High-Strain-Rate Superplasticity in Mg-Y-Nd Alloy Prepared by Submerged Friction Stir Processing

作者：Cao, Genghua; Zhang, Datong^*; Chai, Fang; Zhang, Wen; Qiu, Cheng

来源：Advanced Engineering Materials, 2016, 18(2): 312-318.

DOI：10.1002/adem.201500221

• ZN-ZR ALLOY
• AZ91 MAGNESIUM ALLOY
• LOW-TEMPERATURES
• MICROSTRUCTURE
• DEFORMATION
• COMPOSITES
• EXTRUSION
• MECHANISM
• EVOLUTION
• BEHAVIOR

Superplastic tensile behavior of Mg-Y-Nd alloy prepared by submerged friction stir processing (SFSP) is investigated. Microstructure of the SFSP alloy is mainly composed of fine-grained magnesium grains (approximate to 1.3 mu m) and homogeneously distributed second-phase particles. Elongations are all above 500% within a wide high-temperature range of 708-758K at 1x10(-1)s(-1), and an elongation of 549% at 1x10(-1)s(-1) is achieved at 758K. The excellent high-strain-rate superplasticity is attributed to the fine-grained microstructure and high thermal stability during superplastic deformation. Grain boundary sliding is the dominated deformation mechanism during superplastic deformation, and the specimens failed through cavity coalescence.

• 出版日期2016-2
• 单位华南理工大学