Microhardness and tensile properties of a 6XXX alloy through minor additions of Zr

Karen M C Wong, A. R. Daud, Azman Jalar @ Jalil

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The 6XXX series alloy is known to show inferior age-hardening response during the paint-bake cycle due to natural aging prior to the paint-bake. Many researchers have adopted the pre-aging process to offset the detrimental effect of the natural aging process. The alloy used in this study contained excess Si, and it had been reported elsewhere that such alloys do not show positive response to the pre-aging process. The present work is aimed to study the microhardness and tensile strength of the Al-1.2Si-0.5Mg-0.25Fe wrought alloy through Zr additions between 0.02 and 0.30 wt.%. Alloys containing 0.15 wt.% Zr and above heat-treated for 30 min gave higher microhardness and ultimate tensile strength values compared to that of Al-1.2Si-0.5Mg-0.25Fe without Zr which was heat-treated for 11 h. It was found that mechanical properties improved when the Zr content in the alloys increased. The improvement of mechanical properties was mainly attributed to formation of Zr-bearing intermetallic compounds formed in the alloy.

Original languageEnglish
Pages (from-to)62-65
Number of pages4
JournalJournal of Materials Engineering and Performance
Volume18
Issue number1
DOIs
Publication statusPublished - Feb 2009

Fingerprint

Tensile properties
Microhardness
Aging of materials
Paint
Tensile strength
Bearings (structural)
Mechanical properties
Age hardening
Intermetallics

Keywords

  • Grain refinement
  • Intermetallic compounds
  • Mechanical properties
  • Zirconium

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Microhardness and tensile properties of a 6XXX alloy through minor additions of Zr. / Wong, Karen M C; Daud, A. R.; Jalar @ Jalil, Azman.

In: Journal of Materials Engineering and Performance, Vol. 18, No. 1, 02.2009, p. 62-65.

Research output: Contribution to journalArticle

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