Pengaruh unsur zirkonium terhadap sifat mekanik aloi tempaan Al-1.2Si-0.5Mg-0.25 Fe

Translated title of the contribution: Influence of zirconium on mechanical properties of Al-1.2Si-0.5Mg-0.25 Fe wrought alloy

Karen Wong Mee Chu, Abdul Razak Daud, Azman Jalar @ Jalil

Research output: Contribution to journalArticle

Abstract

The heat-treatable 6XXX series wrought aluminium alloys need to undergo various thermomechanical processes before they can be used as external car body skin. A lengthy natural aging at room temperature is detrimental to the age hardening of these alloys. Many researchers introduced an additional step such as pre-aging to offset the detrimental effects of the natural aging. The present work is aimed to improve the age-hardening response of the Al-1.2Si-0. 5Mg-0.25Fe sheet alloy through Zr additions between 0.02 to 0.30 wt %. The alloys were water-quenched to room temperature and naturally aged for 14 days before undergoing heat-treatment at 180°C for 30 minutes and 11 hours. Microhardness of Al-1.2Si-0.5Mg-0.25Fe alloy without Zr is 80.2 VHN for the 30 minutes heat-treatment and 105.0 VHN for the 11 hours heat-treatment. Microhardness, ultimate tensile strength and yield strength values for alloys containing Zr heat-treated at 180°C for 11 hours are far more superior compared to the same set of alloys heat-treated for 30 minutes. Nevertheless, alloy containing 0.30 wt %. Zr which was heat-treated for 30 minutes have higher microhardness, ultimate tensile strength and yield strength compared to the alloy without Zr which was heat-treated for 11 hours. Increment in the mechanical properties reported is attributed to grain refinement phenomenon.

Original languageMalay
Pages (from-to)189-193
Number of pages5
JournalSains Malaysiana
Volume37
Issue number2
Publication statusPublished - Jun 2008

Fingerprint

Zirconium
Mechanical properties
Microhardness
Age hardening
Aging of materials
Heat treatment
Yield stress
Tensile strength
Grain refinement
Aluminum alloys
Skin
Railroad cars
Hot Temperature
Temperature
Water

Keywords

  • Grain refinement
  • Microhardness
  • Ultimate tensile strength
  • Yield strength

ASJC Scopus subject areas

  • General

Cite this

Pengaruh unsur zirkonium terhadap sifat mekanik aloi tempaan Al-1.2Si-0.5Mg-0.25 Fe. / Chu, Karen Wong Mee; Daud, Abdul Razak; Jalar @ Jalil, Azman.

In: Sains Malaysiana, Vol. 37, No. 2, 06.2008, p. 189-193.

Research output: Contribution to journalArticle

Chu, Karen Wong Mee ; Daud, Abdul Razak ; Jalar @ Jalil, Azman. / Pengaruh unsur zirkonium terhadap sifat mekanik aloi tempaan Al-1.2Si-0.5Mg-0.25 Fe. In: Sains Malaysiana. 2008 ; Vol. 37, No. 2. pp. 189-193.
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abstract = "The heat-treatable 6XXX series wrought aluminium alloys need to undergo various thermomechanical processes before they can be used as external car body skin. A lengthy natural aging at room temperature is detrimental to the age hardening of these alloys. Many researchers introduced an additional step such as pre-aging to offset the detrimental effects of the natural aging. The present work is aimed to improve the age-hardening response of the Al-1.2Si-0. 5Mg-0.25Fe sheet alloy through Zr additions between 0.02 to 0.30 wt {\%}. The alloys were water-quenched to room temperature and naturally aged for 14 days before undergoing heat-treatment at 180°C for 30 minutes and 11 hours. Microhardness of Al-1.2Si-0.5Mg-0.25Fe alloy without Zr is 80.2 VHN for the 30 minutes heat-treatment and 105.0 VHN for the 11 hours heat-treatment. Microhardness, ultimate tensile strength and yield strength values for alloys containing Zr heat-treated at 180°C for 11 hours are far more superior compared to the same set of alloys heat-treated for 30 minutes. Nevertheless, alloy containing 0.30 wt {\%}. Zr which was heat-treated for 30 minutes have higher microhardness, ultimate tensile strength and yield strength compared to the alloy without Zr which was heat-treated for 11 hours. Increment in the mechanical properties reported is attributed to grain refinement phenomenon.",
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