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Amorphization driven by defect-induced mechanical instability.

Chao Jiang1, Ming-Jie Zheng, Dane Morgan

  • 1Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, USA.

Physical Review Letters
|October 29, 2013
PubMed
Summary
This summary is machine-generated.

Silicon carbide (SiC) amorphizes due to defect accumulation, unlike zirconium carbide (ZrC). This study reveals defect-induced mechanical instability drives SiC amorphization under electron irradiation.

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Area of Science:

  • Materials Science
  • Computational Materials Science
  • Solid State Physics

Background:

  • Understanding material behavior under irradiation is crucial for nuclear and space applications.
  • Carbide materials like SiC and ZrC are candidates for high-temperature and high-radiation environments.
  • Defect accumulation can lead to material degradation and amorphization.

Purpose of the Study:

  • To comparatively study defect accumulation in silicon carbide (SiC) and zirconium carbide (ZrC) using ab initio molecular dynamics.
  • To investigate the mechanisms of amorphization in SiC and structural stability in ZrC under electron irradiation.
  • To identify the critical factors influencing the radiation response of these materials.

Main Methods:

  • Ab initio molecular dynamics (AIMD) simulations were employed.
  • Simulations focused on defect accumulation via Frenkel pair (FP) introduction in the Si and C sublattices.
  • Structural stability was assessed using pair correlation functions and analysis of long-range order.

Main Results:

  • SiC's fcc Si sublattice amorphized above a critical dose (~0.33 dpa) due to C Frenkel pair accumulation, losing long-range order.
  • ZrC's fcc Zr sublattice remained structurally stable up to 1.0 dpa, showing no signs of amorphization from C sublattice displacements.
  • The differing responses suggest distinct defect accumulation and stabilization mechanisms in SiC and ZrC.

Conclusions:

  • Defect-induced mechanical instability is proposed as the primary mechanism for SiC amorphization under electron irradiation.
  • ZrC exhibits superior radiation resistance to amorphization compared to SiC under similar C Frenkel pair accumulation conditions.
  • The findings highlight the importance of sublattice stability in determining the radiation tolerance of ceramic materials.