期刊
MATERIALS & DESIGN
卷 95, 期 -, 页码 237-246出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.01.122
关键词
Cold spraying; Interface bonding; Focused ion beam; Recrystallization
资金
- State Key Lab of Advanced Metals and Materials [2013-ZD07]
- Fundamental Research Funds for the Central Universities [3102014JC02010404]
- 111 Project [B08040]
- Science and Technology Project of Fujian Province [2015H0006]
- Xiamen Science and Technology Project [3502Z20141052]
Cold spraying (CS) deposition depends to a large extent on the particle interface behavior during high velocity impacting, which may involve extensive plastic deformation, recrystallization, and localized melting and resolidification. In this study, commercially pure Cu, Ni and Al powders were used as feedstock to produce Cu/Ni/Al composite coatings with CS. The focused ion beam (FIB) technique was used to characterize the particle interface. In addition, an Eulerian model was developed to study the impacting. Results show that Cu, Ni and Al particles have different impact behaviors during deposition. Although the ratio of Cu, Ni and Al is 1: 1: 1 in the feedstock, their fractions in the composite coating are about 35 vol.%, 17 vol.% and 48 vol.%, respectively. Because of severe deformation, recrystallization, twins and dense dislocations appear in the impacted Cu particles. The detachment of a thin Al layer from the bulk of Al particle at the surrounding contact zone reflects the residual tensile stresses developed near the interface. (C) 2016 Elsevier Ltd. All rights reserved.
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