number :
- edsair.doi.dedup.....7e08b14bfd0f3134887e5714fbb824c3