Effect of SiC particulate reinforcement on the precipitation hardening behavior of two step stir cast Al 6061 alloy

M. C. Gowri Shankar, U. Achutha Kini, S. S. Sharma, P. R. Prabhu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this paper, the production and characterization of Al 6061/SiC composites, prepared by using a stir casting method, were investigated. Al 6061/SiC composites containing 2, 4 and 6 wt. percent of SiC were produced; and samples representative of each composition were subjected to age-hardening treatment at aging temperatures of 100°C and 200°C for different intervals of time. The aging behavior and tensile properties of the cast material were studied. Experimental results show that Al 6061/SiC composites having low porosity levels and a good uniform distribution of the SiC particulates in the matrix of the Al 6061 were produced leading to higher hardness, and tensile strength. Presence of SiC particles in Al alloys accelerating the aging process and thus attain to higher strength. These particles provide more sites for the nucleation of fine precipitates. These fine precipitates hinder the movement of dislocation and thus increases hardness as well strength of materials. After aging at 100°C, highest strength can be obtained at longer duration of aging. This has been supported by Transmission Electron Microscope micrographs of the same condition. For aging at lower temperature gives more number of fine precipitates. It was also found that the precipitation kinetics of GP zones in the composite material was accelerated, owing to the heterogeneous nucleation capability of metastable phases on the SiC particles. Nevertheless, the decohesion of the interface between the metal matrix and SiC particles led to the formation of voids which, subsequently, combined to generate the ductile rupture of the metal matrix.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalInternational Journal of Applied Engineering Research
Volume10
Issue number78
Publication statusPublished - 01-01-2015

Fingerprint

Age hardening
Reinforcement
Aging of materials
Precipitates
Composite materials
Nucleation
Hardness
Metastable phases
Metals
Tensile properties
Strength of materials
Casting
Tensile strength
Electron microscopes
Porosity
Temperature
Kinetics
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

@article{5acf8672becb4ebea61eda1593b9daee,
title = "Effect of SiC particulate reinforcement on the precipitation hardening behavior of two step stir cast Al 6061 alloy",
abstract = "In this paper, the production and characterization of Al 6061/SiC composites, prepared by using a stir casting method, were investigated. Al 6061/SiC composites containing 2, 4 and 6 wt. percent of SiC were produced; and samples representative of each composition were subjected to age-hardening treatment at aging temperatures of 100°C and 200°C for different intervals of time. The aging behavior and tensile properties of the cast material were studied. Experimental results show that Al 6061/SiC composites having low porosity levels and a good uniform distribution of the SiC particulates in the matrix of the Al 6061 were produced leading to higher hardness, and tensile strength. Presence of SiC particles in Al alloys accelerating the aging process and thus attain to higher strength. These particles provide more sites for the nucleation of fine precipitates. These fine precipitates hinder the movement of dislocation and thus increases hardness as well strength of materials. After aging at 100°C, highest strength can be obtained at longer duration of aging. This has been supported by Transmission Electron Microscope micrographs of the same condition. For aging at lower temperature gives more number of fine precipitates. It was also found that the precipitation kinetics of GP zones in the composite material was accelerated, owing to the heterogeneous nucleation capability of metastable phases on the SiC particles. Nevertheless, the decohesion of the interface between the metal matrix and SiC particles led to the formation of voids which, subsequently, combined to generate the ductile rupture of the metal matrix.",
author = "{Gowri Shankar}, {M. C.} and {Achutha Kini}, U. and Sharma, {S. S.} and Prabhu, {P. R.}",
year = "2015",
month = "1",
day = "1",
language = "English",
volume = "10",
pages = "18--24",
journal = "International Journal of Applied Engineering Research",
issn = "0973-4562",
publisher = "Research India Publications",
number = "78",

}

Effect of SiC particulate reinforcement on the precipitation hardening behavior of two step stir cast Al 6061 alloy. / Gowri Shankar, M. C.; Achutha Kini, U.; Sharma, S. S.; Prabhu, P. R.

In: International Journal of Applied Engineering Research, Vol. 10, No. 78, 01.01.2015, p. 18-24.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of SiC particulate reinforcement on the precipitation hardening behavior of two step stir cast Al 6061 alloy

AU - Gowri Shankar, M. C.

AU - Achutha Kini, U.

AU - Sharma, S. S.

AU - Prabhu, P. R.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - In this paper, the production and characterization of Al 6061/SiC composites, prepared by using a stir casting method, were investigated. Al 6061/SiC composites containing 2, 4 and 6 wt. percent of SiC were produced; and samples representative of each composition were subjected to age-hardening treatment at aging temperatures of 100°C and 200°C for different intervals of time. The aging behavior and tensile properties of the cast material were studied. Experimental results show that Al 6061/SiC composites having low porosity levels and a good uniform distribution of the SiC particulates in the matrix of the Al 6061 were produced leading to higher hardness, and tensile strength. Presence of SiC particles in Al alloys accelerating the aging process and thus attain to higher strength. These particles provide more sites for the nucleation of fine precipitates. These fine precipitates hinder the movement of dislocation and thus increases hardness as well strength of materials. After aging at 100°C, highest strength can be obtained at longer duration of aging. This has been supported by Transmission Electron Microscope micrographs of the same condition. For aging at lower temperature gives more number of fine precipitates. It was also found that the precipitation kinetics of GP zones in the composite material was accelerated, owing to the heterogeneous nucleation capability of metastable phases on the SiC particles. Nevertheless, the decohesion of the interface between the metal matrix and SiC particles led to the formation of voids which, subsequently, combined to generate the ductile rupture of the metal matrix.

AB - In this paper, the production and characterization of Al 6061/SiC composites, prepared by using a stir casting method, were investigated. Al 6061/SiC composites containing 2, 4 and 6 wt. percent of SiC were produced; and samples representative of each composition were subjected to age-hardening treatment at aging temperatures of 100°C and 200°C for different intervals of time. The aging behavior and tensile properties of the cast material were studied. Experimental results show that Al 6061/SiC composites having low porosity levels and a good uniform distribution of the SiC particulates in the matrix of the Al 6061 were produced leading to higher hardness, and tensile strength. Presence of SiC particles in Al alloys accelerating the aging process and thus attain to higher strength. These particles provide more sites for the nucleation of fine precipitates. These fine precipitates hinder the movement of dislocation and thus increases hardness as well strength of materials. After aging at 100°C, highest strength can be obtained at longer duration of aging. This has been supported by Transmission Electron Microscope micrographs of the same condition. For aging at lower temperature gives more number of fine precipitates. It was also found that the precipitation kinetics of GP zones in the composite material was accelerated, owing to the heterogeneous nucleation capability of metastable phases on the SiC particles. Nevertheless, the decohesion of the interface between the metal matrix and SiC particles led to the formation of voids which, subsequently, combined to generate the ductile rupture of the metal matrix.

UR - http://www.scopus.com/inward/record.url?scp=85011382907&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85011382907&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85011382907

VL - 10

SP - 18

EP - 24

JO - International Journal of Applied Engineering Research

JF - International Journal of Applied Engineering Research

SN - 0973-4562

IS - 78

ER -