Workability studies of sintered aluminium composites during hot deformation

Narayan, Sumesh; Ananthanarayanan, Rajeshkannan

doi:10.1177/0954405414556497

Cited by 13 publications

(6 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shown porosity of the preforms can influence positively on heat and wear resistance, tensile strength (~30% by analyzed data) of the final product [76][77][78][79][80][81][82]. It should be noted that ultimate stress tensile was pre-estimated by true-stress true-strain tensile test and fitting curves for bulk specimens obtained by equations shown in [65] and the Ludwik equation [83].…”

Section: Discussionmentioning

confidence: 99%

A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts

et al. 2019

View full text Add to dashboard Cite

Highly performance methods for cold pressing (cold die forging) of preforms from iron powder with subsequent heat treatment and producing ready parts made of powder are described in the paper. These methods allow fabricating parts with smooth surfaces and improved mechanical characteristics—porosity, tensile strength. Application of the traditional design set-up with a single-axial loading is restricted to high stresses in the dies to deform the preforms that lead to cracks formation. New powder compaction schemes by applying active friction forces (shear-enhanced compaction) make it possible to unload dies and produce high-quality parts by cold pressing. The scheme allows moving the die in the direction of the material flow with a velocity that exceeds the material flow velocity.

show abstract

Section: Discussionmentioning

confidence: 99%

A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts

et al. 2019

View full text Add to dashboard Cite

show abstract

“…14,15 Many researchers have evaluated the workability of various P/M samples and they found that the workability of the samples relies heavily on the pores present in the workpiece. [16][17][18][19][20][21][22][23][24][25] They observed that the workability is high for samples with fewer pores and the workability is low for samples with more pores. The authors performed the upsetting test on sintered P/M steel samples and investigated the influence of porosity on the microstructure evolution during the process.…”

Section: Introduction and Literature Studymentioning

confidence: 99%

Role of localized heating on the workability of powder metallurgical Al–4% Ti components in cold compression

Tharmaraj

Davidson

Richard³

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

In the present work, localised heating has been adopted at the damage site of the cold upset materials and the role of this mechanism on the workability has been analysed. Cylindrical specimens containing 96% aluminium and 4% titanium were prepared through powder metallurgy technique with an aspect ratio (height to diameter) of 1 by suitable pressures. A series of cold upsetting test was conducted and the material properties for various preforms initial relative densities (80%, 85% and 90%) were determined under the stable strain rate. The flow of metals was analysed using a finite element tool and it was observed that the metal flow starts from near the centre zone to the equatorial zone and the damage happens in the outer position because of more amount of accumulated stresses and the pores. These stresses and pores decrease the workability of the final component. Hence, the present research is intended to reduce the stresses and minimize the pores by applying a localized heating (100 °C–250 °C) at the equatorial sites of the components and thereby increasing the workability of the material. Also, heating selectively at the equatorial site of the workpiece improves the workability due to change in grain size and it was noticed that the grain size of the developed porous preforms was high for the higher heating conditions due to the growth of the grains. Therefore, the localized heating adopted in this work is a superior method to enhance the workability of the powder samples and this novel technique could be useful in improving the workability of the structural components that have extensive applications in the automobile and aerospace industries.

show abstract

“…Composites produced by blending materials of different types together are vowing to extend the performance limits of monolithic materials, 4,5 such as mechanical and thermal fatigue and creep resistance. 6,7 Narayan and Rajeshkannan 8,9 focused on the influence of different carbide compositions with aluminium on the stress ratio parameters, relative density and workability at various aspect ratios such as 0.4 and 0.6. It was observed that the titanium carbide preforms showed the good workability characteristics and densification rate.…”

Section: Introductionmentioning

confidence: 99%

Formability and densification behavior of two-layered structure powder metallurgical hot-pressed Al-Cu/Al composites during hot-upsetting

Rajasekhar

Babu

Davidson

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

An experimental investigation has been performed on the hot formability and densification characteristics of Al-Cu/Al two-layered structure composites. The two-layered composites having different Cu compositions in the Al-Cu layer such as (Cu: 5wt. %, 10wt. %, and 15wt. %) were prepared using the powder metallurgy (P/M) route. The composites were hot-pressed as layer by layer in a steel cylindrical die at 550°C temperature with 0.9 initial relative density (IRD) and 0.1 s−1 strain rate. The preforms were hot deformed between two flat dies with a capacity of 50-ton hydraulic press machine at a temperature range of 150°C – 450°C under triaxial stress state condition. The hot-upsetting behaviour of preforms was analyzed until the cracks begin on the cylindrical preform at the outer surface. The effect of different Cu composition and various deformation temperatures on two-layered preforms were discussed. Results revealed that the (10wt. %Cu) preform achieved good cooperative deformation behaviour between Al-Cu and Al layers at the interface region. The relationship between the process parameters was discussed such as the effect of axial stress ([Formula: see text]), relative density ( R) on axial strain ([Formula: see text]) and formability stress index ( β), different stress ratio parameters ([Formula: see text], [Formula: see text]) on relative density ( R).

show abstract

Workability studies of sintered aluminium composites during hot deformation

Cited by 13 publications

References 34 publications

A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts

A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts

Role of localized heating on the workability of powder metallurgical Al–4% Ti components in cold compression

Formability and densification behavior of two-layered structure powder metallurgical hot-pressed Al-Cu/Al composites during hot-upsetting

Contact Info

Product

Resources

About