Microstructural Control of 7075 Al Wrought Alloys through Thixoextrusion Route

Young Ok Yoon; Hyung Ho Jo; Jin Kyu Lee; Dong In Jang; Shae K. Kim

doi:10.4028/www.scientific.net/MSF.510-511.362

Paper Titles

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Microstructures and Tensile Properties of Fe-40Al Intermetallic with High Boron Content
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Fluidity of A356 Alloy during In-Ladle DTC Rheocasting
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High Temperature Mechanical Properties of Ni-Al-Cr Based Alloys with Refractory Alloying Elements
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Microstructural Control of 7075 Al Wrought Alloys through Thixoextrusion Route
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Thermal and Phase Evolutions of As-Milled Powders Fabricated by Mechanical Alloying in the TiH₂-C System
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H₂S/CO₂ Corrosion Behavior of Tubular Goods under High Temperature and High Pressure
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Improved Heat and Corrosion Resistance of Mg-Al-Zn Alloys by Additions of Minor Alloying Elements
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Characteristics of Spent Foundry Sand - Loess Mixture as Ceramic Support Materials
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Microstructural Control of 7075 Al Wrought Alloys through Thixoextrusion Route

Abstract:

Thixoextrusion, one of the thixoforming processes, has advantages of high productivity, reduction of the extrusion pressure, extension of the die life, and cost saving owing to its low energy consumption compared with the conventional extrusion processes. Especially, thixoextrusion process is expected to be very effective for hard-to-form materials with high strength. The present study focuses on 7075 Al wrought alloy to investigate the potential industrial applications of the thixoextrusion process. The microstructural evolution of 7075 Al wrought alloy for thixoextrusion was investigated with respect to isothermal holding temperature and time in the partially remelted semisolid state. The results showed that the liquid fraction increased with increasing isothermal holding temperature and time while the average grain size was inversely proportional to isothermal holding temperature and time up to 5min. However, there was no big change of liquid fraction and average grain size with respect to isothermal holding temperature and time. The important fact that the liquid fraction and average grain size were almost uniform after 5 min holding time is considered very useful for thixoextrusion in terms of process control.