Consolidation of Cu based amorphous powder by hot pressing method

Abstract

Amorphous Cu₅₀Zr₄₀Ti₁₀ powder was fabricated in the particle size range <50 μm by gas atomisation method. Gas atomised Cu₅₀Zr₄₀Ti₁₀ amorphous powder exhibits the glass transition temperature T_g of 629·5 K and the crystallisation temperature T_x of 693·2 K respectively. The gas atomised Cu₅₀Zr₄₀Ti₁₀ amorphous powder possesses a high supercooled liquid region ΔT_x of 63·7 K suitable for being hot pressed. In addition, the Cu₅₀Zr₄₀Ti₁₀ amorphous powders were consolidated by hot pressing method based on an L₉(3⁴) orthogonal design. The optimum consolidation condition for the Cu₅₀Zr₄₀Ti₁₀ amorphous powder is first precompacted under the pressure of 75 MPa, and then consolidated under the pressure of 450 MPa at the temperature of 380°C respectively. The significance of three factors is examined by the analysis of variance for the density and thermal conductivity respectively. The effect of three factors on the density and thermal conductivity is also discussed.

Keywords:

• Consolidation
• Cu based alloy
• Amorphous powder
• Hot pressing
• Orthogonal test
• Gas atomisation

The authors acknowledge the support of the National Natural Science Foundation (grant no. 50874045), the Postdoctoral Science Foundation of China (grant nos. 200902472, 20080431021) and the Scientific Research Fund of the Hunan Provincial Education Department (grant no. 10A044).