Storage of dislocations during plastic deformation of polycrystalline copper-manganese solid solutions
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ated to the memory of V.L. Indenbom
Storage of Dislocations during Plastic Deformation of Polycrystalline Copper–Manganese Solid Solutions É. V. Kozlov, L. I. Trishkina, and N. A. Koneva Tomsk State University of Architecture and Building, Tomsk, 634003 Russia email: [email protected] Received February 24, 2009
Abstract—The regularities of dislocation storage during the deformation of homogeneous polycrystalline solid solutions with different degrees of solidsolution hardening have been studied and described. The effect of alloy concentration and test temperature is considered. The role of different dislocation density compo nents (average scalar dislocation density, excess density, and dislocation density in walls and cells) is selected. Particular attention has been paid to the parameters of cellular substructure measured at different test tem peratures and alloying concentrations. The important role of the solidsolution hardening in the regularities of dislocation storage is established. PACS numbers: 81.05.Ea DOI: 10.1134/S1063774509060182
INTRODUCTION Vladimir L’vovich Indenbom was an outstanding person and profound researcher. He made a large con tribution to the development of the concepts of the dislocation mechanism of plastic deformation, guided research in this field, and looked after its for mation and scientific level in Russia. He was the first in Russia to introduce different components of the dislocation structure in order to analyze plastic ity [1]. This study reflects Indenbom’s approach to this problem [1, 2]. The first measurements of the dislocation den sity in deformed materials were carried out a long time ago [3]. Currently, not only the average scalar dislocation density but also some other parameters of the dislocation structure are measured [4, 5]. Dislocation structures are classified as high, medium, and lowenergy ones [6, 7]. The regular ities of dislocation storage in pure metals were gen eralized in reviews [8–10]. The dislocation storage in solid solutions differs from that in pure metals. This holds true for both ordered and disordered solid solutions [11]. However, there are few data on the dislocation storage in solid solutions, and they are not systematic. In view of the aforesaid, fcc Cu–Mn solid solutions are an interesting object of study. The manganese sol ubility in copper reaches 25–30 at % at low tempera tures (see the Cu–Mn diagram in [12]). The manga nese solubility in copper increases with an increase in the temperature. At low temperatures, according to some data, there is a limitation related to ordering. At
10 and 22 at % Mn, Cu5Mn and Cu3Mn phases, respectively, are formed [12]. At the same time, there is information that ordering is obtained upon slow cooling, and conventional annealed alloys exhibit a pronounced shortrange atomic order but lack long range order [13]. Therefore, one can study the effect of copper–manganese solid solution concentration on the dislocation storage regularities, at least up to the Cu–20 at % Mn composition. This is
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