MICROSTRUCTURE OF BINARY Mg-Al EUTECTIC ALLOY WIRES PRODUCED BY THE OHNO CONTINUOUS CASTING PROCESS

金属学报(英文版), 2008, 21(4): 275-281.

^1, , ^2, , ^3, , ^4,

1.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

2.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

3.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

4.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

基金项目: Scientific research project of Education Department of Shaanxi Province(07JK358) 陕西省自然科学基金(2003E111) the Industrialization Cultivation Project of Education Department of Shaanxi Province(04JC24)

MICROSTRUCTURE OF BINARY Mg-Al EUTECTIC ALLOY WIRES PRODUCED BY THE OHNO CONTINUOUS CASTING PROCESS

Z.M.Zhang ^1, , T.Lū ^2, , C.J.Xu ^3, , X.F.Guo ^4,

1.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

2.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

3.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

4.School of Materials Science & Engineering,Xi'an University of Technology,Xi'an 710048,China

Keywords： Mg-Al alloy

Directionally solidified binary Mg-Al eutectic alloy wires of approximately 5 mm in diameter were produced by the Ohno continuous casting (OCC) process and the mi-crostructure was examined.It was found that the wires possess obvious unidirectional growth characteristic along its axial direction.The microstructure consists of parallel columnar grains that resulted from the competitive growth of equiaxed grains solidified on the head of dummy bar.Each columnar grain comprises regular eutectic α-Mg and β-Mg17 Al12 phases,which grew along the axial direction of the wires.The morphology of the eutectic is mainly lameUar,meanwhile rod eutectic exists.The formation of rod eutectic was attributed to the "bridging effect" caused by incidental elements in the alloy.

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MICROSTRUCTURE OF BINARY Mg-Al EUTECTIC ALLOY WIRES PRODUCED BY THE OHNO CONTINUOUS CASTING PROCESS

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