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Background <p>Room-temperature mechanical behavior of bulk quasicrystal alloys remains insufficiently understood because extreme brittleness and fabrication difficulties have limited systematic studies of strain-rate-dependent failure mechanisms.</p> Objective <p>This study aims to clarify how strain rate governs the compressive strength and failure mechanisms of a thermodynamically stable, single-phase Al₆₃Cu₂₅Fe₁₂ quasicrystal alloy and to establish a mechanism-informed failure model valid across loading rates.</p> Methods <p>Bulk single-phase Al₆₃Cu₂₅Fe₁₂ was fabricated using rapid hot pressing sintering to overcome processing constraints associated with quasicrystals. Uniaxial compression tests were performed over a range of strain rates, and the associated failure characteristics were analyzed by linking macroscopic responses to micro-mechanistic signatures. A physically based failure model was developed to incorporate the strain-rate-dependent transition in dominant failure mode.</p> Results <p>The compressive strength exhibits a nonmonotonic dependence on strain rate, indicating a switch in controlling damage mechanisms. Under quasi-static loading, grain-boundary defect initiation and propagation dominate, reducing strength. Under dynamic loading, dislocation-mediated slipping becomes prevalent, leading to an abrupt increase in compressive strength. The proposed model captures these rate-dependent trends and the underlying mechanism transition.</p> Conclusions <p>Strain rate dictates a clear shift from grain-boundary-controlled degradation to dislocation-dominated failure in Al₆₃Cu₂₅Fe₁₂, enabling improved interpretation and prediction of quasicrystal alloy mechanical performance.</p>

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Mechanical Properties and Failure Mechanisms of Al63Cu25Fe12 Single-Phase Quasicrystal Alloy

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • M. Y. Su,
  • Z. J. Xu,
  • J. M. Li,
  • Y. Han,
  • C. Z. Fan,
  • A. Hu,
  • S. Gao,
  • Z. C. Cai,
  • F. L. Huang

摘要

Background

Room-temperature mechanical behavior of bulk quasicrystal alloys remains insufficiently understood because extreme brittleness and fabrication difficulties have limited systematic studies of strain-rate-dependent failure mechanisms.

Objective

This study aims to clarify how strain rate governs the compressive strength and failure mechanisms of a thermodynamically stable, single-phase Al₆₃Cu₂₅Fe₁₂ quasicrystal alloy and to establish a mechanism-informed failure model valid across loading rates.

Methods

Bulk single-phase Al₆₃Cu₂₅Fe₁₂ was fabricated using rapid hot pressing sintering to overcome processing constraints associated with quasicrystals. Uniaxial compression tests were performed over a range of strain rates, and the associated failure characteristics were analyzed by linking macroscopic responses to micro-mechanistic signatures. A physically based failure model was developed to incorporate the strain-rate-dependent transition in dominant failure mode.

Results

The compressive strength exhibits a nonmonotonic dependence on strain rate, indicating a switch in controlling damage mechanisms. Under quasi-static loading, grain-boundary defect initiation and propagation dominate, reducing strength. Under dynamic loading, dislocation-mediated slipping becomes prevalent, leading to an abrupt increase in compressive strength. The proposed model captures these rate-dependent trends and the underlying mechanism transition.

Conclusions

Strain rate dictates a clear shift from grain-boundary-controlled degradation to dislocation-dominated failure in Al₆₃Cu₂₅Fe₁₂, enabling improved interpretation and prediction of quasicrystal alloy mechanical performance.