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Research Papers

Investigating the Relationships Between Structures and Properties of Al Alloys Incorporated With Ti and Mg Inclusions

[+] Author and Article Information
Halil Ibrahim Kurt

Technical Sciences,
Gaziantep University,
Gaziantep 27310, Turkey
e-mail: hiakurt@gmail.com

Ibrahim H. Guzelbey

Department of Mechanical Engineering,
Gaziantep University,
Gaziantep 27310, Turkey

Serdar Salman

Department of Metallurgical and
Materials Engineering,
Marmara University,
İstanbul 34722, Turkey

Razamzan Asmatulu

Department of Mechanical Engineering,
Wichita State University,
Wichita, KS 67260

Mustafa Dere

Technical Sciences,
Gaziantep University,
Gaziantep 27310, Turkey

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received July 23, 2015; final manuscript received January 11, 2016; published online May 10, 2016. Assoc. Editor: Curt Bronkhorst.

J. Eng. Mater. Technol 138(3), 031006 (May 10, 2016) (6 pages) Paper No: MATS-15-1169; doi: 10.1115/1.4032849 History: Received July 23, 2015; Revised January 07, 2016

This study investigates the influence of titanium (Ti) and magnesium (Mg) additions on aluminum (Al) alloys in order to evaluate the relationship between the structure and properties of the new alloys. The alloys obtained at elevated temperatures mainly consist of Al–2Mg–1Ti, Al–2Mg–3Ti, Al–4Mg–2Ti, and Al–6Mg–2Ti alloys, as well as α and τ solid solution phases of intermetallic structures. Microstructural analyses were performed using X-ray diffraction (XRD), optical microscope, and energy dispersive spectrometry (EDS) techniques. Test results show that the average grain size of the alloys decreased with the addition of Ti inclusions during the casting and solidification processes, and the smallest grain size was found to be 90 μm for the Al–6Mg–3Ti alloy. In addition, tensile properties of the Al–Mg–Ti alloys were initially improved and then worsened after the addition of higher concentrations of Ti. The highest tensile and hardness values of the alloys were Al–4Mg–2Ti (205 MPa) and Al–6Mg–3Ti (80 BHN). The primary reasons for having higher mechanical properties may be attributed to strengthening of the solid solution and refinement of the grain size and shape during the solidification process. For this study, the optimum concentrations of Ti and Mg added to the Al alloys were 4 and 2 wt.%, respectively. This study may be useful for field researchers to develop new classes of Al alloys for various industrial applications.

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Figures

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Fig. 1

XRD patterns of (a) Al–2Mg–1Ti, (b) Al–2Mg–3Ti, (c) Al–4Mg–2Ti, and (d) Al–6Mg–2Ti alloys for structural characterization

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Fig. 2

Al–Mg–Ti phase diagram representing composition of elements and phases

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Fig. 3

SEM (a) and (c) and optical microscopy (b) and (d) images of Al–2Mg–1Ti and Al–2Mg–3Ti alloys and their EDS spectrums (f) and (g) of points 1 and 2 spots

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Fig. 4

SEM images (a) and (c) and elemental mapping images (b) and (d) of Al–4Mg–2Ti and Al–6Mg–2Ti alloys

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Fig. 5

Variation of average grain size of Al–Mg alloys with different Ti concentrations

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Fig. 6

Variation of Brinell hardness values of Al–Mg alloys with different Ti concentrations

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