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Research Papers

Anisotropic Strain-Hardening Behavior of Mg–5%Sn–1%Ca Alloy Sheet at Elevated Temperatures

[+] Author and Article Information
G. H. Hasani

School of Metallurgical
and Materials Engineering,
College of Engineering,
University of Tehran,
Tehran 11155-4563, Iran

R. Mahmudi

School of Metallurgical
and Materials Engineering,
College of Engineering,
University of Tehran,
Tehran 11155-4563, Iran
e-mail: mahmudi@ut.ac.ir

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received July 17, 2013; final manuscript received August 8, 2014; published online August 28, 2014. Assoc. Editor: Irene Beyerlein.

J. Eng. Mater. Technol 136(4), 041005 (Aug 28, 2014) (7 pages) Paper No: MATS-13-1116; doi: 10.1115/1.4028256 History: Received July 17, 2013; Revised August 08, 2014

Anisotropic strain-hardening behavior of the TX51 (Mg–5Sn–1Ca) magnesium alloy sheets was investigated in the temperature range of 25–300 °C and at an initial strain rate of 5 × 10−4 s−1. Tensile tests were carried out with the loading axis oriented at 0 deg, 45 deg, and 90 deg to the rolling direction (RD) to explore the effects of temperature on the anisotropic strain-hardening behavior of the sheets after hot rolling and annealing. The anisotropic strain-hardening behavior of the TX51 sheet was due to the crystallographic texture as well as mechanical fibering of the microstructure. The former was manifested by the development of a relatively sharp basal {0001} texture, and the latter was caused by alignment in the RD of CaMgSn coarse particles. Kocks–Mecking type plots showed stage III and stage IV strain-hardening behavior at all test temperatures. The directionality of flow stress and initial strain-hardening rates in stage III were discussed based on the Schmid factors of material.

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Figures

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Fig. 1

(a) Optical, (b) SEM, and (c) higher magnification SEM microstructure of the hot rolled and annealed sheet

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Fig. 2

XRD pattern of the hot rolled and annealed material

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Fig. 3

(a) Stress–strain curves of the sheets tested in the RD and TD at various temperatures, and (b) ultimate tensile strength in the 0, 45, and 90 deg as a function of test temperature

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Fig. 4

Comparison of (a) yield stress and (b) ultimate tensile strength of the TX51 and AZ31 magnesium alloys at various temperatures

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Fig. 5

(a) {0002}, (b) {101¯1} pole figures, and (c) ODF plot of hot rolled and annealed sheet

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Fig. 6

Strain-hardening rate (Θ) as a function of net flow stress (σ − σo) at: (a) room temperature, (b) 150 °C, (c) 250 °C, and (d) 350 °C

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Fig. 7

Initial strain-hardening rate (Θo) of the samples with different orientations as a function of test temperature

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