Dynamic Precipitation Behavior of a Mg-Zn-Ca-La Alloy During Deformation

The dynamic precipitation behavior of a Mg-Zn-Ca-La alloy during deformation has been investigated. A large amount of fine precipitates was detected after deformation, indicating that dynamic precipitation occurred. The precipitates at the grain boundaries included Ca 2 Mg 6 Zn 3 and Mg 4 Zn 7 , whe...

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Bibliographic Details
Published in:JOM (1989) 2019-07, Vol.71 (7), p.2202-2208
Main Authors: Du, Yuzhou, Ge, Yanfeng, Jiang, Bailing
Format: Article
Language:English
Subjects:
Aging
Alloys
Atomic radius
Calcium
Chemical precipitation
Chemistry/Food Science
Crystal structure
Deformation
Diffusion coefficient
Dislocation density
Dislocation mobility
Earth Sciences
Engineering
Environment
Extrusion
Fourier transforms
Grain boundaries
Grain growth
Grain size
Intermetallic compounds
Investigations
Magnesium
Mechanical properties
Nanoparticles
Physics
Precipitates
Precipitation hardening
Recrystallization
Scanning electron microscopy
Second-Phase Particles in Magnesium Alloys: Engineering for Properties and Performance
Temperature
Transmission electron microscopy
Ultrafines
Zinc
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Summary:The dynamic precipitation behavior of a Mg-Zn-Ca-La alloy during deformation has been investigated. A large amount of fine precipitates was detected after deformation, indicating that dynamic precipitation occurred. The precipitates at the grain boundaries included Ca 2 Mg 6 Zn 3 and Mg 4 Zn 7 , whereas the intergranular precipitates were mainly Mg 4 Zn 7 . Ca, which has a large atomic radius, preferred to segregate to grain boundaries, where it resulted in the formation of Ca 2 Mg 6 Zn 3 . Zn, which has a similar diffusion coefficient to Mg, resulted in Mg 4 Zn 7 being distributed around the matrix. The stability of the Mg 4 Zn 7 phase was enhanced in the as-extruded Mg-Zn-Ca-La alloy. The grain-boundary precipitates acted as effective obstacles to grain growth, giving rise to the formation of a refined microstructure. The intragranular Mg 4 Zn 7 precipitates hindered the mobility of dislocations, improving the mechanical properties. Additionally, a high density of ultrafine nanoparticles was detected in the un-dynamically recrystallized (DRXed) region, being related to the high density of dislocations therein.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-019-03468-x