Synthesis and microstructure control of Mg alloy powder composites by multi-extrusion

• Published in: Journal of alloys and compounds Vol. 509; pp. S247 - S249
• Main Authors: Kim, Taek-Soo, Chae, Hong Jun, Kim, Sun-Mi, Choi, Hanshin, Kim, Hye Sung
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2011
• Subjects: Alloy powders; Composite materials; Extrusions; Grain size; Magnesium base alloys; Mathematical analysis; Microstructure; Microstructure control; Particulate composites; Powder technology; Rapid solidification; Reduction; Powder technology; Composite materials; Microstructure control; Rapid solidification
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2011.02.075

► The diameter and thickness of Mg 97Zn 1Y 2 fiber were reduced depending on the extrusion ratio and the number of extrusion. ► When the extrusion was produced from the first-pass to fifth-pass, Mg 97Zn 1Y 2 fiber largely was refined from 8.2 mm to 0.11 mm (about 70%). ► Increment of extrusion pass will refine the microstructure to the nano-size only using the plastic deformation process. Control of the microstructure of Mg-alloy powder composites was successfully conducted using the powder extrusion process. The resultant microstructure was analyzed as a function of the number of extrusions and area reduction ratio. The grain size ( r n ) was proportionally reduced as the number ( n) of extrusions and the area reduction ratio ( R) increased. The variation in grain size agreed well with the value estimated using an equation of r n = r n−1 / R 1/2. The effect of the microstructure control on the mechanical properties will also be discussed. This investigation identified that the process was not only useful for controlling the microstructure, but also abbreviating the de-canning step among the alloy powder consolidation frequently used.