Effect of geometric work-hardening and matrix work-hardening on workability and densification of aluminium–3.5% alumina composite during cold upsetting

Narayanasamy, R.; Anandakrishnan, V.; Pandey, K.S.

doi:10.1016/j.matdes.2007.11.006

Cited by 57 publications

(44 citation statements)

References 18 publications

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“…The measured values were used to calculate the true axial stresses (s z ), true hoop stress (s ө ), true hydrostatic stress (s m ), true effective stress (s eff ), formability stress index (β) and true axial strain (e z ). These workability parameters under tri-axial stress state conditions are calculated by using following expressions 24,25 . The true hoop strain (e θ ) can be determined by the following expression, …”

Section: Cold Upsettingmentioning

confidence: 99%

“…To decrease the porosity, many secondary processes are carried out to powder metallurgy components, among which powder forging is particularly suitable because of its cost and material saving advantages as well as the high production rates and property enhancement 23 . Narayanasamy et al 24 defined the term workability as the capacity of a material to withstand the induced internal stresses of forming before the splitting of material occurs. They also reported that, the workability of a material purely depends on the amount of ductile fracture presented in the material 24 .…”

Section: Introductionmentioning

confidence: 99%

“…Narayanasamy et al 24 defined the term workability as the capacity of a material to withstand the induced internal stresses of forming before the splitting of material occurs. They also reported that, the workability of a material purely depends on the amount of ductile fracture presented in the material 24 . The workability behavior for various ferrous and non-ferrous alloys and composites (Al-3.5%Al 2 [25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

“…Graphite mixed with lubricant oil was used as lubricant during compaction process. An indigenously developed ceramic coating was applied on the free surfaces of the compacts to avoid oxidation of the Aluminium matrix composites and dried under room temperature for a period of 12 hours 24 . The ceramic coated compacts were sintered in an electric muffle furnace in the temperature range of (590±10) °C for a period of 3 hours and cooled to room temperature in the furnace.…”

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Workability studies on Al+2.5%TiO2+Gr powder metallurgy composites during cold upsetting

Ravichandran¹,

Sait²,

Anandakrishnan

2014

Mat. Res.

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Al+2.5%TiO 2 +Gr composites were synthesized through powder metallurgy technique and their workability behavior has been studied under tri-axial stress state condition. The powders were compacted using suitable punch and die in 400 kN hydraulic press and sintered at a temperature of about 590 °C for a period of 3 hours in an electric muffle furnace. The sintered preforms were characterized by XRD and SEM analysis. Then the preforms were subjected to incremental compressive loading of 10 kN until the cracks found at the free surface. The true axial stress (s z ), true hoop stress (s ө ), true hydrostatic stress (s m ) true effective stress (s eff ), formability stress index (β) and stress ratio parameters [(s z /s eff ), (s m /s eff ), (s ө /s eff )] were calculated for all the preforms and these are correlated with the true axial strain (e z ). It is inferred that, the addition of TiO 2 and Gr to the Al matrix material increases the stress ratio parameters and formability stress index (β). A hardness test was also conducted for sintered and cold forged preforms and results are reported.

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Section: Cold Upsettingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Workability studies on Al+2.5%TiO2+Gr powder metallurgy composites during cold upsetting

Ravichandran¹,

Sait²,

Anandakrishnan

2014

Mat. Res.

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“…The closure of pores under extended deformation could be in the form of ductile fracture and subsequently enhance densification along with promoting strain hardening. It was found that strain hardening could happen in the P/M material by means of matrix as well as geometric 11 ; various attempts had been made to explain this behavior with different compositions, preform geometries and friction conditions as major influencing parameter [12][13][14][15][16] . However there were no attempt made to identify or rationalize how and when incremental loading step of 0.02MN.…”

Section: Introductionmentioning

confidence: 99%

Some aspects on geometric and matrix work-hardening characteristics of sintered cold forged copper alloy preforms

Ananthanarayanan

Rengamani²,

Sharma

2013

Mat. Res.

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Powder metallurgy (P/M) material subjected to plastic deformation results into densification, however the extended deformation would not only enhance the densification also supplements the strain hardening. Unlike fully dense material that would only undergo strain hardening while plastic deformation, the P/M material leads to pore closure as well; this phenomenon complicates the work hardening mechanism. The present study revealed that both strain and density configures strengthening of P/M preform, which respectively termed as matrix and geometric work hardening. An attempt has been made to delineate some aspects of work hardening behaviour with the influence of different aspect ratios of sintered and cold deformed copper alloy preforms. The preforms were initially prepared through conventional P/M route and finally subjected to cold upsetting under dry friction condition. A statistical analysis has also been introduced to study the quantitative impact of strain and density in the presence of aspect ratio on work hardening rate characteristics.

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Effect of sintering temperature and time intervals on workability behaviour of Al–SiC matrix P/M composite

Raj¹,

Marimuthu

Prabhakar³

et al. 2011

Int J Adv Manuf Technol

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The investigation on the effect of sintering temperature and time intervals on workability behaviour of Al-SiC powder metallurgy composites during cold upsetting was attempted in the present work. Three levels of sintering temperature and time have been considered to evaluate their effect on workability behaviour. The amount of SiC reinforcement content has been varied as 0%, 10% and 20%. The experimental results were analyzed for workability under triaxial stress state condition as a function of the relative density. The Formability Stress Index (β σ ), the Formability Strain Index (β ε ), stress ratio parameters namely σ θ /σ eff and σ z /σ m were obtained for all the cases. As a result, the exhibited tremendous variations in the various parameters for different sintering temperatures and time intervals were studied and reported.

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Effect of geometric work-hardening and matrix work-hardening on workability and densification of aluminium–3.5% alumina composite during cold upsetting

Cited by 57 publications

References 18 publications

Workability studies on Al+2.5%TiO2+Gr powder metallurgy composites during cold upsetting

Workability studies on Al+2.5%TiO2+Gr powder metallurgy composites during cold upsetting

Some aspects on geometric and matrix work-hardening characteristics of sintered cold forged copper alloy preforms

Effect of sintering temperature and time intervals on workability behaviour of Al–SiC matrix P/M composite

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