Excellent High‐Strain‐Rate Superplasticity of Fine‐Grained ZK60 Magnesium Alloy Produced by Submerged Friction Stir Processing
Source abstract
Abstract
ZK60 magnesium alloy is produced via submerged friction stir processing (SFSP), and its microstructural characteristics and deformation behaviors at elevated temperature are investigated. Due to the severe plastic deformation with enhanced cooling rate, dynamic recrystallization occurs but grain growth is significantly retarded. Therefore, the as‐cast microstructure is greatly refined after SFSP, and an average grain size of 1.84 μm is attained. High‐strain‐rate superplasticity (HSRS) is observed at temperature of 573–723 K. A maximum elongation of 1205% is obtained at 1 × 10−2 s−1 and 673 K. The excellent HSRS is attributed to the uniform fine‐grained structure and the relatively high fraction of high‐angle grain boundaries (71.5%), which facilitate grain boundary sliding. The comparatively high portion of dispersed fine particles/precipitates also enhances the microstructural stability of the SFSP specimens. Grain boundary sliding is the dominated deformation mechanism for superplasticity and the failure of the deformed samples is due to the coalescence of cavities.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Magnesium Alloys: Properties and Applications · Advanced Welding Techniques Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National Engineering Research Center of Near-Net Shape Forming for Metallic Materials South China University of Technology Guangzhou 510640 China
School of Automotive & Transportation Engineering Shenzhen Polytechnic Shenzhen 518055 China
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