液相原位反应法制备Cu-Y<sub>2</sub>O<sub>3</sub>复合材料

doi:10.3724/SP.J.1037.2012.00362

金属学报

2012, Vol. 48

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

论文

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液相原位反应法制备Cu-Y₂O₃复合材料

卓海鸥,唐建成,叶楠

南昌大学材料科学与工程学院, 南昌 330031

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

引用本文:

卓海鸥唐建成叶楠. 液相原位反应法制备Cu-Y₂O₃复合材料[J]. 金属学报, 2012, 48(12): 1474-1478.
ZHUO Haiou TANG Jiancheng YE Nan. Cu–Y₂O₃ COMPOSITES PREPARED BY LIQUID PHASE IN SITU REACTION[J]. Acta Metall Sin, 2012, 48(12): 1474-1478.

全文: PDF(890 KB)

摘要:

采用液相原位反应法制备了Cu-0.9Y₂O₃(体积分数, %)复合材料. TEM观察与SAD分析表明: Cu基体上均匀分布着纳米Y₂O₃颗粒, 其平均尺寸和颗粒间距分别为5.0和20 nm,Y₂O₃颗粒与基体共格, 晶面(422)Y₂O₃//(111)_Cu,晶带轴[011]Y₂O₃//[112] _Cu. 实验结果表明,Cu--0.9Y₂O₃复合材料的抗拉强度为568 MPa, 其强化机制为Orowan机制和切割机制共同作用, 其中Orowan机制产生的强度增值为185 MPa, 切割机制引起强度增加195 MPa.

关键词 ：液相原位反应, Cu-Y₂O₃复合材料, 共格, 强化机制

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

收稿日期: 2012-06-19

基金资助:

国家自然科学基金项目50801037, 51071082和51271090, 教育部长江学者和创新团队发展计划项目IRT0730, 教育部新世纪优秀人才支持计划项目CET-10-0184, 以及高等学校博士学科点专项基金项目20103601110001资助

作者简介: 卓海鸥, 男, 1988年生, 博士生

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

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