Effect of CuO Particle Size on the Microstructure Evolution of Al2O3P/Al Composites Prepared Via Displacement Reactions in the Al/CuO System

doi:10.1007/s40195-015-0250-8

金属学报英文版 ›› 2015, Vol. 28 ›› Issue (6): 699-706.DOI: 10.1007/s40195-015-0250-8

收稿日期:2014-08-23 修回日期:2015-01-14 出版日期:2015-03-17 发布日期:2015-07-23

Effect of CuO Particle Size on the Microstructure Evolution of Al₂O_3P/Al Composites Prepared Via Displacement Reactions in the Al/CuO System

Ge Zhao¹(), Zhi-Ming Shi¹, Rui-Ying Zhang¹

(1) School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

Received:2014-08-23 Revised:2015-01-14 Online:2015-03-17 Published:2015-07-23

摘要/Abstract

Abstract:

An Al₂O_3P/Al composite was successfully synthesized using a displacement reaction between 80 wt% Al and 20 wt% CuO powders at a heating rate of 5 °C/min. Two different sizes CuO particles were used, and all the experiments were conducted under an argon atmosphere. To analyze the microstructural evolution during synthesis, the Al-20 wt% CuO samples were heated to the temperatures selected according to the differential scanning calorimetry curve and then immediately quenched with water. The phase composites and microstructure of the water-quenching samples were investigated using X-ray diffraction, optical microscopy, scanning electron microscopy and energy-dispersive spectrometry. The results indicate that the CuO particle size has a significant effect on the microstructural evolution of the samples during the heating stage and on the microstructure of synthesized composites. Smaller CuO particles can decrease the reaction temperature, narrow the reaction temperature range at the different reaction stages during the heating stage and make the size and distribution of in situ Al₂O₃ particles more uniform. The reaction between Al and CuO can be complete as the temperature rises to 900 °C. The size of the in situ Al₂O₃ particles is approximately 5 μm when the size of the CuO particles is less than 6 μm. This sample has a relatively high Rockwell hardness of 60 HRB.

Key words: Al2O3P/Al, composite, Displacement, reaction, CuO, particles, Particle, size, Microstructure, evolution

. [J]. 金属学报英文版, 2015, 28(6): 699-706.

Ge Zhao, Zhi-Ming Shi, Rui-Ying Zhang. Effect of CuO Particle Size on the Microstructure Evolution of Al₂O_3P/Al Composites Prepared Via Displacement Reactions in the Al/CuO System[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(6): 699-706.

图/表 10

Fig. 1 DSC curves of the CuO I and CuO II samples at a heating rate of 5 °C/min

Fig. 2 Phase analysis of the green sample and evolution of the phases in the samples heated at different temperatures and then immediately water quenched: a green sample; b-e XRD results for the CuO I sample heated at 620, 710, 790 and 900 °C, respectively; f CuO II sample heated at 900 °C

Table 1 Lattice parameters of the Al (0.1 nm) in the matrix of the Al-20 wt% CuO samples heated to different temperature [a = 0.40497 nm for pure A Ref. Swanson, Tatge, Natl. Bur. Stand. (U.S.), Circ. 539, 1, 11 (1953)]

Temperature	Green sample	620 °C	710 °C	740 °C	790 °C	900 °C
CuO I	4.05375	4.053504	4.05327		4.04407	4.04423
CuO II	4.05375	4.05287		4.05300		4.04883

Fig. 3 SEM images of the CuO I a and CuO II b green samples. The corresponding size of the CuO particles is less than approximately 6 and 50 μm. c Optical micrograph of the Al matrix formed by the Al particles

Fig. 4 SEM images of the CuO I sample heated at 620 °C a, 710 °C b, 790 °C c and 900 °C at different magnifications d, e

Fig. 5 EDS analysis of the CuO I sample heated to 710 °C, the EDS spectrum and element distribution are from the bright point in the dark patch in the image

Fig. 6 SEM images of the CuO II sample heated at 620 °C a, 740 °C b and 900 °C at different magnifications c, d

Fig. 7 SEM images of the CuO I sample sintered at 900 °C for 1 h at different magnifications a, b

Fig. 8 SEM images of the CuO II sample sintered at 900 °C for 1 h at different magnifications a, b

Fig. 9 HRB of the samples heated at 5 °C/min

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Effect of CuO Particle Size on the Microstructure Evolution of Al₂O_3P/Al Composites Prepared Via Displacement Reactions in the Al/CuO System

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