Influence of texture on superplastic behavior of friction stir processed ZK60 magnesium alloy

Commercial ZK60 extruded plate was subjected to friction stir processing (FSP). A fine-grained structure 2.9μm in grain size with uniformly distributed fine second-phase particles and predominant high-angle grain boundaries of 97% was obtained. A strong basal fiber texture with the (0002) planes rou...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2012-10, Vol.556, p.671-677
Main Authors: Yang, Q., Feng, A.H., Xiao, B.L., Ma, Z.Y.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
Elasticity. Plasticity
Elongation
Exact sciences and technology
Friction stir processing
Magnesium alloys
Magnesium base alloys
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Other heat and thermomechanical treatments
Physics
Plastic deformation
Superplastic forming
Superplasticity
Surface layer
Texture
Treatment of materials and its effects on microstructure and properties
Yield strength
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Summary:Commercial ZK60 extruded plate was subjected to friction stir processing (FSP). A fine-grained structure 2.9μm in grain size with uniformly distributed fine second-phase particles and predominant high-angle grain boundaries of 97% was obtained. A strong basal fiber texture with the (0002) planes roughly surrounding the tool pin surface was developed in the FSP ZK60 alloy. The FSP ZK60 alloy exhibited superplastic behavior at 225–325°C in both the transverse direction (TD) and longitudinal direction (LD), with the superplastic elongation in the LD being higher than that in the TD. A maximum elongation of 1390% was obtained at 300°C and 3×10−4s−1 in the LD. The existence of texture was found to influence the superplastic flow stress and plasticity. The texture had a minor influence on the flow stress, due to the texture weakening during superplastic deformation. However, the anisotropy of plasticity existed at all temperatures and strain rates, as a result of the activation of different slip systems in different tensile directions.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2012.07.046