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<p>The structure and mechanical properties of the Fe–28 at.% Al alloy produced from ground and unground elemental powders by hot forging were subjected to comparative analysis. Powder grinding was found to be advisable in direct powder forging processes. After forging at 1100°C, the samples from ground powders were nearly nonporous. Additional annealing at 1300°C promoted the removal of impurity segregations from interparticle boundaries and led to fine oxide particles, contributing to precipitation strengthening. Following thermomechanical treatment, the low-temperature strength and fracture toughness of the samples from ground powders were approximately 30% higher than those from unground powders. This was attributed to the reduction in the effective grain size and the specific lamellar structure, which inhibits crack propagation. Importantly, the lamellas showed no tendency toward delamination along their length. Compression tests over the range 20–700°C demonstrated a significant increase in the yield stress at all temperatures, which is explained by grain refinement and the strengthening effect of second-phase particles. Specifically, at 700°C, the yield stress of the samples from ground powders was σ<sub>0.2</sub> = = 259 MPa, exceeding that of the samples from unground powders. The steady-state creep rate at 650°C under a load of 120 MPa in the samples from ground powders was approximately half that of the samples from unground powders and one-fourth that of the sintered samples.</p>

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Effect of Structural Refinement on the Mechanical Properties of Fe–28 Al Intermetallic Alloy Produced by Direct Powder Forging II. Influence of Powder Grinding on the Structurization and Mechanical Behavior of Fe–28 Al Iron Aluminide Over a Wide Temperature Range

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • O. I. Tolochyn,
  • O. V. Tolochyna,
  • G. A. Bagliuk,
  • Ya.I. Yevych,
  • M. I. Danylenko,
  • I. Yu. Okun,
  • Yu.M. Podrezov

摘要

The structure and mechanical properties of the Fe–28 at.% Al alloy produced from ground and unground elemental powders by hot forging were subjected to comparative analysis. Powder grinding was found to be advisable in direct powder forging processes. After forging at 1100°C, the samples from ground powders were nearly nonporous. Additional annealing at 1300°C promoted the removal of impurity segregations from interparticle boundaries and led to fine oxide particles, contributing to precipitation strengthening. Following thermomechanical treatment, the low-temperature strength and fracture toughness of the samples from ground powders were approximately 30% higher than those from unground powders. This was attributed to the reduction in the effective grain size and the specific lamellar structure, which inhibits crack propagation. Importantly, the lamellas showed no tendency toward delamination along their length. Compression tests over the range 20–700°C demonstrated a significant increase in the yield stress at all temperatures, which is explained by grain refinement and the strengthening effect of second-phase particles. Specifically, at 700°C, the yield stress of the samples from ground powders was σ0.2 = = 259 MPa, exceeding that of the samples from unground powders. The steady-state creep rate at 650°C under a load of 120 MPa in the samples from ground powders was approximately half that of the samples from unground powders and one-fourth that of the sintered samples.