鋁單晶之尺寸效應以及塑性變形機制

吳若涵

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鋁單晶之尺寸效應以及塑性變形機制

The sample size effect and deformation mechanism of single crystal aluminum

吳若涵 , Masters　　Advisor：黃志青　　

英文

拉伸測試；壓縮測試；尺寸效應；塑性變形；鋁單晶； Size effect ； Compression test ； Plastic deformation ； Single crystal aluminum ； Tension test

Abstract │ Reference (126) │ Altmetrics

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Over recent years, the important issue of nano-technology is the size effect of the materials in nano-scaled. And the nano-scaled materials possess the unique mechanical properties compared to the large size materials. The size effect is not only applied for nanocrystalline materials but also for nano-structured single crystals. The size effect of strength in accordance with the Hall-Petch relationship has been studied. The strength of a single crystal will increase with decreasing sample size to the nano-scaled.

Among various metallic elements with a face centered cubic (FCC) structure, aluminum (Al) is selected in this study due to its low cost and many excellent physical and chemical properties. In addition, aluminum possesses lower twin boundary energy, higher specific strength and higher stacking fault energy.

In this study, the mechanical properties and deformation behaviors of single crystal aluminum with different sizes and loading directions have been investigated via different tension and compression tests. The yield stress for the mini-scaled tension, micro-scaled compression and nano-scaled tension testing loading along [111] direction are 60 MPa, 180 MPa and 0.75 GPa, respectively. The yield stress for the micro-scaled compression testing loading along [110] direction is 116 MPa. The size effect and the orientation effect of the single crystal aluminum were revealed and rationalized.

Reference ( 126 ) 〈TOP〉

[1] K. Kumar, H. Van Swygenhoven, S. Suresh, Acta Materialia, 51 (2003) 5743-5774.
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[5] D. Kiener, W. Grosinger, G. Dehm, R. Pippan, Acta Materialia, 56 (2008) 580-592.
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[7] T.A. Parthasarathy, S.I. Rao, D.M. Dimiduk, M.D. Uchic, D.R. Trinkle, Scripta Materialia, 56 (2007) 313-316.
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[14] W. Witt, Z Naturforsch Pt A, A 22 (1967) 92-&.
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[16] W.D. Callister, John Wiley and Son, (2000).
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