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| Microstructures and mechanical properties of (Ti, N)/Al nanocomposite films by magnetron sputtering |
| Yang Duo1, Zhong Ning2, Shang Hai-Long1, Sun Shi-Yang1, Li Ge-Yang1 |
1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, China |
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Abstract A series of aluminum matrix nanocomposite films are synthesized by magnetron sputtering of Al and TiN targets. The composition, microstructure and mechanical property of the composite film are characterized by energy dispersive spectroscopic, X-ray diffraction, transmission electron microscope and nanoindenter. The influences of (Ti, N) content of supersaturated solute Ti,N atoms on the microstructure and mechanical property of the composite films are investigated. The results reveal that the composite film with adding Ti,N atoms together forms a dual-supersaturated solid solution exhibiting both features of substitutional and interstitial solid solution. Higher solute content induced gradual evolutions of nanocrystallization and amorphization of grains in film and solute enrichment occured at the grain boundaries. Correspondingly, the composite film containing 1.8 at.% (Ti, N) can rapidly reach a hardness of 3.9 GPa, and further increasing TiN content to 17.1 at% (Ti, N) the film hardness achieves 8.8 GPa demonstrating the significant strengthening effect of dual-supersaturation of Ti and N on aluminum film.
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Received: 02 July 2012
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| Fund:Project supported by State Key Development Program for Basic Research of China (Grant No. 2012CB619601) and the National Natural Science Foundation of China (Grant No. 51071104). |
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Corresponding Authors:
李戈扬
E-mail: gyli@sjtu.edu.cn
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2013, Vol. 62 
