Formability Behavior of Brass Alloy Sheet:
the Role of Twins in Microstructure¹

Mohammad Tajally*, Esmaeil Emadoddin, and Ehsan Allah Shahi

Faculty of Materials Science and Metallurgy, Semnan University, Semnan, IRAN

*e-mail: m_tajally@profs.semnan.ac.ir

Abstract—Quantitative understanding of the process and formability parameters involved in grain size and the
formation of annealing twins after plastic straining is important in the control of the manufacturing process.
There is a synergistic effect of strain and temperature on the density of annealing twins. Formability of brass
alloy sheets was studied after annealing of 65% cold worked (CW) samples at different temperatures (300–
600C). Tensile, deep drawing and Erichsen tests were carried out at room temperature to evaluate formability
of alloy. Effect of annealing temperature on density, distribution and size of twins is investigated. It was shown
that annealing of brass alloy resulting in formation of annealing twins which at higher annealing temperature
were reduced by increasing grain size. Best deep drawability would be achieved by annealing at moderate tem-
perature 400–450C which microstructure consists of fine grain and twin bands. Work hardening exponent of
samples was calculated based on the tensile test data and correlated with stretch ability of annealed brass sheets.
It was found that the sheets annealed at 600C possess best ductility and high average n-value.

Keywords: brass alloy, deep drawing, annealing twin

DOI: 10.3103/S1067821214050162

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