Combined volumetric, energetic and microstructural defect analysis of ECAP-processed nickel
Combined volumetric, energetic and microstructural defect analysis of ECAP-processed nickel
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DOI：
10.1016/j.actamat.2015.10.004
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发表时间：
2015-10
期刊：
影响因子：
9.4
通讯作者：
G. Reglitz;B. Oberdorfer;Nina Fleischmann;J. Kotzurek;S. Divinski;W. Sprengel;G. Wilde;Roland Wurschum
中科院分区：
文献类型：
--
作者：
G. Reglitz;B. Oberdorfer;Nina Fleischmann;J. Kotzurek;S. Divinski;W. Sprengel;G. Wilde;Roland Wurschum
采用差示扫描量热法（DSC）和差示扫描量热法（DSC）研究了不同温度下等径角挤压（ECAP）超细晶镍的缺陷退火过程。可以检测不同的缺陷类型和过程，例如空位、位错、晶界和晶界弛豫。它们可以由于其独特的动力学而被区分，如在线性加热期间释放过量体积和过量热量所揭示的。结合微观结构的详细表征对数据进行量化。导出了ECAP处理镍中空位浓度、位错密度、晶界膨胀和晶界膨胀过量的数值。
Difference dilatometry and differential scanning calorimetry (DSC) are used to investigate defect annealing in ultrafine grained nickel processed by equal channel angular pressing (ECAP) at various temperatures. Different defect types and processes such as vacancies, dislocations, grain boundaries and grain-boundary relaxation can be detected. They can be distinguished due to their distinct kinetics as revealed by the release of excess volume and excess heat during linear heating. The data are quantified in combination with a detailed characterization of the microstructure. Values for the absolute vacancy concentration, the dislocation density, the grain boundary expansion and the excess of grain boundary expansion in ECAP-processed nickel are derived.