High-temperature stability of Ni-3 wt.% SiCNP composite and the effect of milling time
High-temperature stability of Ni-3 wt.% SiCNP composite and the effect of milling time
复制标题
DOI：
10.1016/j.jnucmat.2015.10.044
复制
发表时间：
2015-12-01
影响因子：
3.1
通讯作者：
Zhang, Deliang
中科院分区：
文献类型：
--
作者：
Yang, Chao;Huang, Hefei;Zhang, Deliang
研究了镍-碳化硅纳米颗粒（Ni-3 wt.% SiCNP）复合材料的球磨时间为8 ~ 48 h。研究了高温老化样品和参比样品，以阐明其高温稳定性。TEM表征结果表明，随着球磨时间的延长，分散SiCNP发生粗化，而在不同的老化温度下，其尺寸保持稳定。EBSD结果表明，随着球磨时间的延长和时效温度的升高，平均晶粒尺寸分别减小和增大。两种不同的再结晶机制，边界弯曲和亚晶生长，被认为是负责晶粒长大。拉伸试验结果表明，参考样品和老化样品的屈服强度和拉伸强度均随着研磨时间的增加而增加。随着球磨时间的延长，参考试样的总延伸率逐渐降低，而老化试样的总延伸率则先略有降低后又有所增加。研究了显微组织演变与拉伸性能变化之间的关系。(C)2015爱思唯尔B. V.保留所有权利。
The microstructural evolution and tensile properties of nickel-silicon carbide nano-particles (Ni-3wt.% SiCNP) composites with milling time ranged from 8 to 48 h have been examined. High temperature aged and reference samples were investigated to clarify their high temperature stability. The TEM characterizations showed that the coarsening of dispersed SiCNP occurred with increasing milling time, whereas their sizes kept stable under different aging temperatures. The EBSD results indicated that the mean grain size decreased and increased respectively with increasing milling time and aging temperature. Two different recrystallization mechanisms, boundary bowing out and subgrain growth, were assumed to be responsible for the grain growth. The tensile test results showed that both the yield and tensile strengths of reference and aged samples increased as a function of the milling time. As milling time extended, the total elongations gradually decreased in the case of reference samples, but slightly decreased firstly and then increased in the case of the aged ones. The relationship between the microstructural evolution and the variations of tensile properties has been discussed in this study. (C) 2015 Elsevier B.V. All rights reserved.