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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 1    February 2004

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Effects of die angle on microstructures and mechanical
properties ofAZ31 magnesium alloy processed by equal
channel angular pressing
LI Yuan-yuan(李元元), LIU Ying(刘 英), NGAI Tungwai Leo(倪东惠),
ZHANG Da-tong(张大童), GUO Guo-wen(郭国文), CHEN Wei-ping(陈维平)

Advanced Metallic Materials Research and Processing Technology Center,
South China University of Technology, Guangzhou 510640, China

Abstract:AZ31 Mg alloy was prepared through equal channel angular pressing (ECAP) by Bc route in two different dies, in which the intersecting angles between channels are 90°and 120°respectively. Microstructures and tensile behaviors of the processed material at room temperature were investigated. The 90°die could provide more effective grain refinement in one pass of ECAP. But after multiple passes of deformation and when the total strain reached about 8, the alloy processed by the two dies acquired tiny homogeneous equiaxed grains with a mean size of 1 5μm and possessed similar mechanical properties with a large ductility of above 45% and a yield strength of 100 MPa, which are much different from the ductility of 18% and the yield strength of 200 MPa for the conventionally extruded material. The X-ray diffraction results show a great difference on peak of the basal plane (0001) between sections perpendicular and parallel to the extrusion direction for the conventionally extruded alloy but the difference lowers much for the ECAP processed alloy. The ultrafine-grain microstructure and the texture or scattered orientation of the basal plane (0001) has the great effect on the alloy s mechanical behavior.

 

Key words: AZ31 magnesium alloy; ECAP; die angle

ISSN 1672-7029
CN 43-1423/U

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