Record number :
2161640
Title of article :
Indentation-induced subsurface damage in silicon particles of Al–Si alloys
Author/Authors :
Bhattacharya، نويسنده , , S. and Riahi، نويسنده , , A.R. and Alpas، نويسنده , , A.T.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
10
From page :
387
To page :
396
Abstract :
Damage microstructures generated beneath the Vickers indentation applied to the silicon particles in an Al–18.5 wt.%Si alloys were studied. Plastic deformation at low loads and volume expansion due to subsurface crack formation at high loads (>650 mN) were responsible for pile-up formations around the indentations. The probability of lateral cracks reaching the surface and causing particle fracture was shown to obey Weibull statistics with a low modulus. The indentation pressure estimated as 19.3 GPa induced the transformation of diamond cubic Si-I to bcc Si-III and rhombohedral Si-XII, as observed by Raman microspectroscopy. Cross-sectional FIB and TEM revealed a semi-circular plastic core and subsurface lateral crack pattern below the residual indents and a localized amorphous zone at the median crack boundary immediately below the plastic core.
Keywords :
Al–Si alloys , Indentation , Particle fracture , Pile-up formation , Phase transformations , SUBSURFACE DAMAGE
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2009
Link To Document :
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