Abstract
The liquid segregation phenomenon and its effect on deformation mechanism of Ti14 alloy in semisolid metal processing were investigated by thermal simulation test. Microstructure of depth profile was determined by cross-section quantitative metallography, and liquid segregation phenomenon was described by Darcy's law. The results show that segregation phenomenon was affected by solid fraction, strain rate, and deformation rate. More liquid segregated from center to edge portion with high strain rate and/or deformation ratio as well as low solid fraction, which caused different distribution of dominating deformation mechanism. The relationship between liquid segregation and main deformation mechanism was also discussed by phenomenological model.
Highlights
Flemings at MIT pioneered the study of the behaviors of metals and alloys in the semisolid state in 1974 [1]
Kang and Jung [10] showed that liquid segregation of Al alloys could be improved by adequate strain rate and solid fraction during compression
Chen and Tsao [11] implied the relationship between liquid segregation and deformation mechanism by phenomenological model
Summary
Flemings at MIT pioneered the study of the behaviors of metals and alloys in the semisolid state in 1974 [1]. Chen and Tsao [11] implied the relationship between liquid segregation and deformation mechanism by phenomenological model. These results showed that liquid segregation of alloy was a result of different flow behaviors of the solid with liquid phase and could affect the deformation mechanism. The objectives of the present work are to comprehensively study the liquid segregation phenomenological behaviors of Ti14 alloy [12, 13] (Ti-Al-Cu-Si, the content of Cu is more than 10%) and to explain the relationship between liquid segregation and deformation mechanism, which could improve theoretical basis for semisolid deformation of Ti alloys
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