Electron Back-Scattered Diffraction and Nanoindentation Analysis of Nanostructured Al Tubes Processed by Multipass Tubular-Channel Angular Pressing

다국어 초록 (Multilingual Abstract)

Microstructural evolution and mechanical properties of nanostructured 1060 aluminum alloy tubes processed by tubular-channel angular pressing (TCAP) process were investigated using electron back-scattered diffraction (EBSD), transmission electron microscopy (TEM) and nanoindentation analyzes. EBSD scans revealed a homogeneous ultrafine grained microstructure after the third passes of the TCAP process. Apart from that the mean grain sizes of the TCAP processed tubes were refined to 566 nm, 500 nm and 480 nm respectively after the first, second and third passes. The results showed that after the three TCAP passes, the grain boundaries with a high angle comprised 78% of all the boundaries. This is in comparison to the first pass processed sample that includes approximately 20% HAGBs. The TEM inspection afforded an appreciation of the role of very low-angle misorientation boundaries in the process of refining microstructure. Nanoindentation results showed that hardness was the smallest form of an unprocessed sample while the largest form of the processed sample after the three passes of TCAP indicated the highest resistant of the material. In addition, the module of elasticity of the TCAP processed samples was greater from that of the unprocessed sample.

참고문헌 (Reference)

1 M. Kawasaki, 524 : 143-, 2009

2 Y. T. Zhu, 51 : 825-, 2004

3 M. Reihanian, 473 : 189-, 2008

4 A. Babaei, 558 : 150-, 2012

5 D. Yadav, 539 : 85-, 2012

6 M. Arzaghi, 60 : 4393-, 2012

7 G. Faraji, 65 : 3009-, 2011

8 A. S. Mohammadi, 15 : 126-, 2015

9 G. Faraji, 30 : 134-, 2014

10 M. Mesbah, 590 : 289-, 2014

11 G. Faraji, 31 : 12-, 2012

12 Y. Ito, 503 : 32-, 2009

13 C. Xu, 51 : 6139-, 2003

14 A. Mishra, 55 : 13-, 2007

15 J. -Y. Chang, 45 : 347-, 2001

16 M. Cabibbo, 36 : 401-, 2005

17 M. Reihanian, 59 : 1312-, 2008

18 M. Mohebbi, 528 : 180-, 2010

19 I. Sabirov, 560 : 1-, 2013

20 W. C. Oliver, 19 : 3-, 2004

21 A. J. Schwartz, "Electron Backscatter Diffraction in Materials Science" Springer 263-266, 2009