Influence of Cu content on microstructure and mechanical properties of thixoformed Al-Si-Cu-Mg alloys

M. S. Salleh, Mohd. Zaidi Omar

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Abstract

The effects of Cu content on the microstructure and mechanical properties of thixoformed Al-6Si-xCu-0.3Mg (x= 3, 4, 5 and 6, mass fraction, %) alloys were studied. The samples were thixoformed at 50% liquid content and several of the samples were treated with the T6 heat treatment. The samples were then examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis, as well as hardness and tensile tests. The results show that the cooling slope casting and thixoforming process promote the formation of very fine and well distributed intermetallic compounds in the aluminium matrix and the mechanical properties of the alloys increase considerably compared with the permanent mould casting. The results also reveal that as the Cu content in the alloy increases, the hardness and tensile strength of the thixoformed alloys also increase. The ultimate tensile strength, yield strength and elongation to fracture of the thixoformed heat-treated Al-6Si-3Cu-0.3Mg alloy are 298 MPa, 201 MPa and 4.5%, respectively, whereas the values of the thixoformed heat-treated alloy with high Cu content (6%) are 361 MPa, 274 MPa and 1.1%, respectively. The fracture of the thixoformed Al-6Si-3Cu-0.3Mg alloy shows a dimple rupture, whereas in the alloy that contains the highest Cu content (6%), a cleavage fracture is observed.

Original languageEnglish
Pages (from-to)3523-3538
Number of pages16
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume25
Issue number11
DOIs
Publication statusPublished - 1 Nov 2015

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mechanical property
microstructure
mechanical properties
Mechanical properties
Microstructure
tensile strength
hardness
Tensile strength
Hardness
Permanent mold casting
hardness tests
heat
yield strength
tensile tests
Aluminum
X ray diffraction analysis
cleavage
X-ray spectroscopy
elongation
Intermetallics

Keywords

  • Al-Si-Cu-Mg alloy
  • Cu content
  • mechanical properties
  • T6 heat treatment
  • thixoforming

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Materials Chemistry
  • Metals and Alloys
  • Condensed Matter Physics

Cite this

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title = "Influence of Cu content on microstructure and mechanical properties of thixoformed Al-Si-Cu-Mg alloys",
abstract = "The effects of Cu content on the microstructure and mechanical properties of thixoformed Al-6Si-xCu-0.3Mg (x= 3, 4, 5 and 6, mass fraction, {\%}) alloys were studied. The samples were thixoformed at 50{\%} liquid content and several of the samples were treated with the T6 heat treatment. The samples were then examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis, as well as hardness and tensile tests. The results show that the cooling slope casting and thixoforming process promote the formation of very fine and well distributed intermetallic compounds in the aluminium matrix and the mechanical properties of the alloys increase considerably compared with the permanent mould casting. The results also reveal that as the Cu content in the alloy increases, the hardness and tensile strength of the thixoformed alloys also increase. The ultimate tensile strength, yield strength and elongation to fracture of the thixoformed heat-treated Al-6Si-3Cu-0.3Mg alloy are 298 MPa, 201 MPa and 4.5{\%}, respectively, whereas the values of the thixoformed heat-treated alloy with high Cu content (6{\%}) are 361 MPa, 274 MPa and 1.1{\%}, respectively. The fracture of the thixoformed Al-6Si-3Cu-0.3Mg alloy shows a dimple rupture, whereas in the alloy that contains the highest Cu content (6{\%}), a cleavage fracture is observed.",
keywords = "Al-Si-Cu-Mg alloy, Cu content, mechanical properties, T6 heat treatment, thixoforming",
author = "Salleh, {M. S.} and Omar, {Mohd. Zaidi}",
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AU - Salleh, M. S.

AU - Omar, Mohd. Zaidi

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N2 - The effects of Cu content on the microstructure and mechanical properties of thixoformed Al-6Si-xCu-0.3Mg (x= 3, 4, 5 and 6, mass fraction, %) alloys were studied. The samples were thixoformed at 50% liquid content and several of the samples were treated with the T6 heat treatment. The samples were then examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis, as well as hardness and tensile tests. The results show that the cooling slope casting and thixoforming process promote the formation of very fine and well distributed intermetallic compounds in the aluminium matrix and the mechanical properties of the alloys increase considerably compared with the permanent mould casting. The results also reveal that as the Cu content in the alloy increases, the hardness and tensile strength of the thixoformed alloys also increase. The ultimate tensile strength, yield strength and elongation to fracture of the thixoformed heat-treated Al-6Si-3Cu-0.3Mg alloy are 298 MPa, 201 MPa and 4.5%, respectively, whereas the values of the thixoformed heat-treated alloy with high Cu content (6%) are 361 MPa, 274 MPa and 1.1%, respectively. The fracture of the thixoformed Al-6Si-3Cu-0.3Mg alloy shows a dimple rupture, whereas in the alloy that contains the highest Cu content (6%), a cleavage fracture is observed.

AB - The effects of Cu content on the microstructure and mechanical properties of thixoformed Al-6Si-xCu-0.3Mg (x= 3, 4, 5 and 6, mass fraction, %) alloys were studied. The samples were thixoformed at 50% liquid content and several of the samples were treated with the T6 heat treatment. The samples were then examined by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis, as well as hardness and tensile tests. The results show that the cooling slope casting and thixoforming process promote the formation of very fine and well distributed intermetallic compounds in the aluminium matrix and the mechanical properties of the alloys increase considerably compared with the permanent mould casting. The results also reveal that as the Cu content in the alloy increases, the hardness and tensile strength of the thixoformed alloys also increase. The ultimate tensile strength, yield strength and elongation to fracture of the thixoformed heat-treated Al-6Si-3Cu-0.3Mg alloy are 298 MPa, 201 MPa and 4.5%, respectively, whereas the values of the thixoformed heat-treated alloy with high Cu content (6%) are 361 MPa, 274 MPa and 1.1%, respectively. The fracture of the thixoformed Al-6Si-3Cu-0.3Mg alloy shows a dimple rupture, whereas in the alloy that contains the highest Cu content (6%), a cleavage fracture is observed.

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