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Improvement of mechanical properties of extruded AZX912 magnesium alloy using high-temperature solution treatment

Published online by Cambridge University Press:  02 October 2019

Xinsheng Huang Open the ORCID record for Xinsheng Huang [Opens in a new window] ,
Yasumasa Chino ,
Hironori Ueda ,
Masashi Inoue ,
Futoshi Kido  and
Toshiharu Matsumoto
Xinsheng Huang*
Affiliation:
Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi 463-8560, Japan
Yasumasa Chino
Affiliation:
Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi 463-8560, Japan
Hironori Ueda
Affiliation:
Technical Headquarter Fuji Light Metal Co., Ltd., Tamana, Kumamoto 869-0912, Japan
Masashi Inoue
Affiliation:
Technical Headquarter Fuji Light Metal Co., Ltd., Tamana, Kumamoto 869-0912, Japan
Futoshi Kido
Affiliation:
Technical center Tobata Seisakusho Co., Ltd., Kitakyushu, Fukuoka 800-0211, Japan
Toshiharu Matsumoto
Affiliation:
Technical center Tobata Seisakusho Co., Ltd., Kitakyushu, Fukuoka 800-0211, Japan
*
a)Address all correspondence to this author. e-mail: huang-xs@aist.go.jp
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Abstract

For achieving flame-retardant AZX912 magnesium alloy with superior mechanical properties, cast ingots were solution-treated at different temperatures of 420–525 °C prior to extrusion at 280 °C. With increasing solution treatment temperature, brittle Al2Ca intermetallic compound changed from a network-like morphology to a spheroidized shape, with an increase in hardness and became unbroken during extrusion. As the solution treatment temperature increased, cracking of Al2Ca particles during tensile deformation tended to be restricted due to hardening and spheroidizing behaviors, and tensile elongation of extruded alloys significantly enhanced from 11.2 to 19.2%. High mechanical strength was maintained with an improvement in ductility when increasing the solution treatment temperature up to 510 °C. The extruded alloy solution-treated at 510 °C exhibited a superior balance between mechanical strength and ductility, with a high ultimate tensile strength of 367 MPa and a good elongation of 16.8%.

Keywords

magnesium alloysolution heat treatmentextrusionmicrostructuremechanical property
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 21 , 14 November 2019 , pp. 3725 - 3734
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

b)

Present Address: Technical Headquarter Fuji Light Metal Co., Ltd., Tamana, Kumamoto 869-0912, Japan.

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