Contrasting roles of Laves_Cr2Nb precipitates on the creep properties of novel CuCrNbZr alloys

Ling Wang; Ce Zheng; Boopathy Kombaiah; Lizhen Tan; David J. Sprousterd; Lance L. Snead; Steven J. Zinkle; Ying Yang

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Contrasting roles of Laves_Cr2Nb precipitates on the creep properties of novel CuCrNbZr alloys

机译：Laves_Cr2Nb析出物对新型CuCrNbZr合金蠕变性能的反作用

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To enhance the creep resistance at elevated temperatures, a new precipitation-strengthened CuCrNbZr alloy has been designed and fabricated to achieve a target microstructure with coarse Laves_Cr2Nb precipitates at grain boundaries and fine Cr-rich precipitates in the matrix. This work systematically studied the creep property of the CuCrNbZr alloy at 500 ℃ under 90-140 MPa applied stress and compared to that of a reference commercial CuCrZr alloy without Laves_Cr2Nb precipitates. Microstructures before and after creep testing were investigated by optical and transmission electron microscopy. Based on the creep testing and microstructural characterization results, the dominant creep mechanism in both alloys was grain boundary sliding with a threshold stress of -80 MPa. The CuCrNbZr alloy has higher creep strength and higher creep fracture ductility, and longer creep life than the CuCrZr alloy. The improved creep property in the CuCrNbZr alloy was due to the presence of Laves.Cr2Nb precipitates that efficiently impede the crack propagation.

机译：为了提高在高温下的抗蠕变性，已经设计并制造了一种新的沉淀强化的CuCrNbZr合金，以实现目标微观结构，其中在晶界处有粗糙的Laves_Cr2Nb析出物，在基体中有细的富Cr析出物。这项工作系统地研究了CuCrNbZr合金在90-140 MPa外加应力下在500℃下的蠕变性能，并与没有Laves_Cr2Nb沉淀的参考商品CuCrZr合金进行了比较。通过光学和透射电子显微镜研究蠕变测试前后的微观结构。根据蠕变测试和微观结构表征结果，两种合金中主要的蠕变机理是晶界滑动，阈值应力为-80 MPa。与CuCrZr合金相比，CuCrNbZr合金具有更高的蠕变强度和更高的蠕变断裂延展性，以及更长的蠕变寿命。 CuCrNbZr合金的蠕变性能得到改善是由于存在Laves.Cr2Nb沉淀物有效地阻碍了裂纹的扩展。

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来源
《Materials Science and Engineering》 |2020年第27期|139110.1-139110.10|共10页
作者
Ling Wang; Ce Zheng; Boopathy Kombaiah; Lizhen Tan; David J. Sprousterd; Lance L. Snead; Steven J. Zinkle; Ying Yang;
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作者单位

Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996-2100 USA;

Department of Nuclear Engineering North Carolina State University Raleigh NC 27695 USA;

Oak Ridge National Laboratory Oak Ridge TN 37831 USA;

Department of Materials Science and Chemical Engineering Stony Brook University Stony brook New York 11784 USA;

Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996-2100 USA Oak Ridge National Laboratory Oak Ridge TN 37831 USA Department of Nuclear Engineering University of Tennessee Knoxville TN 37996-2100 USA;

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Precipitate-strengthened Cu alloy; Laves_Cr2Nb precipitates; Creep Microstructural characterizations;

机译：沉淀强化的Cu合金;Laves_Cr2Nb沉淀;蠕变微结构表征;

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Contrasting roles of Laves_Cr2Nb precipitates on the creep properties of novel CuCrNbZr alloys

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