Consolidation of AA 7075-2 wt% ZrO2 Composite Powders by Severe Plastic Deformation via ECAP

doi:10.1007/s40195-016-0477-z

Acta Metallurgica Sinica (English Letters) ›› 2016, Vol. 29 ›› Issue (10): 895-895.DOI: 10.1007/s40195-016-0477-z

Special Issue: 2016复合材料专辑

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Consolidation of AA 7075-2 wt% ZrO₂ Composite Powders by Severe Plastic Deformation via ECAP

S. E. Hernández-Martínez¹(),J. J. Cruz-Rivera¹,R. Martínez-Sánchez²,C. G. Garay-Reyes²,J. A. Mu?oz-Bola?os³,J. M. Cabrera^3,⁴,J. L. Hernández-Rivera⁵

1 Instituto de Metalurgia, Universidad Auto′noma de San Luis Potos?′, Sierra Leona 550, 78210 San Luis Potos?′, Mexico
2 Centro de Investigacio′n en Materiales Avanzados (CIMAV), Miguel de Cervantes 120, 31109 Chihuahua, Mexico
3 Departamento de Ciencia de Materiales e Ingenier?′a Metalu′rgica, Universitat Polite`cnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain
4 Fundacio′n CTM Centro Tecnolo′gico, Plaza de la Ciencia 2,08243 Manresa, Spain
5 CONACYT Research Fellow-Instituto de Metalurgia, Universidad Auto′noma de San Luis Potos?′-, Sierra Leona 550, 78210 San Luis Potos?′, Mexico;

Received:2016-01-22 Online:2016-10-10 Published:2016-11-08

Abstract

Abstract:

The powders of the AA 7075-ZrO₂ were mixed by mechanical milling, but it was found that the system presents a few disadvantages when processed by conventional sintering and hot extrusion, since intermetallic phases between ZrO₂ particles and alloying elements were formed. Equal channel angular pressing (ECAP) processing was proposed as an alternative method to consolidate the composite where there is no intermetallic formation. The analysis of the ECAP process showed that the intermediate temperature (220 °C) produced a higher consolidation level than conventional sintering and hot extrusion (400 and 500 °C, respectively). This fact was supported by relative density analysis. In the case of the sintered and hot-extruded sample, the relative density exhibited a value of 0.95, while ECAP sample showed a value of 0.98. Hardness values show that microstructural refinement obtained during mechanical milling was preserved during ECAP processing even when it was carried out at 220 °C.

Key words: Metal matrix composites (MMCs), Powder consolidation, Severe plastic deformation (SPD)

S. E. Hernández-Martínez,J. J. Cruz-Rivera,R. Martínez-Sánchez,C. G. Garay-Reyes,J. A. Mu?oz-Bola?os,J. M. Cabrera,J. L. Hernández-Rivera. Consolidation of AA 7075-2 wt% ZrO₂ Composite Powders by Severe Plastic Deformation via ECAP[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(10): 895-895.

Figures/Tables 12

Fig. 1 Load-displacement curves of the AA 7075-2 wt% ZrO2 consolidation process by single ECAP pass

Fig. 2 SEM micrographs of AA 7075-2 wt% ZrO2 composite a and c consolidated by three ECAP passes at room temperature, and b and d consolidated by a single ECAP pass at 220 °C

Fig. 3 TEM micrographs of the AA 7075-2 wt% ZrO2 mechanically milled and consolidated by ECAP at 220 °C

Fig. 4 Variation of hardness with aging time for commercial bulk AA 7075 [24] and the AA 7075-2 wt% ZrO2 composite by sintering and hot extrusion

Fig. 5 X-ray diffraction patterns of AA 7075-2 wt% ZrO2 composite powder in the as milled condition and after sintering and hot extrusion condition

Fig. 6 XRD patterns of 7075-2 wt% ZrO2 composite processed by sintering and hot extrusion and single pass ECAP at 220 °C: a from 37° to 40° in 2θ (deg.) and b from 76° to 84° in 2θ (deg.)

Fig. 7 DSC thermograms of the powders of the mechanically milled AA 7075 powders, and the powders of the AA 7075-2 wt% ZrO2 composite

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Consolidation of AA 7075-2 wt% ZrO₂ Composite Powders by Severe Plastic Deformation via ECAP

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