Preparation of Mg−Ti system alloy and FGM with density gradient by spark plasma sintering technique

Abstract

A new kind of functionally graded materials (FGM) with density gradient has come to show great potentials as flier-plates for creating quasi-isotropic compression waves. In order to meet the demand of lower density in the front face for such flier-plate, Mg with a low density of 1.74 g/cm³ is selected to make a Mg−Ti FGM. Mg−Ti alloys with various weight ratios were sintered by spark plasma sintering (SPS) technique at relative low temperatures, and the processing of densification is mainly investigated. It is found that, up to 75wt% Ti, the Mg−Ti alloys can be fully densified at 560°C due to the conglutination of Mg and the formation of a small amount of Mg−Ti solid solution. Finally, the Mg−Ti FGM with a density gradient from 1.74 g/cm³ to 3.23 g/cm³ is successfully fabricated.

Keywords

Mg−Ti alloy / Mg−Ti FGM / SPS technique

References

[1] Barker L M, Scott D D/Development of a High-Pressure Quasi-Isentropic Plane Wave Generating Capability,SAND84-0432, 1984

[2] Chhabildas L C, Reinhart W D, Hall C A. Enhanced Hypervelocity Launcher—Capabilities to 16km/s. International Journal of Impact Engineering, 1995, 17: 183-194.

[3] Zhang L M, Xiong H P, Chen L D, Hirai T. Microstructures of W−Mo Functionally Graded Material. Journal of Materials Science Letters, 2000, 19(11): 955-958.

[4] Shen Q, Zhang L M, Xiong H P, Hua J S, Tan H. Fabrication of W−Mo−Ti System Flier-Plate with Graded Impedance for Generating Quasi-Isentropic Compression. Chinese Science Bulletin, 2000, 45(15): 1421-1424.

[5] Baker H. Alloy Phase Diagrams, 1992 USA: The Materials Information Society.