Mechanical Properties of the TaSi2 Fibers by Nanoindentation

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (1): 65-68.

• Nanomaterialsand Nanotechnology • Previous Articles Next Articles

Mechanical Properties of the TaSi₂ Fibers by Nanoindentation

Chunjuan Cui, Jun Zhang, Lin Liu, Hengzhi Fu

1) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
2) School of Metallurgical Engineering, Xi0an University of Architecture and Technology, Xi'an 710055, China

Received:2008-11-11 Revised:2009-08-14 Online:2010-01-31 Published:2010-01-22
Contact: Chunjuan Cui
Supported by:
the National Natural Science Foundation of China (No. 50102004) and the Aeronautical Science Foundation of China (No. 04G53048),
the Development Program for Outstanding Persons in NPU and the Science Plane Project of Xi0an University of Architecture and Technology (projects for talent persons
RC0907),
the fund of the stale Key Laboratory of Solidification Processing in NWPU (SKLSP200904),
the Education Commission of Shanxi Province of China (095K511)
and the Doctoral fund of Ministry of Education of China (20096120120017)

Abstract

Abstract:

The Si-TaSi₂ eutectic in situ composite, which has highly-aligned and uniformly-distributed TaSi₂ fibers in the Si matrix, can be obtained when the solidification rate changes from 0.3 to 9.0 mm/min. It is very interesting that one or two TaSi₂ fibers are curved when the solidification rate reaches 6.0 mm/min, although it is very brittle in general. The formation mechanism of the curved fiber is discussed and mechanical properties of the TaSi₂ fibers are examined by nanoindentation. It is found that the hardness and the elastic modulus of the bended TaSi₂ fiber are much higher than that of the straight TaSi₂ fiber. Moreover, the reasons why the mechanical properties of the straight TaSi₂ fiber are different from that of the curved TaSi₂ fiber are discussed. This can be ascribed to internal stress which results from mismatch of the thermal expansion coefficients of the two phases and di®erent crystallographic orientations.

Key words: Si-TaSi₂ eutectic in situ composite, Directional solidification, Mechanical properties, Nanoindentation

Chunjuan Cui Jun Zhang Lin Liu Hengzhi Fu. Mechanical Properties of the TaSi₂ Fibers by Nanoindentation[J]. J Mater Sci Technol, 2010, 26(1): 65-68.

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Mechanical Properties of the TaSi₂ Fibers by Nanoindentation

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