Functionally graded Al–Al3Ni in situ intermetallic composites: Fabrication and microstructural characterization

Rajan, T.P.D.; Pillai, R. M.; Pai, B.C.

doi:10.1016/j.jallcom.2006.11.181

Cited by 90 publications

(34 citation statements)

References 11 publications

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“…In particular, the low formation energy associated with the creation of vacancies in the dislocation core region allows the occurrence of the climb. Such low formation energy of vacancies inside a dislocation core could be more profound in intermetallic compounds with non-cubic structures, [43][44][45] such as C16 body centered tetragonal structure (Al 2 Cu), D0 22 tetragonal structure (Al 3 Ti), D0 20 orthorhombic crystal structure (Al 3 Ni), and a monoclinic structure (Al 3 Fe) in which the slip plane is not closed packed and where a series of intermetallic compounds exist in the binary phase diagram. In contrast to Ni 3 Al, TiAl, FeAl, NiAl, and CoAl intermetallic compounds with cubic structures, their slip plane is closed packed with hexagonal atomic arrangement and the interaction of non-coplanar dislocation dipole in these compounds does not trigger dislocation climb (see Fig.…”

Section: Discussionmentioning

confidence: 99%

Dislocations interaction induced structural instability in intermetallic Al2Cu

et al. 2017

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Intermetallic precipitates are widely used to tailor mechanical properties of structural alloys but are often destabilized during plastic deformation. Using atomistic simulations, we elucidate structural instability mechanisms of intermetallic precipitates associated with dislocation motion in a model system of Al 2 Cu. Interaction of non-coplanar <001> dislocation dipoles during plastic deformation results in anomalous reactions-the creation of vacancies accompanied with climb and collective glide of <001> dislocation associated with the dislocation core change and atomic shuffle-accounting for structural instability in intermetallic Al 2 Cu. This process is profound with decreasing separation of non-coplanar dislocations and increasing temperature and is likely to be operative in other non-cubic intermetallic compounds as well.

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Section: Discussionmentioning

confidence: 99%

Dislocations interaction induced structural instability in intermetallic Al2Cu

et al. 2017

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“…5(c)) shows both acicular and equiaxed primary Al 3 Ni phases, while the region near the inner periphery shows very fine eutectic phase. The microstructures and hardness profile of Al-Al 3 Ni FGM formed from Al-20%Ni shows better graded structure compared to those formed in Al alloys with 10, 30 and 40% Ni [15].…”

Section: Al-si Fgmmentioning

confidence: 85%

“…The PCl 5 addition has still reduced the microstructure. cast hollow cylindrical casting [15]. The region near the outer periphery ( Fig.…”

Section: Al-si Fgmmentioning

confidence: 99%

Formation of solidification microstructures in centrifugal cast functionally graded aluminium composites

Rajan

Pai

2009

Trans Indian Inst Met

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A large number of engineering components and structures demand location specific performance under service conditions. A gradual transition in the microstructure or composition can motivate the changes in the functions of the specific locations for meeting the requirements and these tailored materials are termed as functionally graded materials (FGM). Centrifugal casting has emerged as the simplest and cost effective technique for producing large size engineering components of functionally graded metal matrix composites. The present paper describes the formation of different types of gradient solidification microstructures in SiC, B 4 C, SiC-graphite hybrid, primary silicon, Mg 2 Si and Al 3 Ni reinforced functionally graded aluminium composites processed by centrifugal casting and correlate the microstructures with materials and processing parameters. The densities and size of the reinforcements play a major role in the formation of graded microstructures, the high density particles/phases both SiC and Al 3 Ni form gradation towards the outer periphery and low density particles like graphite, primary silicon and Mg 2 Si form gradation towards inner periphery. The B 4 C particle having closer density to Al alloy has given more scattered distribution compare to other systems. However, functionally graded composite containing the SiC and Graphite particles has shown gradation towards inner periphery.

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“…AlSiC FGMCC fishing boat cable pulleys are fabricated successfully by centrifugal casting method. Table 1 lists the observations made on centrifugal casting of different MMC systems [22][23][24][25][26][27][28][29][30][31]. Figure 5 shows the optical microstructures of the vertical centrifugal cast Al(6061)-SiC FGM.…”

Section: Centrifugal Castingmentioning

confidence: 99%