J. Mater. Sci. Technol. ›› 2010, Vol. 26 ›› Issue (2): 151-155.

• Research Articles • 上一篇    下一篇

Microstructure and tensile properties of ZK60 alloy fabricated by simplified rapidly solidification powder metallurgy (S-RS P/M) process

zhangzhenya1;于化顺2;王少卿2;王海涛3;闵光辉2   

  1. 1. 山东大学材料液态结构及其遗传性教育部重点实验室
    2. 山东大学
    3.
  • 收稿日期:2009-03-31 修回日期:2009-06-30 出版日期:2010-02-28 发布日期:2010-02-28
  • 通讯作者: 于化顺

Microstructure and Tensile Properties of ZK60 Alloy Fabricated by Simplified Rapid Solidification Powder Metallurgy (S-RS P/M) Process

Zhenya Zhang, Huashun Yu, Shaoqing Wang, Haitao Wang, Guanghui Min   

  1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, China
  • Received:2009-03-31 Revised:2009-06-30 Online:2010-02-28 Published:2010-02-28
  • Contact: Huashun Yu

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摘要：

This study investigated the microstructures and mechanical properties of ZK60 alloy prepared by a simplified RS P/M processing system (S-RS P/M) which consists of warm press in dry air and hot extrusion. Microstructure characterizations showed that S-RS P/M alloy consisted of magnesium matrix and oxide stringers of about ~1μm in width. TEM observations illustrated nano-size magnesia particles (10-30nm) constituted oxide stringer in detail. Due to a relatively higher volume of nano-size magnesia particle produced during S-RS P/M process, 0.2% yield strength of S-RS P/M ZK60 alloy was found to be as high as 384MPa which is 10% higher than that of RS P/M alloy. The improvement in mechanical properties is mainly attributed to the result from combination effects of Orowan mechanism and CTE mismatch because of approximately the same average grain size.

Abstract:

This study investigated the microstructures and mechanical properties of ZK60 alloy prepared by a simplified rapid solidification powder metallurgy (RS P/M) processing system (S-RS P/M), which consists of warm press in dry air and hot extrusion. Microstructure characterizations showed that S-RS P/M alloy consisted of magnesium matrix and oxide stringers of ~1 μm in width. TEM (transmission electron microscopy) observations illustrated nano-size magnesia particles (10{30 nm) constituted oxide stringer in detail. Due to a relatively higher volume of nano-size magnesia particle produced during S-RS P/M process, 0.2% yield strength of S-RS P/M ZK60 alloy was found to be as high as 382 MPa, which is 10% higher than that of RS P/M alloy. The improvement in mechanical properties is mainly attributed to the combination effects of Orowan mechanism and coe±cient of thermal expansion (CTE) mismatch because of the approximately same average grain size.

Key words: Microstructure, Mechanical properties, Rapid solidification powder metallurgy, Nano-size magnesia