期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.01.048
关键词
Metallic multilayers; Thermal stability; Heterogeneous interface; Grain growth
类别
资金
- National Natural Science Foundation of China [51371096, 51671103, 51171078]
- Natural Science Foundation of Jiangsu Province [20141234]
- Jiangsu Public Technology Service Platform for New Functional Materials [BM2016019]
The annealing induced grain growth (GG) and heterogeneous interface evolution of Cu/Ag multilayers with individual layer thickness (h) varying from 5 to 50 nm were investigated by transmission electron microscopy (TEM). The results demonstrate that the thermal stability of Cu/Ag multilayers exhibits strong length scale dependence. For samples with h < 20 nm, the heterogeneous interfaces completely disappear when the annealing temperature exceeds 200 degrees C. However, the temperature for stable layered structure can reach 300 degrees C as the ha >= 20 nm, where the interfaces remain remarkably intact. The existence of a large number of grain boundaries (GBs) decrease the stability of multilayers, while more heterogeneous interfaces contribute to resisting atomic diffusion, inhibiting GG. The equilibrium is achieved by a competitive process between GBs diffusion and heterogeneous interfaces resistance. Moreover, the formation of annealing twins in multilayer also significantly improve the microstructural stability.
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