Influence of chemical disorder on energy dissipation and defect evolution in advanced alloys
Influence of chemical disorder on energy dissipation and defect evolution in advanced alloys
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DOI：
10.1557/jmr.2016.269
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发表时间：
2016-08
影响因子：
2.7
通讯作者：
Yanwen Zhang;K. Jin;H. Xue;Chenyang Lu;R. Olsen;L. Béland;M. W. Ullah;Shijun Zhao;H. Bei;D. Aidhy;G. Samolyuk;Luming Wang;M. Caro;A. Caro;G. M. Stocks;B. C. Larson;I. Robertson;A. Correa;W. J. Weber
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文献类型：
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作者：
Yanwen Zhang;K. Jin;H. Xue;Chenyang Lu;R. Olsen;L. Béland;M. W. Ullah;Shijun Zhao;H. Bei;D. Aidhy;G. Samolyuk;Luming Wang;M. Caro;A. Caro;G. M. Stocks;B. C. Larson;I. Robertson;A. Correa;W. J. Weber
从历史上看，具有更好辐射性能的合金开发一直集中在具有一种或两种主要元素和次要合金元素的传统合金上，其中增强的抗辐射性取决于微观结构或纳米级特征以减轻位移损伤。与传统合金形成鲜明对比的是，单相浓固溶体合金（SP-CSA）的最新进展开辟了材料研究的新领域。在这些合金中，晶格上多种元素的随机排列导致无序的局部化学环境和独特的位点晶格畸变。基于使用面心立方结构中的一组新型 SP-CSA 进行的紧密集成的计算和实验研究，我们明确证明，增加化学无序性可以导致电子平均自由程以及电导率和导热率大幅减少，从而导致 SP-CSA 的散热速度减慢。化学无序对离子辐照下的缺陷演化也有显着影响。随着电子和原子水平上化学无序性的增加，观察到耐辐射性的显着改善。对缺陷动力学的深入了解可以为理解辐照材料中辐射损伤演化的元素影响提供基础，并可能激发先进能源系统耐辐射结构合金的新设计原理。
Historically, alloy development with better radiation performance has been focused on traditional alloys with one or two principal element(s) and minor alloying elements, where enhanced radiation resistance depends on microstructural or nanoscale features to mitigate displacement damage. In sharp contrast to traditional alloys, recent advances of single-phase concentrated solid solution alloys (SP-CSAs) have opened up new frontiers in materials research. In these alloys, a random arrangement of multiple elemental species on a crystalline lattice results in disordered local chemical environments and unique site-to-site lattice distortions. Based on closely integrated computational and experimental studies using a novel set of SP-CSAs in a face-centered cubic structure, we have explicitly demonstrated that increasing chemical disorder can lead to a substantial reduction in electron mean free paths, as well as electrical and thermal conductivity, which results in slower heat dissipation in SP-CSAs. The chemical disorder also has a significant impact on defect evolution under ion irradiation. Considerable improvement in radiation resistance is observed with increasing chemical disorder at electronic and atomic levels. The insights into defect dynamics may provide a basis for understanding elemental effects on evolution of radiation damage in irradiated materials and may inspire new design principles of radiation-tolerant structural alloys for advanced energy systems.