Fabrication and characteristics of alumina–iron functionally graded materials

He, Zeming; Ma, Jan; Tan, Guojin

doi:10.1016/j.jallcom.2009.07.073

Cited by 42 publications

(16 citation statements)

References 32 publications

(38 reference statements)

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“…It was observed that, upon compaction, the components formed solid structures, in which the reinforcing ZrO 2 particles were completely integrated within the transformation-induced plasticity steel matrix. Finally, it was confirmed that the graded structure of the semi-finished products was retained in the final components.built up in layers, there is a gradual change in the concentration or material properties within the material system [8,9]. The most commonly used method for the powder metallurgical fabrication of graded materials is layer pressing.…”

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confidence: 86%

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Forming Complex Graded and Homogeneous Components by Joining Simple Presintered Parts of TRIP-Matrix Composite through Powder Forging

Kirschner

Martin

Guk

et al. 2020

Metals

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The ability to fabricate complex graded structures would be a significant step towards the manufacturing of material systems with properties tailored to individual applications. While powder metallurgy has had some success in this regard, it requires that the semi-finished products be exactly similar to the final component. However, it is significantly cheaper to produce simple, semi-finished products and then join them to form complex components with the desired graded structure through powder forging and simultaneous compaction. It is also essential that the graded structure of the semi-finished products is retained during the forming process. In this study, pre-sintered cylindrical semi-finished products consisting of identical homogeneous layers as well as graded components consisting of non-identical homogeneous layers were joined using powder forging at 1100 °C. The microstructures and densities as well as the mechanical properties of the final components were investigated. It was observed that, upon compaction, the components formed solid structures, in which the reinforcing ZrO2 particles were completely integrated within the transformation-induced plasticity steel matrix. Finally, it was confirmed that the graded structure of the semi-finished products was retained in the final components.

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confidence: 86%

“…In this method, different powder mixtures are filled in the die in a layer-by-layer manner in the corresponding step size, either parallel or perpendicular to the pressing direction. The mixtures are then pressed together and consolidated or sintered [4,6,[8][9][10]. However, a relative density of only approximately 91% can be achieved in this manner.…”

mentioning

confidence: 99%

Forming Complex Graded and Homogeneous Components by Joining Simple Presintered Parts of TRIP-Matrix Composite through Powder Forging

Kirschner

Martin

Guk

et al. 2020

Metals

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“…[38] It is also known that the larger crack-tip deformation zone yields more dissipation of energy imposed by the external loads, which contributes superior fracture toughness and fracture energy to the material. [36,39] In conclusion, resultant fracture behavior of FGMs is dictated by the combination of these intrinsic and extrinsic fracture mechanisms which may increase the remnant strength of a cracked material. [40] This behavior would be very important in the point of view for application where the necessity of high wear resistance in some parts together with overall strength and ductility encourages the designers to use FG Al-SiC composite due to enhanced structural safety and reliability.…”

Section: Tensile Behaviormentioning

confidence: 99%

Improvement of Mechanical Properties in the Functionally Graded Aluminum Matrix Nanocomposites Fabricated via a Novel Multistep Friction Stir Processing

Salehi

Farnoush

Heydarian

et al. 2014

Metall Mater Trans B

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In the present study, the functionally graded bulk Al-SiC nanocomposites were successfully fabricated by applying a novel multistep friction stir processing. Microstructural observations by scanning electron microscope indicated a proper distribution of SiC nanoparticles in the Al 6061 matrix. Microhardness profiles descended to 50 from 160 Hv due to the formation of compositionally gradient of SiC nanoparticles along the thickness. The tensile behavior of graded samples revealed a simultaneous enhancement of ultimate tensile strength (44 pct), strain at maximum stress (244 pct), and work of fracture (492 pct) with respect to the homogeneous sample. Furthermore, the graded samples sustained up to 4 pct strain after initiation of primary cracking, while the catastrophic fracture occurred instantly after cracking in the homogenous sample. A dimple-like ductile fracture surface was observed for the graded layers in which an increase in the SiC particle content will result in smaller dimple size.

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“…Recently, to minimize residual stresses, deposition of functionally graded material are used. This process can minimize the differences of mismatch of thermal strain between materials [15]. So, it is required to develop an understanding of the influence of materials properties on the formation of residual stresses.…”

Section: Introduction To the Style Guidementioning

confidence: 99%

An analytical model to predict and minimize the residual stress of laser cladding process

et al. 2018

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Laser cladding is one of the advanced thermal techniques used to repair or modify the surface properties of high-value components such as tools, military and aerospace parts. Unfortunately, tensile residual stresses are generated in the thermally treated area of this process. This work focuses on to investigate the key factors for the formation of tensile residual stress and how to minimize it in the clad when using dissimilar substrate and clad materials. To predict the tensile residual stress, a onedimensional analytical model has been adopted. Four cladding materials (Al 2 O 3 , TiC, TiO 2 , ZrO 2 ) on the H13 tool steel substrate and a range of preheating temperatures of the substrate, from 300 to 1200 K, have been investigated. Thermal strain and Young's modulus are found to be the key factors of formation of tensile residual stresses. Additionally, it is found that using a preheating temperature of the substrate immediately before laser cladding showed the reduction of residual stress.

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Fabrication and characteristics of alumina–iron functionally graded materials

Cited by 42 publications

References 32 publications

Forming Complex Graded and Homogeneous Components by Joining Simple Presintered Parts of TRIP-Matrix Composite through Powder Forging

Forming Complex Graded and Homogeneous Components by Joining Simple Presintered Parts of TRIP-Matrix Composite through Powder Forging

Improvement of Mechanical Properties in the Functionally Graded Aluminum Matrix Nanocomposites Fabricated via a Novel Multistep Friction Stir Processing

An analytical model to predict and minimize the residual stress of laser cladding process

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