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

• Light Weight Metals • Previous Articles     Next Articles

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

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