Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee 247667, Uttarakhand, India


The microstructural evolution and mechanical properties of cast brass (Cu-10% Zn) subjected to cumulative strains of 3.0, 5.4 and 7.2 through multiaxial forging (MAF) at cryogenic temperature (77 K) were investigated. The mechanical properties of the homogenized and MAF treated alloy were measured through Vickers hardness testing. The brass deformed up to a cumulative strain of 7.2 showed improvement in the hardness of 2.3 GPa as compared with the as-homogenized annealed (0.55 GPa) alloy. The microstructural evolutions of cryoforged samples were characterized by optical microscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM) and X-Ray diffraction (XRD). Thereby, it helps to increase twining activity for further deformation. TEM and AFM investigations confirmed that the formation of subgrains as well as nanotwins is responsible for the improvement of the mechanical properties. Copyright © 2018 VBRI Press.


1.Valie,R.Z;Islamgaliev, R. K;Alexandrov, I. V; Prog. Mater. Sci.,
2.Dieter, G. E; Mechanical metallurgy, 3rd ed. McGraw-Hill, 1988, 1.

3.Wang, Y; Chen, M; Zhou, F; Ma, E; Nature, 2002,419,912.

4.Kobayashi, C; Sakai, T; Belyakov, A; Miura, H; Philos.Mag.
Lett., 2007,87,751.

Belyakov; Miura,H; Sakai, T; Mater. Trans.,2000,41,476.
6.Bay, B; Hansen, N; Hughes, D. A;Kuhlmann-Wilsdorf, D; Acta
Metall. Mater., 1992,40,205-219.

7.Venugopal; Prasad, R; Murty, B. S; Acta Mater., 2007,55,4439.

8.Ungar; Scr. Mater. 2004,51,777.

9.Rao, P. N; Singh, D; Jayaganthan, R; Mater. Des., 2014,56,

Wang, Z. C; Prangnell, P. B; Mater. Sci. Eng. A, 2002,328,87.
11.Zhao, Y. H; Zhu, Y. T; Liao, X. Z; Horita, Z; Langdon, T. G;
Appl. Phys. Lett.,2006,89,121906.