液相原位反应法制备Cu-Y2O3复合材料
收稿日期: 2012-06-19
修回日期: 2012-09-18
网络出版日期: 2012-12-11
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
Cu–Y2O3 COMPOSITES PREPARED BY LIQUID PHASE IN SITU REACTION
Received date: 2012-06-19
Revised date: 2012-09-18
Online published: 2012-12-11
Supported by
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)
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
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 . DOI: 10.3724/SP.J.1037.2012.00362
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–0.9Y2O3 composites 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.
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