TY  - EJOU
AU  - Zhang, Haiming 
AU  - Zhao, Shilin 
AU  - Cui, Zhenshan 

TI  - Understanding	the	Micromechanical	Behaviors	of	Particle-Reinforced	Al	 Composite	by	Nonlocal	Crystal	Plasticity	Modeling
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 25
IS  - 4
SN  - 1933-2815

AB  - Particle-reinforced	 aluminum	 matrix	 composites	 (PRAMCs)	 have	 great	 potential	 for	 application	 in	
aerospace,	automobile,	defense,	and	electronics	due	to	their	high	specific	strength	and	stiffness	and	good	
resistance	 to	 wear	 and	 corrosion.	 Achieving	 a	 superior	 trade-off	 between	 the	 strength	 and	 ductility	 of	
PRAMCs	necessitates	an	elaborative	control	of	the	microstructures,	like	the	size	and	distribution	of	particles,	
as	well	as	grain	size,	morphology,	and	texture	of	the	matrix.	The	multiscale	interaction	between	the	particles	
and	 the	 matrix’s	 microstructure	 is	 insufficiently	 understood	 due	 to	 the	 lagging	 of	 high-resolved	 in-situ	
characterization.	This	work	proposes	a	nonlocal	physically	based	crystal	plasticity	(CP)	modeling	approach	
to	 reveal	 the	 underlying	 micro-mechanisms	 of	 deformation	 and	 strengthening	 of	 a	 TiB2/Al-Zn-Mg-Cu	
composite	 with	 various	 microstructures.	 The	 CP	 constitutive	 model	 considers	 both	 the	 kinetics	 of	
statistically	 stored	 dislocations	 (SSDs)	 and	 the	 strain	 gradient	 effect	 in	 terms	 of	 the	 enhancement	 of	
geometrically	necessary	dislocations	(GNDs).	The	spectral	method	based	on	the	 fast	Fourier	transform	is	
employed	to	calculate	the	high-order	gradient	terms	associated	with	updating	GND	density.	Multiscale	fullfield	CP	simulations	were	conducted	on	high-resolved	microstructural	RVEs	of	PRAMCs.	Results	show	that	
decreasing	grain	size	and	adding	reinforced	particles	simultaneously	accelerate	the	multiplication	of	SSDs	
and	GNDs	 by	 promoting	 the	 formation	 of	 strain	 concentrations	and	 high	 plastic	 strain	gradients.	 Larger	
orientation	 scattering	 occurs	 and	more	 slip	 systems	 are	 activated	in	 the	 region	 close	 to	 the	 particles	 to	
accommodate	the	deformation	compatibility.	The	interaction	between	the	various-sized	particles	and	the	
matrix	was	quantified	in	terms	of	the	grain-level	deformation	heterogeneity	and	stress/strain	partitioning,	
and	local	crystallographic	orientation	change.
KW  - Nonlocal	 crystal	 plasticity	 modeling;	 particle	 reinforced	 aluminum	 matrix	 composites;	 geometrically	 necessary	dislocations	(GNDs);	spectral	method

DO  - 10.32604/icces.2023.08884