MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ti, C SOLID SOLUTION SUPERSATURATED Al-BASED COMPOSITE FILMS

doi:10.3724/SP.J.1037.2012.00562

Acta Metall Sin

2013, Vol. 49

Issue (3): 320-324 DOI: 10.3724/SP.J.1037.2012.00562

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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ti, C SOLID SOLUTION SUPERSATURATED Al-BASED COMPOSITE FILMS

SHANG Hailong ^{1, 2}, SHEN Jie ¹, YANG Duo ¹, SUN Shiyang ¹, LI Geyang ¹

1）State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240

2）School of Mechanical, Shanghai Dianji University, Shanghai 200245

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SHANG Hailong,SHEN Jie,YANG Duo,SUN Shiyang,LI Geyang. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ti, C SOLID SOLUTION SUPERSATURATED Al-BASED COMPOSITE FILMS. Acta Metall Sin, 2013, 49(3): 320-324.

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Abstract

Alloy films could form substitutionally supersaturated solute solution because of the non-equilibrium characteristics of physical vapor deposition (PVD) and gained grain refining and mechanical properties improving. In order to reveal the structure characteristics and strengthening effect of substitutionally and interstitially supersaturated solid solution films, a series of aluminum-based composite films with different Ti and C contents were synthesized by magnetron co-sputtering Al and TiC targets. EDS, XRD,TEM, STEM and nanoindenter were used to characterize the microstructure and mechanical properties of the composite films. The results showed that Ti and C dissolved in the grains with much higher solute contents than their solubility limits at thermodynamic equilibrium state and enriched at the boundary. The composite film formed “dual-supersaturated solid solution” exhibiting both substitutional and interstitial features. In lower solute contents, the grain size of the composite film decreased to less than 100 nm rapidly because of severe lattice distortion. The hardness of the film increased to 2.1 GPa from pure Al 1.3 GPa when containing 0.6%(Ti, C). With the increase of the solute contents, the film hardness increased gradually and achieved the highest value of 7.0 GPa when containing 6.4%(Ti, C). Then the composite film transformed into amorphous and its hardness also slightly reduced. The study showed significant grain refining and strengthening effects of dual-supersaturation of Ti and C in lower content on aluminum--based film and provided a way to improve the mechanical properties of metal films.

Key words: Al-based composite film microstructure supersaturated solid solution mechanical property magnetron sputtering

Received: 23 September 2012

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00562 OR https://www.ams.org.cn/EN/Y2013/V49/I3/320

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