“…The crystallite size and lattice strain of nanocomposites were calculated according to Williamson and Hall method. 19 The crystallite size of hybrid Al/CNT/Al 2 O 3 nanocomposites was about 14.31 nm, while lattice strain was 0.67%. The crystallite size of hybrid Al/CNT/Al 2 O 3 nanocomposites was smaller than that of Al/CNTs (26.23 nm), Al/Al 2 O 3 nanocomposites (23.61 nm) and Al5083 alloy (31.19 nm).…”
Section: Resultsmentioning
confidence: 95%
“…Two mechanisms are responsible for enhanced hardness in SZ zone, one is the presence of CNTs and Al 2 O 3 nanoparticles and the other is the microstructural variation including grain structure refinement. 19,33 The presence of CNTs and Al 2 O 3 nanoparticles contributes in preventing dislocations movement and further improves the hardness. 19 Figure 6.Hardness profile of Al/CNTs, Al/Al 2 O 3 and Al/CNTs/Al 2 O 3 nanocomposites in different processing zones.…”
Section: Resultsmentioning
confidence: 99%
“…This is also in agreement with previous findings reported by Jain and Muthukumaran 18 and You et al 24 However, the main reason of reduction in crystallite size is attributed to the generation of large amount of dislocation resulting from severe local deformation and accelerated work hardening. 19 In other words, the crystallite size reduction is also attributed to the presence of the reinforcement phase which generates crystal defects and dislocations and hence reduces the crystallite size. [25][26][27] Also, the ball milling of the reinforcements before FSP reduced the size of CNTs and Al 2 O 3 and resulted in the precipitation of CNTs on the surface of Al 2 O 3 particles (see Figure 1(c)).…”
Section: Resultsmentioning
confidence: 99%
“…The microstructure and chemical composition of as-received Al5083 alloy are shown in the previous work done by the authors. 19 It consists of elongated grains with average grain size of ∼58 µm. Alumina nanoparticles (Al 2 O 3 ; >99% purity) and multi-walled carbon nanotubes (MWCNT, size < 20 nm), as the reinforcement additives, were supplied from Cheap tubes.…”
Section: Methodsmentioning
confidence: 99%
“…The FSP procedure and its parameters were detailed in a previous study conducted by authors. 19 The FSP parameters were optimized to obtain defect-free stir zones (SZ), homogenous dispersion of nanoparticles and reduced grain size (see Table 1). The FSP parameters were kept constant for all the specimens.…”
In the present study, friction stir processing was adopted for surface treatment of Al5083 by incorporation of CNT and Al2O3 nanoparticles. Microstructural, mechanical and tribological properties of the surface of Al5083/CNT, Al5083/Al2O3 and hybrid Al5083/CNT/Al2O3 nanocomposite were investigated and compared. The friction stir processing yielded a nearly uniform dispersion of CNTs and Al2O3 nanoparticles, irrespective of nanoparticle reinforcements and their weight fraction. Microstructural observations revealed that Al2O3 nanoparticles have dispersed in different zones including intra-grain and grain boundary zones while, CNTs are pinned into grain boundaries during friction stir processing. From mechanical point of view, hybridization of CNT/Al2O3 enhances the hardness (126 HV at stirred zone), strength (UTS of ∼487 MPa) and also wear resistance of Al5083/CNT/Al2O3 nanocomposites. The enhancement is attributed to the presence and combination of features of both CNT and Al2O3 nanoparticles which are different in nature; one spherical oxide and one nanotube.
