Mechanical properties of the TaSi2 fibers by nanoindentation

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

• Research Articles • 上一篇下一篇

Mechanical properties of the TaSi2 fibers by nanoindentation

Chunjuan Cui

Northwestern Polytechnical University

收稿日期:2008-11-11 修回日期:2009-08-14 出版日期:2010-01-31 发布日期:2010-01-22
通讯作者: Chunjuan Cui
基金资助:
国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金

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)

摘要/Abstract

摘要：

当凝固速率在0.3~9.0mm/min范围之内均可通过定向凝固技术获得在硅基体中均匀分布且定向排列的Si-TaSi2共晶自生复合材料。非常有趣的是在凝固速率为6.0mm/min时出现了一两个弯曲的纤维，通常这种纤维是非常脆的。首先讨论了弯曲纤维的形成机理。采用纳米压痕技术测试了弯曲纤维和直纤维的力学性能。研究表明，弯曲TaSi2纤维的硬度和弹性模量均大于直TaSi2纤维的硬度和弹性模量。此外，本文讨论了弯曲纤维和直纤维的力学性能力学性能差异的原因。这主要是由于两相的热膨胀系数的差异和不同的晶体学方向所导致的。

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. Mechanical properties of the TaSi2 fibers by nanoindentation[J]. J. Mater. Sci. Technol., 2010, 26(1): 65-68.

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.

参考文献

[1 ] F. Chu, M. Lei, S.A. Maloy, J.J. Petrovic and T.E. Mitchell: Acta Mater., 1996, 44, 3035.
[2 ] F. Maglia, C. Milanese, U. Anselmi-Tamburin, S. Doppiu, G. Cocco and Z.A. Munir: J. Alloy. Compd., 2004, 385, 269.
[3 ] W.D. Liu and E.Z. Luo: Semicond. Technol., 1994, 4(2), 1. (in Chinese)
[4 ] B.M. Ditchek and M. Levinson: Appl. Phys. Lett., 1986, 49, 1656.
[5 ] B.M. Ditchek, J. Hefter and T.R. Middleton: J. Cryst. Growth, 1990, 102, 401.
[6 ] C.J. Cui, J. Zhang, B. Li, M. Han, L. Liu and H.Z. Fu: J. Cryst. Growth, 2007, 299, 248.
[7 ] J.M. Lackner, W. Waldhauser, R. Berghauser, R. Ebner, B. Major and T. SchÄoberl: Thin Solid Films, 2004, 453, 195.
[8 ] H. Bei and E.P. George: Acta Mater., 2005, 53, 69.
[9 ] J.J. Hughesa and P. Trtik: Mater. Charact., 2004, 53, 223.
[10] C.J. Cui, J. Zhang, Z.W. Jia, H.J. Su, L. Liu and H.Z.v Fu: J. Cryst. Growth, 2008, 310, 71.
[11] M.Y. Liu, J.H. Liu and S.J. Zhang: Semiconductor Optoelectronics, 2000, 21, 132. (in Chinese)
[12] R.M.A. Fatah: Sensors Actuators, 1992, A33, 229.
[13] I. Engstrom and B. Lonnberg: J. Appl. Phys., 1998, 63, 4476.
[14] Y.H. Liu: J. Civil Avi. Uni. China, 2001, 19, 39. (in Chinese)
[15] S.P. Simner, P. Xiao and B. Derby: J. Mater. Sci., 1998, 33, 5557.
[16] W.C. Oliver and G.M. Pharr: J. Mater. Res., 1992, 7, 1564.
[17] K. Mohan Kumar, V. Kripesh, L. Shen, K.Y. Zeng and A.O.T. Andrew: Mater. Sci. Eng A, 2006, 423, 57.
[18] C.M. Chan, G.Z. Cao, H. Fong and M. Sarikaya: J. Mater. Res., 2000, 15, 148.
[19] F. Songa, K.W. Xiao, K. Baib and Y.L. Bai: Mater. Sci. Eng. A, 2007, 457, 254.
[20] R. Saha and J.A. Barnard: J. Cryst. Growth, 1997, 174, 495.
[21] A.C. Raghuram and R.F. Bunshah: J. Vac. Sci. Technol., 1972, 9, 1389.
[22] P. Delobelle, G.S. Wang, E. Fribourg-Blanc and D. Remiens: Surf. Coat. Technol., 2006, 201, 3155.
[23] C.J. Cui: Microstructure and Property of Si-TaSi₂ Eutectic in situ Composite for Field Emission, Master Dissertation, Northwestern Polytechnical University,
Xi0an, China, 2005. (in Chinese)

Mechanical properties of the TaSi2 fibers by nanoindentation

Mechanical Properties of the TaSi₂ Fibers by Nanoindentation

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 0

编辑推荐

Metrics

本文评价

Mechanical properties of the TaSi2 fibers by nanoindentation

Mechanical Properties of the TaSi2 Fibers by Nanoindentation

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 0

编辑推荐

Metrics

本文评价

Mechanical Properties of the TaSi₂ Fibers by Nanoindentation