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Geometry-Faithful Strain Normalization for Interface-Controlled Strengthening in Phase-Transforming Filamentary Composites
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DOI：10.1002/adem.71072.png)
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Abstract
En 中文
In deformation-processed composites, strength is governed by refinement of a codeforming second phase into a dense filamentary architecture that constrains plasticity through interfacial barriers. When a postdeformation phase transformation alters reinforcement volume and filament geometry at fixed macroscopic dimensions, nominal true strain no longer uniquely represents the operative interfacial length scale. Here, a geometry-faithful framework is introduced to restore a one-to-one mapping between deformation state and reinforcement length scale through an effective-strain normalization that accounts for transformation-induced filament expansion. The approach is demonstrated using a filamentary Al/Ca composite and its postdeformation converted Al/Al2Ca state, combining tensile testing, quantitative filament-thickness measurements, and barrier-type scaling. Normalization aids direct comparison at matched filament thickness (t ≈ 1.10–0.35 µm), enabling assessment of the geometry-normalized apparent interfacial barrier effect separately from chemistry-driven geometry changes. On a geometry-consistent basis, strength in both states follows an inverse-thickness dependence (∝1/t), consistent with interface-controlled dislocation glide, while the transformed state exhibits higher strengthening efficiency at high refinement, reaching ultimate tensile strength (UTS) = 365 MPa at t ≈ 0.35 µm (ηeff ≈ 12.7) with only a modest conductivity penalty (31.5 MS m−1, ≈10% relative to Al). Effective-strain normalization thus decouples deformation history from transformation-induced geometry evolution and provides a transferable basis for ranking reinforcement efficiency in postdeformation phase-transforming composites. The normalization is applicable when the reinforcement retains a continuous filamentary topology and transformation-induced expansion is approximately uniform; it becomes less reliable when filament breakup, spheroidization, or reaction gradients make filament thickness no longer representative of the operative barrier spacing.
Keywords:
aluminum intermetallic
effective-strain normalization
filamentary reinforcement
interface strengthening
metal matrix composites
strength–conductivity tradeoff
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