Cu–Y2O3 COMPOSITES PREPARED BY LIQUID PHASE IN SITU REACTION

doi:10.3724/SP.J.1037.2012.00362

Acta Metall Sin

2012, Vol. 48

Issue (12): 1474-1478 DOI: 10.3724/SP.J.1037.2012.00362

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Cu–Y₂O₃ COMPOSITES PREPARED BY LIQUID PHASE IN SITU REACTION

ZHUO Haiou, TANG Jiancheng, YE Nan

Institute of Materials Science and Engineering, Nanchang University, Nanchang 330031

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ZHUO Haiou TANG Jiancheng YE Nan. Cu–Y₂O₃ COMPOSITES PREPARED BY LIQUID PHASE IN SITU REACTION. Acta Metall Sin, 2012, 48(12): 1474-1478.

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Abstract

A growing trend to use new oxide dispersion strengthened (ODS) copper–based composites is observed recently world–wide. Yttria (Y₂O₃) and most rare earth oxides are potentially attractive as dispersiods for copper–based composites owing to their thermodynamic stability. Cu–0.9Y₂O₃ (volume fraction, %) composites were prepared with Cu–0.4Y (mass fraction, %) alloy by in situ reaction at liquidus temperature. The objective of the work was to investigatechanges in structure and strengthening mechanism of Cu–Y₂O₃ composites. TEM observation and SAD analysis of the composites indicate that the obtained Y₂O₃ nano–particles are uniformly distributed in copper matrix, their mean size and space between particles are 5.0 nm and 20 nm, respectively, and the cubic Y₂O₃ phase is coherent with copper matrix, which indicated (422)Y₂O₃//(111)_Cu and [011]Y₂O₃//[112]_Cu orientation relationship. The strengthening mechanism of the composites is analyzed and explained in three aspects: matrix strengthening, fine particles strengthening according to the Orowan model and shear model. The tensile strength of Cu–0.9Y₂O₃composites is 568 MPa, which is strengthened by both Orowan mechanism and shear mechanism, the strength value added by Orowan mechanism and shear mechanism can be calculated to be 185 and 195 MPa, respectively.

Key words: liquid phase in situ reaction Cu–Y₂O₃ composite coherent relationship strengthening mechanism

Received: 19 June 2012

Fund:

Supported by National Natural Science Foundation of China (Nos.50801037, 51071082 and 51271090), Program for Changjiang Scholars and Innovative Research Team in University (No.IRT0730), New Century Excellent Talents in University (No.NCET–10–0184) and Specialized Research Fund for the Doctoral Program of Higher Education (No.20103601110001)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00362 OR https://www.ams.org.cn/EN/Y2012/V48/I12/1474

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