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Effects of Cu on the microstructures and tensile properties of thixoformed Al-Si alloys

Salleh, Mohd Shukor and Omar, Mohd Zaidi and Syarif, Junaidi and Alhawari, Khalid Salim and Mohammed, Mohamad Naser (2015) Effects of Cu on the microstructures and tensile properties of thixoformed Al-Si alloys. Solid State Phenomena. pp. 91-98. ISSN 1662-9779

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Abstract

In this study, the effects of copper content on the microstructures and tensile properties of thixoformed Al-5Si-xCu-0.5Fe (x =1.0, 2.0 and 3.0wt. %) were investigated. For this study, three different alloys having various amounts of copper were prepared using cooling slope casting before thixoforming. The semi-solid liquid range for the alloys were estimated using the diffrential scanning calorimetry (DSC) analysis. The samples were thixoformed at 40% liquid fraction. Some of these samples were treated with a T6 aging process. The thixoformed and thixoformed T6 samples were then characterized by optical microscopy, scanning electron microscope (SEM) and energy dispersive X-ray (EDX) as well as tensile tests. The different phases formed in the thixoformed and thixoformed T6 samples were throughly investigated.The results indicate that as copper content increases, the tensile strength also increases, which might due to precipitation hardening. The thixoformed T6 alloys attained an ultimate tensile strength (UTS) as high as 303 MPa when Cu content is 3.0wt.%.

Item Type: Article
Uncontrolled Keywords: Al-5Si-xCu-0.5Fe alloys, cooling slope, thixoforming, T6 heat treatment, tensile properties
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Manufacturing Engineering > Department of Manufacturing Process
Depositing User: Dr MOHD SHUKOR SALLEH
Date Deposited: 30 Mar 2015 07:07
Last Modified: 28 May 2015 04:37
URI: http://eprints.utem.edu.my/id/eprint/14312

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