Precipitation hardening effect on the aging characteristics of two step stir cast Al7075-GCIp composites

Jamaluddin Hindi, U. Achutha Kini, S. S. Sharma

Research output: Contribution to journalArticle

Abstract

An investigation into the fabrication and characterization of Al7075-GCIp composites were conducted in this study. Two step, stir casting method was employed for the fabrication of composites with 2, 4 and 6 wt% of grey cast iron particulates (GCIp) of average size 50 microns. Precipitation hardening treatment was given for specimen representing each composition. Aging was carried out at 100, 150 and 200ᴼC for different time periods. Microstructure and experimental study revealthe uniform distribution of reinforcements in the composite with an acceptable level of porosity. This leads to an enhancement in the desirable properties leading to higher hardness. There was an acceleration in the aging process of the composite as the wt% of reinforcements increased. An increase in the number of nucleation sites due to the presence of reinforcement particles resulted in enhanced rates of precipitation. Hindrance for the movement of dislocations due to the presence of fine precipitates increases hardness and strength. As aging at lower temperature gives more number of precipitates, specimen aged at 100ᴼC exhibited higher hardness at each composition with excellent peak hardness for the 6 wt% reinforced composite.

Original languageEnglish
Pages (from-to)670-676
Number of pages7
JournalInternational Journal of Mechanical and Production Engineering Research and Development
Volume9
Issue numberSpecial Issue 2
Publication statusPublished - 01-01-2019

Fingerprint

Age hardening
Cast iron
Aging of materials
Hardness
Composite materials
Reinforcement
Precipitates
Fabrication
Chemical analysis
Casting
Nucleation
Porosity
Microstructure
Temperature

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

@article{1dc863facd3e407b9a0504f58d233ed5,
title = "Precipitation hardening effect on the aging characteristics of two step stir cast Al7075-GCIp composites",
abstract = "An investigation into the fabrication and characterization of Al7075-GCIp composites were conducted in this study. Two step, stir casting method was employed for the fabrication of composites with 2, 4 and 6 wt{\%} of grey cast iron particulates (GCIp) of average size 50 microns. Precipitation hardening treatment was given for specimen representing each composition. Aging was carried out at 100, 150 and 200ᴼC for different time periods. Microstructure and experimental study revealthe uniform distribution of reinforcements in the composite with an acceptable level of porosity. This leads to an enhancement in the desirable properties leading to higher hardness. There was an acceleration in the aging process of the composite as the wt{\%} of reinforcements increased. An increase in the number of nucleation sites due to the presence of reinforcement particles resulted in enhanced rates of precipitation. Hindrance for the movement of dislocations due to the presence of fine precipitates increases hardness and strength. As aging at lower temperature gives more number of precipitates, specimen aged at 100ᴼC exhibited higher hardness at each composition with excellent peak hardness for the 6 wt{\%} reinforced composite.",
author = "Jamaluddin Hindi and {Achutha Kini}, U. and Sharma, {S. S.}",
year = "2019",
month = "1",
day = "1",
language = "English",
volume = "9",
pages = "670--676",
journal = "International Journal of Mechanical and Production Engineering Research and Development",
issn = "2249-6890",
publisher = "Transstellar Journal Publications and Research Consultancy Private Limited (TJPRC)",
number = "Special Issue 2",

}

Precipitation hardening effect on the aging characteristics of two step stir cast Al7075-GCIp composites. / Hindi, Jamaluddin; Achutha Kini, U.; Sharma, S. S.

In: International Journal of Mechanical and Production Engineering Research and Development, Vol. 9, No. Special Issue 2, 01.01.2019, p. 670-676.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Precipitation hardening effect on the aging characteristics of two step stir cast Al7075-GCIp composites

AU - Hindi, Jamaluddin

AU - Achutha Kini, U.

AU - Sharma, S. S.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - An investigation into the fabrication and characterization of Al7075-GCIp composites were conducted in this study. Two step, stir casting method was employed for the fabrication of composites with 2, 4 and 6 wt% of grey cast iron particulates (GCIp) of average size 50 microns. Precipitation hardening treatment was given for specimen representing each composition. Aging was carried out at 100, 150 and 200ᴼC for different time periods. Microstructure and experimental study revealthe uniform distribution of reinforcements in the composite with an acceptable level of porosity. This leads to an enhancement in the desirable properties leading to higher hardness. There was an acceleration in the aging process of the composite as the wt% of reinforcements increased. An increase in the number of nucleation sites due to the presence of reinforcement particles resulted in enhanced rates of precipitation. Hindrance for the movement of dislocations due to the presence of fine precipitates increases hardness and strength. As aging at lower temperature gives more number of precipitates, specimen aged at 100ᴼC exhibited higher hardness at each composition with excellent peak hardness for the 6 wt% reinforced composite.

AB - An investigation into the fabrication and characterization of Al7075-GCIp composites were conducted in this study. Two step, stir casting method was employed for the fabrication of composites with 2, 4 and 6 wt% of grey cast iron particulates (GCIp) of average size 50 microns. Precipitation hardening treatment was given for specimen representing each composition. Aging was carried out at 100, 150 and 200ᴼC for different time periods. Microstructure and experimental study revealthe uniform distribution of reinforcements in the composite with an acceptable level of porosity. This leads to an enhancement in the desirable properties leading to higher hardness. There was an acceleration in the aging process of the composite as the wt% of reinforcements increased. An increase in the number of nucleation sites due to the presence of reinforcement particles resulted in enhanced rates of precipitation. Hindrance for the movement of dislocations due to the presence of fine precipitates increases hardness and strength. As aging at lower temperature gives more number of precipitates, specimen aged at 100ᴼC exhibited higher hardness at each composition with excellent peak hardness for the 6 wt% reinforced composite.

UR - http://www.scopus.com/inward/record.url?scp=85071064158&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85071064158&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85071064158

VL - 9

SP - 670

EP - 676

JO - International Journal of Mechanical and Production Engineering Research and Development

JF - International Journal of Mechanical and Production Engineering Research and Development

SN - 2249-6890

IS - Special Issue 2

ER -