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2 Materials Science Poland

2 2007

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Grain refinement and mechanical properties of Cu-Al 10%- Fe 4% alloy produced by equal channel angular extrusion

Gao L. L., Cheng X. H.

Materials Science Poland

2007

Vol. 25, No. 4

1119--1126

Equal channel angular extrusion (ECAE) process was carried out for a commercial aliminium bronze alloy (Cu-Al 10%-Fe 4%) produced by hot-rolling at high temperatures. A suitable processing temperature of ECAE for the alloy was determined. The effect of ECAE on microstructural evolution and mechanical properties of the alloy was investigated. Experimental results showed that the extrusion temperature must be higher than the eutectoid reaction temperature of the alloy. Optical electron microscopy and X-ray diffraction (XRD) were used to study the microstructural evolution of the alloy. The results showed that the grains of the alloy were refined after ECAE and gradually reduced with the increase of the pass number; ccordingly, the mechanical properties of the alloy were significantly improved after ECAE.

Effect of lanthanum on the tensile properties of carbon-fibre reinforced thermoplastic polyimide composites

Li J., Cheng X. H.

Materials Science Poland

2007

Vol. 25, No. 1

85--93

Rare earth (RE) La modification and air-oxidation methods were used to improve the interfacial adhesion of the carbon fibre reinforced polyimide (CF/PI) composite. The interfacial characteristics of composites reinforced by carbon fibres, treated with different surface modification methods, were investigated comparatively. Results showed that both RE modification and air-oxidation method improved the adhesion between the reinforcement and matrix, and that the RE modification method was superior to the air-oxidation method. For the CF/PI composite, optimum interfacial adhesion was obtained at 0.3 wt. % of La concentration. The fracture surfaces of samples were investigated by scanning electronic microscopy (SEM) to analyse the effects of various surface treatment methods.