“…The crystallite size and lattice strain of nanocomposites were calculated according to Williamson and Hall method. 19 The crystallite size of hybrid Al/CNT/Al 2 O 3 nanocomposites was about 14.31 nm, while lattice strain was 0.67%. The crystallite size of hybrid Al/CNT/Al 2 O 3 nanocomposites was smaller than that of Al/CNTs (26.23 nm), Al/Al 2 O 3 nanocomposites (23.61 nm) and Al5083 alloy (31.19 nm).…”
Section: Resultsmentioning
confidence: 95%
“…Two mechanisms are responsible for enhanced hardness in SZ zone, one is the presence of CNTs and Al 2 O 3 nanoparticles and the other is the microstructural variation including grain structure refinement. 19,33 The presence of CNTs and Al 2 O 3 nanoparticles contributes in preventing dislocations movement and further improves the hardness. 19 Figure 6.Hardness profile of Al/CNTs, Al/Al 2 O 3 and Al/CNTs/Al 2 O 3 nanocomposites in different processing zones.…”
Section: Resultsmentioning
confidence: 99%
“…This is also in agreement with previous findings reported by Jain and Muthukumaran 18 and You et al 24 However, the main reason of reduction in crystallite size is attributed to the generation of large amount of dislocation resulting from severe local deformation and accelerated work hardening. 19 In other words, the crystallite size reduction is also attributed to the presence of the reinforcement phase which generates crystal defects and dislocations and hence reduces the crystallite size. [25][26][27] Also, the ball milling of the reinforcements before FSP reduced the size of CNTs and Al 2 O 3 and resulted in the precipitation of CNTs on the surface of Al 2 O 3 particles (see Figure 1(c)).…”
Section: Resultsmentioning
confidence: 99%
“…The microstructure and chemical composition of as-received Al5083 alloy are shown in the previous work done by the authors. 19 It consists of elongated grains with average grain size of ∼58 µm. Alumina nanoparticles (Al 2 O 3 ; >99% purity) and multi-walled carbon nanotubes (MWCNT, size < 20 nm), as the reinforcement additives, were supplied from Cheap tubes.…”
Section: Methodsmentioning
confidence: 99%
“…The FSP procedure and its parameters were detailed in a previous study conducted by authors. 19 The FSP parameters were optimized to obtain defect-free stir zones (SZ), homogenous dispersion of nanoparticles and reduced grain size (see Table 1). The FSP parameters were kept constant for all the specimens.…”
In the present study, friction stir processing was adopted for surface treatment of Al5083 by incorporation of CNT and Al2O3 nanoparticles. Microstructural, mechanical and tribological properties of the surface of Al5083/CNT, Al5083/Al2O3 and hybrid Al5083/CNT/Al2O3 nanocomposite were investigated and compared. The friction stir processing yielded a nearly uniform dispersion of CNTs and Al2O3 nanoparticles, irrespective of nanoparticle reinforcements and their weight fraction. Microstructural observations revealed that Al2O3 nanoparticles have dispersed in different zones including intra-grain and grain boundary zones while, CNTs are pinned into grain boundaries during friction stir processing. From mechanical point of view, hybridization of CNT/Al2O3 enhances the hardness (126 HV at stirred zone), strength (UTS of ∼487 MPa) and also wear resistance of Al5083/CNT/Al2O3 nanocomposites. The enhancement is attributed to the presence and combination of features of both CNT and Al2O3 nanoparticles which are different in nature; one spherical oxide and one nanotube.
The steel/aluminum dissimilar metal welding plays a significant role in lightweighting automotive structures. However, the formation of hard and brittle intermetallic compounds (IMCs) in steel/aluminum welded joints severely compromises their mechanical performance. Nano ceramic particles such as TiC possess characteristics that inhibit the diffusion of Fe and Al, thereby exhibiting a significant advantage in suppressing IMCs formation in steel/aluminum welded joints. In this study, an optimized laser‐welding process is employed to investigate the mechanical properties of steel/aluminum dissimilar metal joints with different concentrations of TiC nanoparticles. It is aimed to determine the optimal TiC addition concentration by comparing the mechanical performance. Additionally, the inhibitory effect of TiC particles on the formation and growth of brittle Fe–Al IMCs is explored through an analysis of IMCs growth kinetics. In the research results, it is shown that the optimal TiC addition concentration is 1%. At this concentration, the tensile strength of the steel/aluminum welded joint reaches 98.29 MPa, showing a remarkable improvement of 32.65% compared to the sample without TiC addition. The addition of TiC particles suppresses the mutual diffusion between Fe and Al, reduces the generation of brittle IMCs, and enhances the mechanical performance of the steel/aluminum joint.
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