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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Microstructures and properties of reciprocating extruded
as-cast ZK60 magnesium alloy
JIANG Ting(姜  婷) 1, 2, GUO Xue-feng(郭学锋)2, MA Guang(马  光)1

1. Northwest Institute For Non-ferrous Metal Research, Xi’an 710016, China;
2. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China

Abstract:As-cast d 50 mm ZK60 magnesium alloys were reciprocating extruded for different passes under (335±5)℃. The microstructures and properties of the alloys were studied under different reciprocating extrusion passes. The results show that, reciprocating extruded microstructures were refined and uniformed effectively, in compared with as-cast condition. For 2 passes, the grain size is about 7 μm. After 4 passes, the grain size is about 6 μm. During reciprocating extrusion, refined as-cast eutectic and reinforcement phases in dispersed particles are uniformly distributed on matrix, and their size is less than 50 nm. The tensile strength, yield strength and the elongation of 4 passes reciprocating extruded as-cast ZK60 magnesium alloy are 311 MPa, 214 MPa and 17.93%, respectively. The thermal expansion coefficient of RE-4-EX-ZK60-CT magnesium alloy is the lowest. More or less extrusion passes can not decrease the value of the thermal expansion coefficient.

 

Key words: reciprocating extrusion; magnesium alloys; ZK60; dynamic recrystallization

ISSN 1672-7029
CN 43-1423/U

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