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<p>It is well known that solute atoms segregate to defects such as dislocations and stacking faults and this segregation can affect the deformation behavior of materials. In this paper, we use MD-MC simulations to evaluate the relative contribution of segregation to line and planar defects (Cottrell and Suzuki effects, respectively) in systems in which both exist. Hence, we have chosen commercially pure copper (Cu) and Cu–8&#xa0;wt&#xa0;pct Al (Cu8Al) alloy to study the effect of segregation. The stacking fault energy of Cu8Al is an order of magnitude less than pure copper, and hence a higher density of stacking faults is expected in deformed Cu8Al. We probe the deformation behavior in these systems through tensile tests that were interrupted at intervals of 0.2 strain with various delays (from 0 (no delay) to 120 minutes) between unloading and reloading. The interrupted tests show higher flow stress as compared to the uninterrupted tests, and the quantum of increase in flow stress increases with delay time; suggesting that the well-known Cottrell or Suzuki effects may play a role in the observed increase in flow stress. In order to investigate the effect of segregation and its relative contribution to the flow stress, we performed combined Molecular Dynamics (MD) and Monte Carlo (MC) simulations of the deformation of Cu and Cu8Al samples. Through a quantitative analysis of the simulation data, and measurements of segregation around dislocations and stacking faults, we show that Cottrell effect is the dominant mode of strengthening in both Cu and Cu8Al. The proposed methodology is generic and can be applied to any solid solution to evaluate the strengthening from dislocations and planar defects.</p> Graphical Abstract <p></p>

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Effect of Solute Segregation (Cottrell and Suzuki) on Deformation Behavior

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Sandhya Verma,
  • Sushil Kumar,
  • M. P. Gururajan,
  • Prita Pant

摘要

It is well known that solute atoms segregate to defects such as dislocations and stacking faults and this segregation can affect the deformation behavior of materials. In this paper, we use MD-MC simulations to evaluate the relative contribution of segregation to line and planar defects (Cottrell and Suzuki effects, respectively) in systems in which both exist. Hence, we have chosen commercially pure copper (Cu) and Cu–8 wt pct Al (Cu8Al) alloy to study the effect of segregation. The stacking fault energy of Cu8Al is an order of magnitude less than pure copper, and hence a higher density of stacking faults is expected in deformed Cu8Al. We probe the deformation behavior in these systems through tensile tests that were interrupted at intervals of 0.2 strain with various delays (from 0 (no delay) to 120 minutes) between unloading and reloading. The interrupted tests show higher flow stress as compared to the uninterrupted tests, and the quantum of increase in flow stress increases with delay time; suggesting that the well-known Cottrell or Suzuki effects may play a role in the observed increase in flow stress. In order to investigate the effect of segregation and its relative contribution to the flow stress, we performed combined Molecular Dynamics (MD) and Monte Carlo (MC) simulations of the deformation of Cu and Cu8Al samples. Through a quantitative analysis of the simulation data, and measurements of segregation around dislocations and stacking faults, we show that Cottrell effect is the dominant mode of strengthening in both Cu and Cu8Al. The proposed methodology is generic and can be applied to any solid solution to evaluate the strengthening from dislocations and planar defects.

Graphical Abstract