Effect of Mg on the Sintering of Al-Mg Alloy Powders by Pulse Electric-Current Sintering Process

Guoqiang Xie; Osamu Ohashi; Takahiro Sato; Norio Yamaguchi; Minghui Song; Kazutaka Mitsuishi; Kazuo Furuya

doi:10.2320/matertrans.45.904

Guoqiang Xie, Osamu Ohashi, Takahiro Sato, Norio Yamaguchi, Minghui Song, Kazutaka Mitsuishi, Kazuo Furuya

Author information

Keywords: deoxidization, pulse electric-current sintering, aluminium-magnesium alloy, oxide film, resistivity, tensile strength

JOURNAL FREE ACCESS

2004 Volume 45 Issue 3 Pages 904-909

DOI https://doi.org/10.2320/matertrans.45.904

Details

Abstract

Utilization of deoxidization mechanism of magnesium (Mg) is an effective method to remove the oxide films at aluminum (Al) alloy powder surface in pulse electric-current sintering (PECS) process. The continuous amorphous oxide film at Al alloy surface are broken and removed by deoxidization of Mg. Crystalline particles of MgAl₂O₄ or MgO, or both of them, are formed, which depend on Mg content in Al alloy powder and sintering temperature. After that the metal/metal contact is caused, and solid state sintering of Al alloy powder is facilitated. The electrical resistivity and tensile properties of powder compacts are improved by Mg addition. Based on the analyses of electrical resistivity, tensile properties and microstructures of the sintered specimens, optimum amount of Mg addition to improve the sintering properties of Al powder is determined to be 0.3—2.5 mass%.

Corresponding author

Register with J-STAGE for free!